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10GBASE-T – Will It be the Best Media Options for 10G Data Center?

Ratified in 2006, 10GBASE-T is the standard to provide 10Gbqs connections over balanced twisted-pair copper, including Category 6A unshielded and shielded cabling. It provides great flexibility in network design due to its 100-meter reach capability. An immediate use for 10GBASE-T is to build the data center access-layer network that connects servers to access switches. But is it the best options for 10G data center? Understanding this requires an examination of the pros and cons of current 10GbE media options.

10GBASE-CX4
10GBASE-CX4 was the first favorite for 10GbE deployments, however its adoption was limited by the bulky and expensive cables, and its reach is limited to 15 meters. The large size of the CX4 connector prohibited higher switch densities required for large scale deployment. Larger diameter cables like 10GBASE-CX4 are purchased in fixed lengths resulting in challenges to manage cable slack. As a result, pathways and spaces may not be sufficient to handle this larger cable.

SFP+ 
SFP+’s support for both fiber optic cables and DAC which makes it a better solution than CX4. SFP+ is commonly used for 10G today, but it has limitations that will prevent itself from moving to every server. The following image shows a SFP+ nodule, SFP+ DAC cable and a 10GBASE-T SFP+ port media converter.

media options for 10G data center

10GBASE-SR—10GBASE-SR (SFP+ fiber) fiber is great for its low latency and longer distance (up to 300 meters), but it is expensive. SFP+ fiber offers low power consumption, but the cost of laying fiber networking everywhere in the data center is prohibitive. The SFP+ fiber electronics can be four to five times more expensive than their copper counterparts, meaning that ongoing active maintenance, typically based on original equipment purchase price, is much more expensive. In addition, replacing a copper connection that is readily available in a server to fiber creates the need to purchase not only the fiber switch port, but also a fiber NIC for the server. EX-SFP-10GE-SR is compatible Juniper SFP+ transceiver that requires a OM3 cable to realize its 10G connectivity, which is an indispensable component for a 10G network.

10GBASE-SFP+ DAC—DAC is a lower cost alternative to fiber, but it can only reach 7 meters and it is not backward-compatible with existing GbE switches. Take MA-CBL-TA-1M as an example, it is designed to cover a distance of 1m for 10G connectivity. The DAC cables are much more expensive than structured copper channels, and cannot be field terminated. This makes DAC more expensive than 10GBASE-T. The adoption rate of DAC will be low since it does not have the flexibility and reach of 10GBASE-T.

10GBASE-T
The major benefit of 10GBASE-T is that it offers the most flexibility, the lowest cost media, and is backward-compatible with existing 1GbE networks. Like all BASE-T implementations, 10GBASE-T covers a lengths up to 100 meters, which gives network designers a far greater level of flexibility in connecting devices in the data center and the most flexibility in server placement since it will work with existing structured cabling systems. For higher grade cabling plants (category 6A and above), 10GBASE-T operates in low power mode on channels under 30 m. This means a further power savings per port over the longer 100m mode. And because 10GBASE-T is backward-compatible with 1000BASE-T, it can be deployed in existing 1GbE switch infrastructures in data centers that are cabled with CAT6 and CAT6A (or above) cabling, enabling network designers to keep costs down while offering an easy migration path to 10GbE.

One challenge with 10GBASE-T is that the early physical layer interface chips (PHYs) consumed too much power for widespread adoption. But there comes a good news with 10GBASE-T is that the PHYs benefit greatly from the latest manufacturing processes. The newer process technologies will reduce both the power and cost of the latest 10GBASE-T PHYs. The latest 10GBASE-T adapters require only 10 W per port. Further improvements will reduce power even more. In 2011, power dropped below 6 W per port, making 10GBASE-T suitable for motherboard integration and high-density switches.

Conclusion
Of all the media options offered above, 10GBASE-T breaks through important cost and power consumption barriers in 10GbE deployment as well as its backwards compatibility with 1GbE networks. Deployment on 10GBASE-T will simplify data center infrastructures, making it easier to manage server connectivity while delivering the bandwidth needed for heavily virtualized servers and I/O-intensive applications. I must say, 10GBASE-T will be the best option for 10GbE data center cabling in the near future.

Laser-optimized Multimode Fiber – OM3 and OM4

How do I determine the type of fiber needed for my campus backbone? This is the question routinely asked by network designers. I must say, with many cabling options available in the market, it is a huge project to deploy a Gigabit Ethernet network—10GbE or 40/100GbE. As system engineers should not only decide which fiber type and the cabling infrastructure is perfect for their network, but the fiber counts. This article will briefly analyze the benefits of using laser-optimized 50µm multimode fiber in a Gigabit Ethernet application.

50µm Multimode Fibers Were Introduced 
Before the advent of Gigabit Ethernet, choosing fiber type in a network design was quite easy. Standard 62.5µm multimode fiber (OM1) was used for any application up to 2000 m and network speeds up to 622 Mbps and single-mode fiber was used for anything else. But Gigabit and 10GbE changed these rules. Laser-optimized 50µm multimode fiber (like OM3 and OM4) was developed with increased bandwidth performance for 10GbE, and the fiber performance was included in the ANSI/TIA-568 Standard. Figure 1 provides a vivid impression on 50µm and 62.5µm multimode fiber.


Multimode fiber


Why Consider 50 µm Over 62.5 µm?
The major difference between 50µm and 62.5µm multimode fiber is the bandwidth. 50µm fiber is specifically designed to produce higher bandwidth values than 62.5µm at 850 nm, which enables the fiber to be used with lower cost 850nm VCSEL transmitters. Standard 50µm fiber has three times the bandwidth of standard 62.5µm fiber in the short wavelength operating window while some of the never laser-based 50µm fiber designs have 10-20 times the bandwidth of standard 62.5µm fiber (see in Figure 2). The most commonly used 50µm fibers on the market for Gigabit Ethernet is OM3 and OM4.


difference between 50µm Over 62.5µm


OM3 and OM4 Fibers
OM3 and OM4 fibers are essential components to the success of 10G optical connectivity, which are optimized for laser-based 850nm operation and have a minimum 2000 MHz•km and 4700 MHz•km effective modal bandwidth, respectively. 10G operation is supported on OM3 to 300 m and OM4 to 550 m compared to 100 m with CAT 6A copper cable. The laser-optimized fibers provide a migration path for supporting even higher data rates such as 16G and 32G Fibre Channel and 40/100G Ethernet where CAT 6/6A has no migration beyond 10G. OM3/OM4 laser-optimized 50µm multimode fiber for 10G optical connectivity in data center enables better transmission distance and performance when comparing with OM1 and OM2 fibers. For example, GP-10GSFP-1S is compatible Dell Force10 10GBASE-SR SFP+ transceiver. It required an OM3 cable to realize the link length of 300m.

As increased bandwidth requirements are called out in new installations, which have dictated a need to transition from cost-effective multimode systems to more costly single-mode systems to solve the problem of limited transmission distance in the existing infrastructure. However, compared with the expensive single-mode cabling, OM4 effectively provides an additional layer of performance that supports these applications at longer distances, thereby limiting the number of installations that truly require OS2 single-mode fiber. OM4 can even provide a minimum reach of 125m over multimode fiber within the 40 and 100GbE standards. For example, FTL410QE2C (compatible Finisar 40GBASE-SR4 QSFP+) covers a distance of 150m over OM4 cable.

Conclusion
When determining fiber types for a network application, a couple of key points should be drawn to help make the best decision. First, use the standards of each technology, do some analysis, understand the physical topology and the logical topology, then examine where you can save money. Last but not least, for distances less than 550 m, a laser-optimized multimode fiber may yield a price savings compared to a single-mode solution. Fiberstore provides a full range of multimode fibers including OM1, OM2, OM3 and OM4 multimode fibers. We offer these cables at a minimum price but with high quality. If you have any requirement of our products, please contact us directly.

Publicerat klockan 04:28, den 2 mars 2016
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Introduction to 10G SFP+ Twinax Cabling

Driven by the never-ending requirement for faster data-rate transmission, Ethernet technology has continually evolved from 1GbE to 10GbE and eventually to 100GbE. This demand for faster application speed has also spurred technological evolution on data carrying techniques. Consequently, fiber and copper transmission standards has been progressed, providing greater bandwidth for transporting data over Ethernet architectures with reduced cost and complexity. In today’s article, some detailed information will be provided on 10G SFP+ twinax cabling.

Why Implementing 10G SFP+ Twinax Cabling?
Many research companies forecast that 2016 will be the year of 100G. So why implementing 10G twinax cabling here? There are several reasons which will help you sort this out. Regardless of cost, most LAN infrastructures employ a mixture of copper and fiber premises wiring. 10GbE bandwidth are generally sufficient to support the transfer and streaming of large data, video and audio files. Thus there are no demands for greater network performance or application bandwidth. What’s more, costs associated with re-cabling a network can be exorbitant and organizations should take precautions to ensure their cabling systems can last well into the future. 10GbE twinax cabling provides the best assurance for being able to support forthcoming technologies and delivers utmost investment protection.

What Is 10G SFP+ Twinaxial Direct Attach Cable?
SFP+ Direct Attach Cable (DAC) is a copper 10G Ethernet cable which comes in either an active or passive twinax cable. The difference between them is that an active twinax cable has active electronic components in the SFP+ housing to improve the signal quality while a passive twinax cable is just a straight "wire" and contains few components. As such, they support different transmission distance. SFP+ DAC cables use SFP+ MSA and copper “twinaxial” cable with SFP+ connectors on both sides providing 10 Gigabit Ethernet connectivity between devices with SFP+ interfaces, which is expected to be the optimum solution for 10G Ethernet reaches up to 10 m.

Passive SFP+ Cable Assemblies
The passive SFP+ twinax cable is designed to support connections for 10 Gigabit Ethernet or Gigabit Ethernet switches with 10 Gigabit Ethernet uplink. Passive SFP+ cables, as noted before, have no electrical components and typical cover a distance of 1m, 3m, and 5m. For example, compatible Cisco SFP+ cables from Fiberstore like SFP-H10GB-CU3M, SFP-H10GB-CU1M, and MA-CBL-TA-1M, are programmed specifically to work with Cisco equipment. When these cables are plugged into Cisco equipment, they will not trigger the warning message that a non-Cisco transceiver has been detected. Figure 1 shows compatible Cisco SFP-H10GB-CU3M SFP+ to SFP+ passive copper cable with SFP+ connectors.

SFP+ Passive Copper Cable with SFP+ connectors

Active SFP+ Cable Assemblies
Active SFP+ twinax cables, compared with passive SFP+ cables can support longer transmission distance of 7m and 10m or up to 15m (distance may vary from vendors to vendors). For designs that only support SR and LR applications, active direct attach copper cable assemblies provide functions such as transmit disable and receiver loss of signal in addition to signal amplification, which makes it ideal for highly cost-effective networking connectivity between switches and servers. Figure 2 shows an active copper SFP+ DAC cable with SFP+ connectors.

SFP+ Active Copper Cable with SFP+ connectors

From these two pictures, we can see that there is no visual difference between active and passive SFP+ twinax cables. So, people should read the product specifications carefully before purchasing twinax cables.

Summary
SFP+ twinax cables offer a cost-effective way to interconnect 10G Ethernet devices within racks and across adjacent racks. These cables are usually accommodated into the SFP+ transceiver housing of a switch or server. Fiberstore SFP+ twinax DAC cables provide robust connections for leading edge 10GbE systems. We provide a full range of SFP+ DAC cables including SFP-H10GB-CU3M, SFP-H10GB-CU1M, EX-SFP-10GE-DAC-1M, JD097C, JD095C, etc. These SFP+ twinax cables are fully compatible with major brand. For more detailed information, please visit www.fs.com or contact us over sales@fs.com.

Publicerat klockan 04:03, den 26 februari 2016
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Structured Cabling or Unstructured Cabling Solutions

40G network has replaced 10G lately and used worldwide, under this circumstance, 40G equipment like 40G transceivers and QSFP+ cables are required. Plan the cabling system in advance is the prerequisites to the designing of network system. The goal is to address current network requirements as well as accommodate future growth. There are two types of cabling solutions for 40G—structured cabling and unstructured cabling. This article will mainly introduced these two cabling solutions to you.

What Is Structured Cabling?
Structured cabling specified by the EIA/TIA TR42 committee, is the standardized architecture and component for communication cabling. In a structured cabling system, a series of patch panels and trunks are used to create a structure that allows for hardware ports to be connected to a patch panel at the top of the rack (see in Figure 1). A structured cabling system provides a flexible cabling plan to address the commonly performed tasks of moving, adding, and changing the infrastructure as the network grows.

structured cabling

What Is Unstructured Cabling?
Unstructured cabling occurs when optical links are deployed point to point or device to device with no patch panels installed in the link. In this situation, cabling pathways become congested with an entangled mess of two-fiber optical patch cords (Figure 2). Likewise, routing new patch cords in ceiling or floor trays all the way across a data center each time a new device is deployed is extremely inefficient.

Unstructured cabling

Structured or Unstructured Cabling System
As noted before, the difference between structured and unstructured cabling lies in the installation of patch panels. A good analogy for this is the electrical wiring in your home. When connecting appliances and devices, you require only a 5-foot connection to the closest electrical outlet. However, without an electrical outlet, all appliances would have to connect directly to the breaker or panel, requiring a cable of 200 feet or more. This approach would be inefficient and would become unmanageable as you add multiple appliances and devices throughout the home.

Unstructured cabling like above point to point connectivity method can’t satisfy people’s needs any more. Because it may appear some mistakes in an unorganized messy cabling infrastructure. Remove a single cable from a large tangled mess can cause stress on the other cables. This stress can lead to network errors in the hardware that are very difficult to trace. Therefore, structured cabling becomes a necessity as the infrastructure grows and as constant moves and changes reinforce the need for a reliable network that is also easy to troubleshoot.

40G Structured Cabling Components
Laser-optimized multimode fiber, compared with single-mode fiber has proven itself to be the cost-effective cabling methods for high-data-rate system like 40GbE network, which has become the dominant fiber choice. Optimized for 850-nm VCSEL transceivers, these 50-micron fibers (especially OM3 and OM4) provide optimum technical and economic solution and become the dominant structured cabling options for today’s data centers. QSFP+ transceiver (typically with a 12-fiber MTP connector) is the dominant transceiver used for 40G applications. Other essential components for 40G structured cabling include MTP trunk cables, MTP-LC harness/breakout cables, LC or MTP patch cables, MTP-LC cassette modules, MTP adapter panels and MTP rack mount holders.

Conclusion
When deploying a network system, it is important to plan a cabling system in advance. Structured cabling uses fiber termination connector panels that are connected through permanent links of optical cabling, which is more popular than unstructured cabling. Fiberstore supplies a wide range of fiber optic transceivers and MTP/MPO assemblies such as MPO/MTP trunk cables, harness cables, cassette module and adapters. We also provide cost-effective 40G products including 40G QSFP and 40G cables. To satisfy your unique demands, we support custom or OEM service as well. For more information, please contact us directly

Reference:
http://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-series-switches/white-paper-c11-729908.html

How Transceiver Help Support Big Data

Optical transceiver market is growing rapidly and expected to be worth billion dollars. Network designers confirm that big data technology in data center is a major contributor to this growth. A transceiver, as a necessary component in data center can help executives to get their data in real-time, thus people can make immediate decisions. This is why it’s so important to be aware of how transceivers help to support big data.

Transceivers Are Supporting Big Data in Data Centers
Big data technology nowadays is the overwhelming trend because people can have access to data at all times and at everywhere. Greater bandwidth is necessary to support video and other types of data. Recently, 40GbE network has replaced 10G Ethernet network and has been used worldwide. 40GbE network is typically comprising of a pair of transceivers connected with cable. The transceivers, in turn, are plugged into either network servers or a variety of components including interface cards and switches. Transceivers are optical equipment in ensuring that the data is transmitted securely, expeditiously, and accurately across the fiber. To make sure the network capacity, optical transceivers, fiber patch cables, and switched are required to accomplish this goal. Take 40GbE network as an example, a 40G QSFP+ SR4 transceiver (QSFP-40G-SR4) needs a Type-B female MPO/MTP to female MPO/MTP cable to realize the 40G connectivity. Figure 1 shows two 40G QSFP+ SR4 transceivers connected by a MTP female cable.

two 40G QSFP+ SR4 transceivers connected by a MTP female cable

Transceivers Facilitate High Speed Data Transfers
By transmitting data at 10 Gbit/s or 40 Gbit/s, optical transceivers can facilitate high speed data transfers that can ensure that data arrives quickly. There are many types of transceivers and all are capable of handling fast transmission rates, such as SFP, SFP+, XFP, QSFP+, CFP, etc. But to tell the truth, each form factor has its unique usage and can support different bandwidth. Every organization that wants to achieve faster transmission times will choose to high quality transceivers for their designs. 40G QSFP is largely favored by designers as it can provide high-density 40G Ethernet. Optical transceivers that are capable of handling fast speeds can help with downloads and high and low bandwidth video transmission. If you’re a manager that needs to avert crisis immediately and you want to make a decision based upon real-time data, high-speed data transmissions speeds are necessary. Just remember to select the most suitable transceivers for your infrastructure.

Data Centers Benefit From The Use of Transceivers
Data centers are where companies store the barrage of data that comes from their offices. The information is usually stored in the cloud where employees and executives can access the information at any time they need. The data centers need to transmit data accurately, securely, and rapidly. Transceiver technology can facilitate the transmission process. This technology will help to fuel the growth by increasing the speed of data transmission across the fiber. Executives can make faster decisions and maintain a competitive advantage in the area.

Summary
Transceiver technology is just one component in the grand scheme of design related to big data, and there are other necessary components we shouldn’t neglect. But without transceivers, it would not be possible to transmit data at fast rates and over significant distances. Thus purchasing the right optical transceiver for your business is essential. Fiberstore, as a professional telecom manufacturer, offers a full range of optical transceivers, such as SFP+, X2, XENPAK, XFP, SFP, GBIC transceiver, CWDM/DWDM transceiver, 40G QSFP+ & CFP, WDM Bi-Directional transceiver and PON transceiver. If you have any needs of our products, please come to us. We will never let you down.

Publicerat klockan 04:54, den 20 februari 2016
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Multi-mode or Single-mode Optics for 40GbE Network

To back the changing and fast-growing bandwidth demands of data center, in 2010, the IEEE ratified 40 Gigabit and 100 Gigabit standards, known as IEEE 802.3ba. 40G and 100G Ethernet can be deployed using the same cabling systems today. Both single-mode (SMF) and multi-mode (OM3,OM4) were approved to be utilized in the standard. Multi-mode deploys parallel optics with MPO/MTP interconnects while single-mode fiber will employ serial transmission and use LC or SC connectors. Which cabling options designers should choose for their infrastructure. This article today will provide some practical suggestions to help you make a wise selection. Table 1 shows the comparison between SMF and MMF for 40/100 GbE Implementations.

table lists contrast between SMF and OM3,OM4

40GbE Over Multi-mode Fiber
40GbE and 100GbE over multi-mode optics use parallel optics at 10Gbps lasers, simultaneously transmitting across multiple fiber strands to achieve high data rates. Because of the multi-lane nature of these optics, 40GbE multi-mode optics use a different style of fiber cabling, known as MPO or MTP cabling. An MPO/MTP cable presents 12 separate strands of multi-mode fiber in a single ribbon cable. Just as 10GbE optics over multi-mode fiber, an OM3 or OM4 grade MMF is needed to cover longer distances for 40G network.

OM3 and OM4 MMF are laser-optimized fiber with a core size of 50/125 micron. These 50-micron fibers are optimized for the 850nm transmission of VCSEL-based transceivers. These two fibers have different bandwidths, which results in different achievable lengths for the same transceivers. OM4 fibers, according to the TIA-492AAAD, have higher network reliability and increased design flexibility allowing links with a reach of 150 meters. The IEEE 802.3ba standard specified OM3 fiber with a maximum reach of 100 meters. Take Cisco QSFP-40G-SR4 QSFP+ as an example, it can support a distance of 100m and 150m over OM3 and OM4, respectively. The following image shows a 40G-SR4 and 40GBASE-LR4 QSFP+.

two types of 40G QSFP+ module

Since we can deploy both OM3 and OM4 MMF for our 40G infrastructure, which one is more suitable? In fact, some senior engineers say that installing either OM3 or OM4 cabling in the data center largely depend on length requirements. They determined that OM4 fiber would substantially extend the reach of next generation networking within the data center and it is able to achieve this greater reach because of its greater EMB over OM3 fiber. OM4 optical fiber enables 40/100G Ethernet to reach an additional 60% of the links in the core-to-distribution and in the access-to-distribution channels when compared to OM3. This should lead to faster market acceptance of 40G/100G Ethernet and OM4 fiber.

40GbE Over Single-mode Fiber
40GBase-LR4 optics use the same multi-lane technology as SR4 optics using four strands for transmit and four strands for receive. But with one exception. Instead of using a single fiber strand for each lane, WDM technology is used to multiplex all four transmit lanes onto one strand of fiber and all four receive lanes onto another single strand of fiber, allowing any existing single-mode fiber installation to be used. Because of this, standard LC (for QSFP modules) or SC (for CFP modules) connections are used, allowing for an easy upgrade from a 10GbE connection. The channel cost for 40GBASE-LR4 is much higher than SR4 optics, which is the main factor that limits its popularity. However, 40GBASE-LR4 like Cisco QSFP-40G-LR4 can reach up to 10km.

Conclusion
After going through this article, do you have any idea of choosing which cabling for your 40G network. If you have tight budget and cover a short transmission distance, laser-optimized multi-mode cabling would be the prefect choice. But if you prefer to deploy a high-density long-reach network, single-mode cabling will suit you better. Fiberstore manufactures a large variety of 40G transceivers and cables. You can find what you need here. Please contact us if you are interested. 

Publicerat klockan 04:00, den 19 februari 2016
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40-Gbps Parallel and Bidirectional Transceiver

With speed in data center changing from 10- to 40-Gbps and eventually to 100-Gbps, mobile and virtualized workloads, cloud applications, big data and heterogeneous devices are all demanding previously unimagined capacity and performance from servers and data center fabric. High-capacity optical technology and cabling infrastructure are required to support those servers and applications for 40-Gbps upgrading. Today’s article will mainly introduce pluggable optical Enhanced Quad Small Form-Factor Pluggable (QSFP+) modules, especially Bidirectional and parallel QSFP+ transceivers.

Brief Introduction to Optical Transceiver
The transceiver is an electronic device comprising both a transmitter and a receiver in the same circuity. This optical transceiver receives an electrical signal, converts it into a light signal, and launches the signal into a fiber. It also receives the light signal, from another transceiver, and converts it into an electrical signal. It is commonly known as GBIC, SFP, SFP+, XFP, CFP and QSFP+. The QSFP+ transceiver is the dominant transceiver form factor used for 40 Gigabit Ethernet applications. In 2010 the IEEE standard 802.3ba released several 40-Gbps based solutions, including a 40GBASE-SR4 parallel optics solution for MMF (FTL410QE2C is compatible Finisar 40GBASE-SR4 QSFP+ MMF transceiver with a link length of 150m). Since then, several engineered solutions have been released, including 40GBASE-CSR4, which is similar to 40GBASE-SR4 but extends the distance capabilities. Another solution is a bidirectional 40-Gbps transceiver that uses a two-fiber LC optical interface.

Comparison of 40GBASE-SR4 Parallel Transceiver and Bidirectional Optical Transceivers 
Parallel optical transceivers differ from traditional fiber optic transceivers in data center is simultaneously transmitted and received over multiple fibers. Used for 40GBASE-SR4 and 40GBASE-CSR4, this transceiver has 10-Gbps electrical lanes that are mirrored in the optical outputs and thus require eight fibers with an MTP connector interface. Each fiber either transmits (Tx) or receives (Rx) 10-Gbps traffic at a single wavelength. Figure 1 shows the electrical and optical lanes diagram of 40GBASE-SR4 QSFP+ transceiver.

40GBASE-SR4 transceiver electical and optical interface

Bidirectional optical transceivers used for 40GBASE-SR-BD have the same 10-Gbps electrical lanes, which are then combined in the optical outputs, thus requiring two fibers with an LC connector interface. Each fiber simultaneously transmits and receives 20-Gbps traffic at two different wavelengths. Figure 2 shows a electrical and optical lanes diagram of bidirectional optical transceiver.

Bidirectional optical transceiver electical and optical interface

From the above images, we can easily see some differences between Bidirectional and parallel optical transceiver. This two-fiber 40-Gbps Bidirectional (BiDi) multimode solution uses two different transmission windows (850 nm and 900 nm) that are transmitted bidirectionally over the same fiber, which will allow the use of same cabling infrastructure for 40 Gigabit Ethernet as was used for 1 and 10G Ethernet application. While the parallel multimode optical transceiver operates at a wavelength of 850nm. In additional, the connector type was converted from the traditional 2-fiber LC duplex connector to a 12-fiber MTP connector.

Cabling Options for Parallel and Bidirectional Optical Modules
Choosing which type of fiber optical cable for your infrastructure is essential. As noted before, 40GBASE-SR4 multimode parallel optical transceiver uses eight fibers to transmit four duplex channels each at 10 Gigabit Ethernet. Parallel optical transceiver uses MTP 12-fiber trunk cable but only 8 of 12 fibers is used. There are several basic cabling options for parallel optics connectivity. I will generally introduce three solutions to you. One approach is to ignore the unused fibers and continue to deploy 12 fibers. Another approach is to use a conversion device to convert two 12-fiber links into three 8-fiber links. Figure 3 summarizes these three cabling solutions for 40G connectivity.

three cabling solutions for 40G connectivity.

As for the pluggable Bidirectional transceiver, it has the same QSFP+ format as the existing 40GBASE-SR4 transceiver. Therefore, the same switch line card with QSFP+ ports can support either parallel optics 40GBASE-SR4 or bidirectional optics 40GBASE-SR-BD solutions. Thus, when directly connecting a 40 Gigabit Ethernet bidirectional transceiver to another bidirectional transceiver, a Type A-to-B standard LC duplex patch cord can be used. This reverse fiber positioning allows a signal to be directed from the transmit position on one end of the network to the receive position on the other end of the network. However, this type of direct connectivity is suggested only within a given row of cabinets.

Conclusion
40-Gbps performance is no longer a myth, but a truth that has already facilitated people's daily life. When transitioning from 10 to 40 Gigabit Ethernet, extended 40 Gigabit Ethernet link distances, which match the distances at 10 Gigabit Ethernet, can be achieved by parallel optics transceivers. And as to 40 Gigabit Ethernet bidirectional transceivers, no changes to the cabling infrastructure are required, which is a huge cost saving. Fiberstore offers a large variety of 40-Gbps parallel optical transceivers that are fully compatible with major brand like Finisar QSFP+. For more detailed information about our devices, please contact us directly.

Reference:
http://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-series-switches/white-paper-c11-729908.html

Publicerat klockan 03:20, den 17 februari 2016
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Push-Pull or Pull-Pull Cables

Mechanical control cables features itself as weight-saving, more control throw, as well as no rod flex, which have had a positive impact on human life through their use in physical fitness equipment such as incline adjustments on treadmills and recreation by way of trim, steering and throttle controls for personal watercraft. There are two criteria—Push-Pull cable and Pull-Pull cable that are all available on the market. Do you think pull-pull works fine, or do you think push-pull is worth the extra weight? This article will discuss problems between them and provide some positive suggestions to you.

Advantages of Mechanical Control Cables
Mechanical control cables, compared with traditional cables, have the same components and internal-structure except a tab attached to the connector used for pushing or pulling the whole connector. They offer ease of installation as well as superior performance. Before going through the whole passage, I will use a vivid example to stress the importance of mechanical control cables. The following picture shows a push-pull patch cords with Pull tab connector.

push-pull-patch-cords

When a man went trough his bike, he noticed these push pull cables are rather important. If they were replaced with a different type of cable they would render useless. The gear cables that reach from the handle bars to the rear derailleur along with the front and rear brake cables are all push pull in operation. The push pull action allows the multiple wires to be wound tightly and be fixed on each end; this makes them flexible being able to transmit a push, pull, or turning movement. Therefore, when you pull the break lever the breaks are not stuck on or off, such was the case of my rusty cables. Bikes did not always have gears, but because of the invention of push pull cables bikes were able to have this attribute. All because of a few cables are we able to enjoy cycling without the trouble of worrying if we are able to stop or switch gears. Mechanical control cables are also favored for the feature of high flexibility, reliability and space-saving.

The Points of Differences That Matters Are:
Push-Pull and Pull-Pull cables belong to mechanical control cables. Push-Pull—where motion is applied in one direction by compression and in the opposite directions by tension. A Push-Pull patch cable is a very important form of control in the wire rope industry. These products are designed specifically to provide a system with mechanical motion that is both precise and positive transmission.

Pull-Pull—where motion is applied by tension and the control is returned to its original position by spring actuation. In most cases, Pull-Pull cable or Pull tab LC cable is more flexible and only able to provide single directional control, push-pull cables are able to offer multidirectional control, making them more valuable and desirable for many industries and applications.

The Right Cable for Your Network
In order to ensure that the control cables you purchase will be the best option for your upcoming project, various cable specifications should be taken into consideration including the length, maximum push and pull loads, thickness, number of bends, housing and materials used. It is advisable that you’d better discuss the specifications with a trusted and dependable manufacturer or supplier. They will know the exact steps to help you get the job done right.

Cables are the most commonly used devices in the telecom field. Choosing the right one will have great effect on your infrastructure. Fiberstore mechanical control cables are available in various mounting configurations, travel or stroke length, overall length and temperature options. As a professional manufacturer, we can custom thousands of different variations of cable in order to satisfy your needs. Push-Pull patch cable and Push-Pull MPO patch cord are also offered. If you are interested, please contact us directly.

Brief Comparison between QSFP-40G-LR4 and QSFP-40G-PLR4

Recently data center has gone through great migration from 1G, 10G to 40G, 100G over the past few years. IEEE 802.3ba standard ratified the 40G Ethernet on June 17, 2010. Since then several types of 40G optical transceivers were developed to achieve 40G network, of which QSFP is the most commonly used type available on the market. There are many different variants of 40G QSFP, like QSFP-40G-LR4 (in following picture), QSFP-40G-PLR4. What is the difference between them? This passage will provide a satisfying answer for you.

Cisco QSFP-40G-LR4

Difference Between These two Modules
The most obvious difference between QSFP-40G-LR4 and QSFP-40G-PLR4 is that QSFP-40G-PLR4 has a plus letter “P”. In fact, it means parallel. And In digital data transmission, data transmission usually occurs in two modes—serial and parallel. Parallel transmission is the simultaneous transmission of multiple bits over two or more separate paths, which allow for higher data transfer rates than can be achieved with serial transmission. While serial transmission is the sequential transmission of bits over a single wire frequency or optical path. It reduces the wire cost but slows the transmission speed at the same time. Thus QSFP-40G-LR4 uses the LC connector to achieve serial transmission. While QSFP-40G-PLR4 transceiver terminates with the MPO/MTP connectors to reach parallel transmission. Expect for different optical connectors, they are distinguished by the following features.

  • Wavelength

QSFP-40G-LR4 (Multiplexing and demultiplexing of the four wavelengths are managed within the device): 1271 nm, 1291 nm, 1311 nm, 1331 nm
QSFP-40G-PLR4: 4×1310nm

  • Transmission Distance

QSFP-40G-LR4 and QSFP-40G-PLR4 both support link lengths of up to 10km.

  • Interoperability

For QSFP-40G-LR4, the 40 Gigabit Ethernet signal is carried over four wavelengths. Multiplexing and demultiplexing of the four wavelengths are managed within the device, which interoperates with SFP+ CWDM.

For QSFP-40G-PLR4, it interoperates with 10GBASE-LR (10km) and 10G-LRL (1km) with 4×10G splitter option.

  • Cable Type

40GBASE-LR4 supports up to 10km on 9um SM fiber (same fiber used for 10G single mode 10GBASE-LR).
QSFP-40G-PLR4 can support 4 individual 10G-LR connections using a 4×10G mode and fiber breakout cables or cassettes for single mode fiber.

Additional Information
There are another two 40G transceiver modules that are similar to each other, that is 40GbE PLRL4 and 40GbE PLR4. 40GbE PLRL4 (The parallel LR4 Lite) supports distances of 1km on single mode fiber which is compatible with 10GBASE-LRL standard. In addition, the PLRL4 optic can support 4 individual 10G-LR connections using a 4x10G mode and fiber breakout cables or cassettes for single mode fiber. While 40GbE PLR4 (parallel LR4) is compatible with 10GBASE-LR and 10GBASE-LRL supporting distance of 10km (or 1km) on single mode fiber. In addition the PLR4 optic can also support 4 individual 10G-LR connections using a 4x10G mode and fiber breakout cables or cassettes for single mode fiber.

Conclusion
To sum up, QSFP-40G-LR4 and QSFP-40G-PLR4 are distinguished with each other in the above features as well as 40GbE PLRL4 and 40GbE PLR4. Fiberstore, a professional telecom manufacturer and supplier, offers a wide variety of high-density and low-power compatible 40G Ethernet optical transceivers including Avago QSFP+, Brocade QSFP+, Dell QSFP+ and HP QSFP+, etc. Fiberstore JG661A is compatible with HP QSFP-40G-LR4. They are very popular among users for its large stocks, competitive price and high quality. We can also customize optical products to meet your own requirements. If you are interested in our products, please send your inquiry to us.

Publicerat klockan 03:42, den 27 januari 2016
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Make Your Network Ready for 40GbE to the Server

In today’s server networks, 40GbE has become commonplace and has gradually taken over multiple 10GbE links to each server. Installation of 40GbE devices in the field will be a requirement for customer service and reduced operating costs. So are you ready for embracing 40GbE era? But how should the network prepare for delivering 40GbE to servers?

The core of the 40GbE networking, just like the 1GbE or 10GbE networks, is a pair of transceiver modules connected by optical patch cables. Thus the issue here is to pick the right 40GbE optical devices for your network server. 40G optical transceiver modules has several form factors—CFP (C form-factor pluggable) transceiver, CXP transceiver form factor and QSFP/QSFP+ (quad small-form-factor pluggable) transceiver. 40G QSFP modules recently gain more popularity on the market as a result of its small size and high performance. Thus selecting 40G QSFP modules is a cost-effective solution for your 40GbE network server.

A Quick Overview of QSFP Transceiver Modules
QSFP is a compact, hot-pluggable transceiver used to plug into network servers, interface cards or switches. It provides four transmit and four receive lanes to support 40GbE applications for multi-mode and single-mode fiber and copper today. A variety of QSFP transceivers are available on the market, such as QSFP-40G-CSR4, QSFP-40G-PLR4, 40GBASE-PLRL4, QSFP-40G-SR4, QSFP-40G-LR4, etc. Take QSFP-40G-ER4 (see in Figure 1) as an example, it is the compatible Cisco QSFP-40G-ER4 QSFP modules that extend the reach of the IEEE 40GBASE-ER4 interface to 40km on single-mode fiber.

QSFP-40G-ER4

DAC and AOC Cabling
The standards for 40GbE have been around for more than 2 years, and a number of routers, switches, and network cards have already operated at this speed. 40GbE cabling is also an important segment of upgrading your network. As we know that the most cost-effective cabling for both 10GbE and 40GbE is the direct attached cable (DAC) type based on twinaxial cabling. Such cables are based on copper and have transceivers directly connected to each end of the cable. 40GbE uses the slightly larger QSFP transceivers, which internally are made up of four 10Gbit/s lanes. DAC cables exist in lengths up to 10 meters, but the price increases substantially when the cables get longer than 3 to 5 meters. When longer runs of 10GbE or 40GbE than 10 meters are needed, fiber cabling and separate transceivers are the only option. Active optical cables can achieve high data center over long reaches. In addition to achieving longer reach, the lower weight and tighter bend radius of AOCs enable simpler cable management and the thinner cables allows better airflow for cooling. But the cost of each transceiver is usually several times that of one DAC cable. Constraints like that are important to take into account when designing a data center network. Figure 2 shows a compatible Cisco QSFP-4SFP10G-CU3M QSFP+ to 4SFP+ Passive Breakout Copper Cable.

QSFP-4SFP10G-CU3M

Prospect

  • 40 GbE will arrive for Top of Rack solutions in 2016.
  • Switches in the campus backbone and aggregation layers should be ready for replacement/upgrading in 2016 to support 40GbE.
  • Do not install any cabling in your data center or campus backbone. 40GbE uses 8 fiber cores for multi-mode and 1 pair for single mode. The cable will be OM4 although OM3 will have shorter distances. Provision the least amount of cable until new cabling solutions arrive.
  • Spending money on expensive 10GbE switches will be wasted as they are likely to be replaced in 2016 with 40GbE. Most server people are already deploying/asking for 4x10GbE per chassis and it probably be cheaper to use a 40GbE QSPF than four 10G SFP modules in two to three years time.

Summary
Believe it or not, the 40 Gigabit Ethernet era is already upon us. Therefore it is essential to make yourself well prepared for the incoming big data age. Over these years, Fiberstore has built a good reputation for uncompromising product quality, reliability and technical innovation. We offer a broadest portfolio of optical devices on the market today. For more detailed information, please contact us directly.

Publicerat klockan 03:37, den 23 januari 2016
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Make a Brief Contrast Between Cisco 40GBASE-LR4 QSFP+ Modules

With four times the capacity and the ability to cost-effectively migrate to 100GbE. 40GbE is regarded as the next logical step in the evolution of the data network. This increased speed will allow 40GbE-enabled equipment to handle traffic at the aggregation and core layers. Therefore, a large variety of 40GbE products including 40G QSFP+ and QSFP+ cables have been developed to support this new technology. This article will address some basic information about four 40GBASE-LR4 QSFP+ modules—QSFP-40GE-LR4, QSFP-40G-LR4, QSFP-40G-LR4-S and WSP-Q40GLR4L and the difference between them.

A Closer Look at Cisco 40GBASE-LR4 QSFP+ 
These four 40G QSFP+ modules are similar to each other. Customers might be mistaken if they don’t know how to differ them. In general, QSFP-40GE-LR4, QSFP-40G-LR4 and QSFP-40G-LR4-S are compatible with 40GBASE-LR4, yet WSP-Q40GLR4L are compatible with 40GBASE-LR4-Lite. They all operate over single-mode fiber with LC connectors. More detailed information will be displayed in the following part.

Cisco QSFP+

  • QSFP-40GE-LR4

QSFP-40GE-LR4 is Cisco 40GBASE-LR4 QSFP+ transceiver module, which is designed for single-mode fiber with duplex LC connector. QSFP-40GE-LR4 operates at a wavelength of 1310nm and supports link length of up to 10km.

  • QSFP-40G-LR4

This Cisco 40GBASE-LR4 QSFP module supports link lengths of up to 10km over a standard pair of G.652 single-mode fiber with duplex LC connectors. The 40 Gigabit Ethernet signal is carried over four wavelengths. Multiplexing and demultiplexing of the four wavelengths are managed within the device.

  • QSFP-40G-LR4-S

QSFP-40G-LR4-S is the Cisco 40GBASE-LR4 QSFP module supporting link lengths of up to 10 km over a standard pair of G.652 single-mode fiber with duplex LC connectors. The QSFP-40G-LR4-S belongs to Cisco S-class Optics that supports 40GBase Ethernet rate only. QSFP-40G-LR4-S does not support FCoE.

  • WSP-Q40GLR4L

This Cisco WSP-Q40GLR4L QSFP module supports link lengths of up to 2km over a standard pair of G.652 single-mode fiber (SMF) with duplex LC connectors. The 40 Gigabit Ethernet signal is carried over four wavelengths. It is interoperable with 40GBase-LR4. The operating temperature range is from +10 to +60°C with an optical link budget of 4 decibels. This 4-decibel link budget offers the ability to support the loss from patch panels in the link in a data center environment.

A Fair Contrast Between These Modules
Cisco QSFP-40GE-LR4 vs. Cisco QSFP-40G-LR4
Cisco QSFP-40GE-LR4, compared with Cisco QSFP-40G-LR4 has a plus letter “E”. What does it mean? According to the Cisco data sheet, QSFP-40GE-LR4 supports 40GBase Ethernet rate only, whereas the QSFP-40G-LR4 supports OTU3 data rate in addition to 40GBase Ethernet rate.

QSFP-40G-LR4-S vs. Other Transceivers
From the above description, we know that QSFP-40G-LR4-S is the Cisco S-class optics and others are non-S-Class optics. There are no obvious differences between S-class optics and non-S-Class optics on specification. But one thing is for sure that S-class optics is only for Ethernet protocol, not for OTN (Optical Transport Network) or WAN-PHY (Wide Area Network Physics). In addition S-class optics have different temperature ranges with non-S-class optics. Thus if you don’t have any special requirement, QSFP-40G-LR4-S are cheaper and should be just fine for you.

WSP-Q40GLR4L vs. Others
WSP-Q40GLR4L is compatible with 40GBASE-LR4-Lite. While the others are compatibles with 40GBASE-LR4 standard. 40GBASE-LR4 (long range) is a port type for single-mode fiber and uses 1300nm lasers. The pluggable QSFP+ 40GBASE-LR4-Lite product namely WSP-Q40GLR4L is aimed at data center applications with reduced environmental and operating requirements, and a limited 2km reach. Yet standard-compliant LR4 modules meet all the requirements and have a 10km reach.

Summary
These Cisco 40GBASE QSFP offers customers high-density and low-power 40 Gigabit Ethernet connectivity options for data center. QSFP-40GE-LR4, QSFP-40G-LR4, QSFP-40G-LR4-S and WSP-Q40GLR4L are similar but differ in small aspects, which requires designers to select the suitable one for their application. Fiberstore provides a variety of compatible Cisco QSFP+ modules that are well tested by our Test Assured Program. We aim at bringing the best optic devices to each customers. If you are interested in our products, please contact us directly.

Publicerat klockan 04:31, den 21 januari 2016
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Biznet Intros New High-Speed Services in Indonesia with Ciena

To address growing demand for cable TV and broadband services in rural and underserved areas, Biznet in Indonesia has deployed Ciena’s (NYSE: CIEN) converged packet-optical platforms and GeoMesh submarine solution on its new 100G fiber-optic terrestrial and submarine networks. The networks are designed to help drive economic growth in the region and deliver an affordable range of new high-speed information and on-demand communications services to residential and business customers. 

Key Facts:
Biznet is a major communication service provider in Indonesia with a fiber optic network that spans 15,000 km, including a submarine connection to Singapore. 

Biznet is leveraging a number of Ciena platforms to support its efforts to reduce Indonesia’s digital gap. Ciena’s 6500 Packet-Optical Platform, equipped with WaveLogic Coherent Optical Processors and integrated switching capabilities, allows Biznet to quickly deploy new services across long-distance routes, while reducing latency, power, and space requirements. By deploying Ciena’s WaveLogic 3 Extreme coherent optics across its submarine link, Biznet is able to improve the traffic carrying capacity with greater spectral efficiency and reach to lower its total cost of ownership.

Biznet is also utilizing Ciena’s software capabilities, including WaveLogic Photonics PinPoint Advanced Fiber Analytics software, which provides a complete fiber loss profile analogous to a CT scan of the network. This allows Biznet to address potential trouble spots, reduce the risk of outages and decrease repair times from days to hours. Additionally, Ciena’s unified management software provides service deployment and bandwidth optimization monitoring. Terrabit Networks, a Ciena BizConnect channel partner, provided deployment services for this project.

Biznet in Indonesia has deployed Ciena’s converged packet-optical platforms and GeoMesh submarine solution.

About Biznet
Biznet is the leading fixed-line telecommunication and multimedia provider in Indonesia, providing Internet, Data Center and Cable TV services. Established in 2000, Biznet has been providing and operating the latest fiber optic network and the biggest data center in Indonesia. 

About Ciena
Ciena (NYSE: CIEN) is the network specialist. We collaborate with customers worldwide to unlock the strategic potential of their networks and fundamentally change the way they perform and compete. Ciena leverages its deep expertise in packet and optical networking and distributed software automation to deliver solutions in alignment with its OPn architecture for next-generation networks. We enable a high-scale, programmable infrastructure that can be controlled and adapted by network-level applications, and provide open interfaces to coordinate computing, storage and network resources in a unified, virtualized environment.  Investors are encouraged to review the Investors section of our website at www.ciena.com/investors, where we routinely post press releases, SEC filings, recent news, financial results, and other announcements. From time to time we exclusively post material information to this website along with other disclosure channels that we use.

Publicerat klockan 05:09, den 18 januari 2016
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How Optical Switch Is Making a Difference in Optical Networks?

We are currently witnessing a strong worldwide trend of bringing fiber closer to individual homes and businesses, which at the same time creates a need for efficient optical-switching mechanisms. There is no doubt that optical switch plays an essential role in telecommunication networks. In this article, we are going to review the optical switching technology that help to improve the bandwidth efficiency, as well as to decrease the cost and power consumption of optical networks.

Optical Switching Technology
An optical switch is a switch that enables signals in optical fibers or integrated optical circuits (IOCs) to be selectively switched from one circuit to another. Here is how it works, as we know that most networking equipment today is still based on electronic-signals, which means that the optical signals have to be converted to electrical ones, to be amplified, regenerated or switched, and then reconverted to optical signals. Information traveling around an optical network needs to be switched through various points known as nodes. Once information arriving at a node, it will be forwarded on towards its final destination via the best possible path, which may be determined by such factors as distance, cost, and the reliability of specific routes. The conventional way to switch the information is to detect the light from the input optical fibers, convert it to an electrical signal, and then convert that back to a laser light signal, which is then sent down the fiber you want the information to go back out on. The following picture shows a 2x2A Opto-Mechanical Optical Switches.

2x2a-opto-mechanical-optical-switches

Current Situation of Optical Switches in Optical Networks
The main attraction of optical switching is that it enables routing of optical data signals without the need for conversion to electrical signals and, therefore, is independent of data rate and data protocol. The transfer of the switching function from electronics to optics will result in a reduction in the network equipment, an increase in the switching speed, and thus network throughput, and a decrease in the operating power. In addition, the elimination of E/O and O/E conversions will result in a major decrease in the overall system cost, since the equipment associated with these conversions represents the lion’s share of cost in today’s networks.

Up to now, the limitations of optical component technology—the lack of processing at bit level and the lack of efficient buffering in the optical domain, have largely limited optical switching to facility management applications. Several solutions are currently under research; the common goal for all researchers is the transition to switching systems in which optical technology plays a more central role. Unfortunately, optical switching technology is still very much in its infancy. There have been numerous proposals as to how to implement light switching between optical fibers, such as semiconductor amplifiers, liquid crystals, holographic crystals, and tiny mirrors.

Types of Optical Switches
An optical switch has one or more inputs ports and two or more output ports that we usually call 1xN or NxN optical switch. The three leading categories today would arguably be optical-electrical-optical (OEO), optical data unit (ODU), and reconfigurable optical add/drop multiplexers (ROADMs). Each of these types of optical switches has its pros and cons. When selecting the suitable ones, you should always take the bandwidth provider’s infrastructure and applications as an reference.

Summary
The discussed optical switching techniques significantly improve the function of the telecom networking by providing a wide range of different temporal and spatial switching granularities. Ultimately, when requiring an optical switch for any application, it is important to understand the types that are the most suitable solution. If you wish to discuss the right type of optical switch for an application, Fiberstore is always available to offer assistance and expertise at your convenience. We not only supply all kinds of optical switches, but offer QSFP+ transceiver and QSFP+ cable with very competitive prices.

Reference:
http://www.hit.bme.hu/~jakab/edu/litr/Core/WDM/Papadimitriou2003_switching.pdf

Publicerat klockan 04:08, den 14 januari 2016
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Introduction to 40G QSFP Options

40G Ethernet networking is the new trend for today’s big data age as 10G links cannot meet users’ needs for higher bandwidth. Telecommunication giants like Cisco, HP and Juniper are releasing relevant 40G optical devices to support this new technology. Of all the 40G optical options, 40G QSFP and QSFP cables are the most commonly utilized devices. Today’s article will make a brief introduction to 40GbE QSFP and QSFP cables.

40GbE QSFP Transceiver Modules
QSFP transceiver is a compact, hot-pluggable transceiver used for 40G data communications applications. QSFP interfaces networking hardware to a fiber optic cable. Compared with SFP modules, QSFP transceivers increase the port-density of 3-4 times and integrates 4 independent 10 gigabit per second data lanes in each direction to provide 40Gbps bandwidth. 40GbE QSFP transceiver is widely applied in Ethernet, Fibre Channel, InfiniBand and SONET/SDH standards with different data rate options. A variety of QSFP transceivers are available on the market, such as QSFP-40G-CSR4, QSFP-40G-PLR4, 40GBASE-PLRL4, QSFP-40G-SR4, QSFP-40G-LR4, etc. Take QSFP-40G-CSR4 (see in Figure 1) as an example, it is the compatible Cisco 40GBASE-CSR4 QSFP modules that extend the reach of the IEEE 40GBASE-SR4 interface to 300 and 400 meters on laser-optimized OM3 and OM4 multi-mode parallel fiber, respectively. It primarily enables high-bandwidth 40G optical links over 12-fiber parallel fiber terminated with MPO/MTP multifiber connectors.

Cisco QSFP-40G-CSR4

40G Cabling Options
40G cable is also known as QSFP cable. QSFP direct attach copper cable (DAC) and QSFP active optical cable (AOC) are the two common types of 40G cables on the market. Active optical cable provides a more flexible cabling than DAC cables with the advantages of lighter weight, longer transmission distance and higher performance. Recently 40G AOC assemblies are very popular among users.

QSFP+ AOC is a high performance integrated cable for short-range multi-lane data communication and interconnect applications. It integrates four data lanes in each direction with 40Gbps aggregate bandwidth. Each lane can operate at 10Gbps with lengths ranging from one to 100m. Fiberstore QSFP+AOC solution is designed for high-density applications. Usually they can be applied in following areas: InfiniBand QDR (4 x 10G), DDR (4 x 5G) and SDR (4 x 2.5G) interconnects, High Performance and High Productivity computer interconnects, Data Aggregation, Backplane and Proprietary Density Applications, PCI-Express, SAS/SATA, Fibre Channel compatible interconnect, Datacom and Telecom switch and router backplane connections. Figure 2 presents a QSFP+ AOC.

QSFP+ AOC

There are DAC cables (see in Figure 3) available for 40GbE optics when short distance (within the same rack) cabling runs are needed. Passive cables are available in the standard one, three, and five-meter lengths. Active cables are available for longer runs. QSFP+ passive copper cable is an extension of the established interface system SFP+ and was developed for 40Gb Ethernet and 40Gb/s Infiniband QDR applications. 40GbE passive copper cables provide robust connections for leading edge 40G systems filling the need for short, cost-effective connectivity in the data center. Passive copper cables require no additional power to ensure quality connectivity. The QSFP+ passive cable assemblies are high performance, cost effective solutions for 40G LAN, HPC and SAN applications.

DAC cables

Conclusion
2010 witnessed the ratification of the IEEE 802.3ba standard for 40G Ethernet. Deploying 40G data center will likely include using a combination of 40G modules and 40G cables. Thus choosing the right one for the right area of data center will have great effect in achieving reliable 40G speed. Fiberstore offers the 40GbE optical devices including 40G QSFP and 40G DAC cables with high performance and low prices. If you have any requirement of our products, please send your inquiry to us.

Reference:
http://angel3508.blogspot.com/2015/12/qsfp-passive-copper-cable-pcc.html

Ericsson, AT&T team up on connected water solution

LAS VEGAS – Ericsson announced a partnership with AT&T on a sustainable city initiative designed to bring connectivity to the city of Atlanta’s water supply.

The trials are said to allow the organization overseeing the Chattahoochee River Basin, which is the main drinking water source in Atlanta, to monitor water quality from a remote location. The technology was developed by the Ericsson as part of its Technology for Good innovation challenge. The goal of this project was to significantly bring down the cost of water quality testing.

“When you’re taking about environmental monitoring and environmental sustainability, there is really only one category of device on the market and those are industrialized devices that are made for municipal water systems or for governmental agencies so they are very expensive,” explained Charles Dasher, Ericsson’s technology design lead at the Atlanta Idea Factory, as part of a demo of the solution.

“Connectivity is driving cities to rethink how they use technology to benefit their residents. AT&T is excited to be a part of these first field trials and we look forward to providing the connectivity to enable cities to become smarter and more sustainable,” added Mike Zeto, GM of smart cities at AT&T.

Dasher, the mastermind behind the solution, says the technology uses sensors designed by Ericsson and connectivity provided by AT&T to measure the conductivity, turbidity, temperature and thermometry of the water supply.

“What we’ve done is we’ve taken a $10,000 device and we’ve shrunk the cost down to under $300 including connectivity and we’ve connected it using LTE Category 1 power saving mode,” Dasher explained. “This allows us to have an increased amount of sampling in terms of how often during the day do we take samples, but more importantly, it increases our battery life by years and years and years.”

This is not the first or last time the Swedish equipment maker and AT&T U.S. are expected to team up on “Internet of Things’ solutions. Both announced earlier this week they will be part of a smart city alliance that also includes industry heavyweights Cisco, Deloitte, Ericsson, GE, IBM, Intel and Qualcomm.

Publicerat klockan 05:26, den 8 januari 2016
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How to Install and Remove a SFP Transceiver Modules

Knowing how to install or remove a SFP transceiver modules is very essential for subscribers because they sometimes may encounter some technical problems. It is troublesome to ask an engineer for help every time, even for some minor faults. Therefore, the articles provide the installation and removal instructions for SFP (small form-factor pluggables) transceiver modules. These devices are hot-swappable input/output (I/O) devices, which are the key components in today's transmission network. After going through this passage, I hope subscribers can independently solve some minor technical problems.

Warming Tips About Installing or Removing SFP
Disconnect all cables before removing or installing a transceiver module and prevent the cables, connectors, and the optical interfaces from damage.

Always remember to protect the SFP modules by inserting clean dust covers into them after the cables are removed. Avoid getting dust and other contaminants into the optical ports of your SFP modules.

Regularly remove and install a transceiver module can shorten its useful life. Thus, you should not be removed or inserted a transceiver module unless it is necessary. Transceiver modules are sensitive to static, so be sure to use an ESD wrist strap or comparable grounding device during both installation and removal.

Installing SFP Module
To install this type of SFP module, follow these steps:
Step 1. Attach an ESD-preventive wrist strap to your wrist and to the ESD ground connector or a bare metal surface on your chassis.
Step 2. Remove the SFP Transceiver Module from its protective packaging.
Step 3. Check the label on the SFP transceiver body to verify that you have the correct model for your network.
Step 4. Find the send (TX) and receive (RX) markings that identify the top side of the SFP transceiver.
Step 5. Position the SFP transceiver in front of the socket opening.
Step 6. Insert the SFP transceiver into the socket until you feel the SFP Transceiver Module connector snap into place in the socket connector.
Step 7. Remove the dust plugs from the network interface cable LC connectors. Save the dust plugs for future use.
Step 8. Inspect and clean the LC connector’s fiber-optic end-faces.
Step 9. Remove the dust plugs from the SFP transceiver optical bores.
Step 10. Immediately attach the network interface cable LC connector to the SFP transceiver.
Step 11. Connect the 1000BASE-T SFP transceivers to a copper network.
Step 12. Observe the port status LED

Removing SFP Module
Step 1. Attach an ESD-preventive wrist strap to your wrist and to the ESD ground connector or a bare metal surface on your chassis.
Step 2. Disconnect the network fiber-optic cable or network copper cable from the SFP Transceiver Module connector. For optical SFP transceivers, immediately reinstall the dust plugs in the SFP transceiver optical bores and the fiber-optic cable LC connectors.
Step 3. Release and remove the SFP Transceiver Module from the socket connector.
Step 4. Place the removed SFP transceiver in an antistatic bag or other protective environment.

SFP transceiver modules have three types of latching devices to secure an SFP transceiver in a port socket: SFP transceiver with a Mylar tab latch, SFP transceiver with an actuator button latch, SFP transceiver that has a bale-clasp latch. Before you take step to install and remove your SFP modules, you must figure out what types of latching you use. Take SFP-GE-SX-MM850-A as an example, it is the SFP transceiver that has a bale-clasp latch. Thus during the installation, you must verify that the SFP modules are completely seated and secured in their assigned receptacles. If the SFP module is not completely seated and secured in the receptacle, you will hear a click as the triangular pin on the bottom of the SFP module snaps into the hole in the receptacle. The following image introduces the basic components of a Bale Clasp SFP Module.

SFP transceiver that has a bale-clasp latch

Conclusion
Learning how to install and remove a SFP transceiver modules is very helpful even though you are not a professional telecom engineer. But you’d better not proceed the installation and removal process without a guidance of an expert, or you may get into trouble. Fiberstore are committed to provide users with the best services in telecom field. we offers a large variety of high-performance, low-price SFP transceiver modules like AA1419013-E5. If you have any questions about today’s topic, welcome to contact us.

Reference:
http://www.cisco.com/c/en/us/td/docs/routers/7600/Hardware/Module_and_Line_Card_Installation_Guides/ES20_Line_Card_Installation_Guide/es20-install-guide/bald_sin.html

Publicerat klockan 04:27, den 7 januari 2016
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Introduction to Compatible Transceiver Modules

Compatible transceivers are highly favored by designers because of ease of use and affordability. Features like the monitor photo detector (MPD) for eye safety and the high-speed GaAs PIN photodiode are often presented in compatible modules. But many customers don’t trust OEM or alternative party compatible transceivers. Even thought we have talked with them several times about our 3-party compatible modules for Cisco and other famous brand like Juniper, HP, extreme. Here I’d like to dig into some features of compatibility transceivers. Therefore customers will hold an objective attitude about the topic after going through the whole text.

Two Factors Concerning About Compatible Transceivers
Compatibility depends on two factors. Take compatible SFP modules as an example, does a SFP need DDM function? DDM is short for Digital-diagnostic-monitoring that provides user with critical information concerning the status of transmitted and received signals. Obviously a SFP with DDM is better than one without a DDM. All you have to do is to figure out whether you need that function or not. Then make the right selection.

Does the host equipment check the ID code and lock out alternative party components? Certainly most Cisco core equipment and routers do lock out all but Cisco ID SFP modules. We do not hear any news about what Cisco equipment does and does not lock out third-party SFP.

How Does Transceiver Compatibility Work?
Each module is unique and holds its own information in EEPROM; this memory is coded with specified identifiers such as part numbers and manufacturers details. When the device is installed, the host device then checks the memory for the correct information to confirm compatibility. A hot-pluggable device is always ready to work immediately after installation. It requires no time to program or no installation woes to figure out. That’s why most designers prefer to use compatible transceivers.

Main Features of Optical Transceivers
Transceivers are hot pluggable so that they can easily take the place of the original transceiver without powering down the whole equipment. For example, a Finisar FTLF1323P1BTR transceiver may be compatible with the original Finisar SFP transceiver. This device, typically, have built-in diagnostic features, and duplex LC connector interface. This particular device will reach a transmission length of 15km and operates at a wavelength of 1310nm. The following image shows an outlook of FTLF1323P1BTR.

In general, most transceiver modules will connect with the existing electrical circuitry of the module. The transceiver module may use optical or copper network cords to accomplish this goal. Media converters, Ethernet switching, routing equipment, and distance extenders may all be featured along with transceivers. The best part about compatible transceivers is that they can be easily removed and replaced in the host device.

However, many customers may encounter a situation—why my compatible transceivers does not work with the host devices. This is a common problem, a large amount of host devices do not have a firmware check for compatibility, this is known as an “open platform”. Many compatible transceivers are sold as compatible when in fact they are open platform, they will work in many host devices but not in any that require coded transceivers. OEM SFP transceivers are coded specifically to suit each host device to avoid this problem. Even Finisar’s range of FTLF1217P2BTL and FTLF1323P1BTR SFPs are covered.

Summary
Keep in mind that the compatibility has nothing to do with the functions of the transceiver, only in recognizing ID code and selecting to lock out third-party transceiver or not. Fiberstore offers a full range of compatible transceiver modules. Till now, we did not get any negative feedback from our customers for our compatibility transceivers. Every designer should choose the devices that work best for them in order to maximize the use of the devices in their designs.

Publicerat klockan 04:13, den 5 januari 2016
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Comparison Between 40G CFP LR4 and QSFP 40GBASE-LR4 Optics

In response to the increasing bandwidth demands for data centers, the IEEE introduced the 802.3ba Ethernet standard in June 2010, which lays solid foundation for the introduction of 40G and 100G Ethernet operations. Users of this new technology continue to increase as network operators need the highest data rates over a single connection. And new optical products have become popular accordingly like 40GbE transceiver modules and DAC cables. Figuring out all the 40GbE optical devices can be confusing, then let’s start with 40G CFP LR4 and QSFP 40GBASE-LR4 modules.

They are 40GbE transceiver modules. Most 40GbE ports are capable of running in a 4x10GbE mode, allowing for 10GbE/40GbE mixed media deployments. These ports can also provide the option of ultra-high 10GbE port density. Before we come to the 40G CFP LR4and QSFP 40GBASE-LR4 modules, firstly we need to have a brief overview of QSFP and CFP transceiver modules.

What Is CFP?
CFP is the C form factor optics that are available in 40GbE and 100GbE varieties. The C represents the Latin letter C, to express the number 100 (Centum) as the standard was primarily developed for the 100 Gigabit Ethernet System. CFP is a hot-pluggable optical transceiver presenting MPO connectors for multi-mode optics or SC connectors for single-mode optics. The CFP form factor supports both the single-mode and multi-mode fiber with a variety of data rates, protocols and link lengths. The optical target interface includes a 40GBase-SR4 for 100m and 40GBase-LR4 for 10km.

CFP

What Is QSFP?
QSFP ((Quad Small Form-Factor Pluggable Plus) form factor optics are the primary way of delivering 40GbE and are now appearing in 100GbE capable form that offers customers a multitude of high-density 40 Gigabit Ethernet connectivity options for data center and high-performance computing networks. These present either MPO connectors for multi-mode optics or LC connectors for single-mode optics. The 40G QSFP+ transceiver is well suited for Infiniband and 40GBASE-SR4 / 40GBASE-LR4 applications.

QSFP

40GBase-LR4 Standards
Both CFP and QSFP support 40GBase standards. 40GBASE-LR4 ("long range") is a port type for single-mode fiber and uses 1300nm lasers. Its Physical Coding Sublayer 64b/66b PCS is defined in IEEE 802.3 Clause 82 and its Physical Medium Dependent PMD in Clause 87. It uses four wavelengths delivering serialized data at a rate of 10.3125Gbit/s per wavelength. For more information, please visit https://en.wikipedia.org/wiki/100_Gigabit_Ethernet

  • 40GBASE-LR4 CFP

40GBASE CFP modules support 40GBASE Ethernet and OTU3 standards and are interoperabile with respective industry IEEE- and/or OTU3-compliant interfaces. Take Cisco 40GBASE-LR4 CFP as an example, it supports link lengths of up to 10km over a standard pair of G.652 single-mode fiber with duplex SC connectors. The 40 Gigabit Ethernet signal is carried over four wavelengths. Multiplexing and demultiplexing of the four wavelengths are managed within the device. This CFP module supports both IEEE 40GBASE-LR4 and OTU3 C4S1-2D1 standards.

  • 40G QSFP+ LR4

The 40G QSFP+ LR4 is designed for long transmission distance used with single-mode fiber. And “4” here means four lanes. Additionally, they are in different wavelengths and with different connectors. When they used in actual network, they are used different technology. Take compatible Alcatel-Lucent QSFP-40G-LR as an example, it operates on single-mode fiber cable for supporting link lengths of 10km at a wavelength of 1310nm.

Summary
CFP form factor with digital diagnostics monitoring functionality (DDM) supports 40GBase-LR4 Ethernet standard that makes it ideally suited for 40GbE applications. 40GbE QSFP transceiver puts together four independent 10Gbps data lanes in each direction to deliver 40Gbps aggregate bandwidth. And there are both active and passive QSFP cable assemblies to support Fiber Channel, Infiniband, and Ethernet protocols. Fiberstore offers all kinds of 40G transceiver modules and QSFP+ cables (For example, QSFP-H40G-AOC15M is QSFP+ to QSFP+ active optical direct-attach cables supporting a short distance of 15m). You can find all you need here at Fiberstore.

Citynet deploys MRV optical transport systems in Austria

telecom engineerCitynet, a regional carrier network in Austria and a group within Hall AG, has turned to longtime optical transport systems partner MRV Communications, Inc. (NASDAQ: MRVC) for additional equipment to extend it fiber-optic network capabilities. In particular, Citynet is installing MRV's flagship OptiDriver platform.

Citynet serves large enterprises, residential customers, and several mountain ski resorts and lift infrastructure in the Inn Valley region of Austria. It offers DSL, dedicated fiber, VPN, IPTV, and cloud services. MRV has supplied optical and packet transport technology to Citynet for more than 10 years. These deployments include the company's OptiSwitch as customer premises equipment (CPE), aggregation, and core platforms, as well as MRV's Fiber Driver and OptiDriver systems for business and enterprise services.

The new OptiDriver deployments focus on the ability to deliver more high-capacity services to Citynet's enterprise customers as well as expand its service footprint to more regions via leased fiber-optic network infrastructure.

"Ultimately, we chose MRV because of the reliability we have experienced over the years," states Manuel Kofler, head of IT Department for Hall AG. "The evolving mix of features, and ease of operations, are critical components to ensure ubiquitous access and maximum performance for our customers. DWDM and packet solutions being provided by a single vendor helps streamline our products and simplifies the processes."

Publicerat klockan 05:00, den 29 december 2015
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Postat i kategorin Okategoriserat och taggat som fiber optic cable,

QSFP+ Passive Copper Cable (PCC)

Today’s enterprises are undergoing migration from 10GbE to 40GbE and establishing a framework for 100 Gigabit Ethernet network as a result of the ever-increasing server speeds requirement. QSFP+ passive copper cables provide a cost-effective solution for interconnecting high speed 40GbE switches and servers. This post will provide an overview of the 40G QSFP+ passive copper cables, helping users to take maximum advantage of the 40GbE architecture with appropriate interconnects and cost-effective selection.

What Is PCC?
PCC is short for passive copper cables, which contains no electrical components. Fiberstore has released 10G SFP+ and QSFP+ passive copper cabling and products family for its products line. The SFP+ copper cable assemblies were developed as a lower-power alternative to optical cables for short reach links in high-speed interconnect applications such as high-performance computing, enterprise networking and network storage systems. The low latency assemblies support data transfer rates up to 10Gb/s per lane. Since QSFP+ cables have something in common with SFP+ cables, let us first get to know about 10G SFP+ passive copper cable.

Select 10G SFP+ Passive Copper Cable to Optimize Your Design
SFP+ direct attach passive copper cable assemblies are a high-speed, cost-effective alternative to fiber optics in 10Gb Ethernet. It uses in physical infrastructure, businesses can achieve 10 Gigabit performance port-to-port without additional signal processing or conversion, providing a low power, low latency 10 Gb/s server interconnect option for top of rack switching applications. For example: Arista CAB-SFP-SFP-1M compatible SFP+ to SFP+ passive copper cable can support short-length of 1m.

Arista CAB-SFP-SFP-1M

QSFP+ (Quad Small Form-factor Pluggable Plus) copper cable assemblies were developed for high-density applications, offering a cost-effective, and low-power option for high-speed data center interconnects up to 10 meters. The QSFP+ form factor can replace up to four standard SFP+ connections, providing greater density and reduced system cost.

What Is QSFP+ Passive Copper Cable?
QSFP+ passive copper cable is an extension of the established interface system SFP+ and was developed for 40Gb Ethernet and 40Gb/s Infiniband QDR applications. 40GbE passive copper cables provide robust connections for leading edge 40G systems. 40G passive copper cables fill the need for short, cost-effective connectivity in the data center. Passive copper cables require no additional power to ensure quality connectivity. 40GE QSFP+ passive copper cables have extremely low power consumption which improves data center power consumption and thermal efficiency. The QSFP+ passive cable assemblies are high performance, cost effective solutions for 40G LAN, HPC and SAN applications. QSFP+ to QSFP+ passive direct attach cables is one of the common types of QSFP+ passive copper cables and it will be introduced in the following passage.

QSFP+ to QSFP+ passive direct attach cables are hot-removable and hot-insertable. A QSFP+ to QSFP+ passive copper cable consists of a cable assembly that connects directly into two QSFP+ modules, one at each end of the cable. The cables use integrated duplex serial data links for bidirectional communication and are designed for data rates up to 40Gbps. There are various QSFP+ to QSFP+ passive copper cables branded by famous brands, like Cisco, HP, Juniper, Brocade, etc. The following picture shows a Juniper QFX-QSFP-DAC-1M Compatible QSFP+ to QSFP+ passive copper cable.

Juniper QFX-QSFP-DAC-1M

Summary
Designed for short length, high speed interconnects, this low power, low latency passive copper cable is a cost-effective alternative to fiber optic cable assemblies and is intended for short distance applications. Fiberstore provide SFP+ direct attached cables and QSFP+ passive direct attached cables can reach up to 10 meters. Both passive and active SFP+ and QSFP+ devices are available in addition to other various devices. More details, please feel free to contact us.

Unlock the Misunderstanding Between Transceiver and Transponder

Here's a question that has been obsessing me for a while. What's the difference between a transceiver and a transponder? Since they have a same prefix “trans”, people have misconception about the two. Normally, I see transponders associated with microwave communications, but the terms still seem interchangeble. Therefore, in today’s article, we are going to talk about the difference between them to help you unlock the misunderstanding about the transceiver and transponder.

First we need to fully understand transceivers and transponders to be able to compare the two. This is a question that requires a clear and concise answer to dismiss any presumptions or misconception around the subject.

What Is Fiber Optic Transceiver?
To begin with, a transceiver is a device which include both a receiver and transmitter (the name "transceiver" is actually short for transmitter-receiver). The purpose of a transceiver is to transmit and receive data. In telecommunication field, the common used transceivers are hot-pluggable plugging into module sockets to connect the electrical circuitry of the module with the optical or copper network. In addition to sending information back and forth, they also help direct the flow of traffic, convert data, and even format information as it comes in and out of the pike. There are many types of transceivers in the market, including optical transceivers, which are used in fiber optic settings like cable and networking interfaces, including GBIC, SFP, SFP+, XFP, CFP, QSFP, etc. Figure 1 shows a MGBLX1. It is a SFP module used for both telecommunication and data communications applications supporting a link length of up to 10km.

MGBLX1

Introduction to Fiber Optic Transponder
A transponder includes a transmitter and a responder. If used for identification (think of transponders in an airplane setting, for instance), its function is to send out an identifier signal when an outside signal requests identification. But when used in telecom field, a transponder is the element that sends and receives the optical signal from a fiber. It acts as a channel where data such as images, video, and audio can travel. This type of transponder is used for satellites and broadcasting. According to its specific applications, it is also known as wavelength-converting transponder, WDM transponder or fiber to fiber media converter. After the short definition of the transceiver and transponder, it seems that they are both functionally similar devices that convert a full-duplex signal in a full-duplex optical signal. So who wins the battle of the transceiver vs. transponder?

Transceiver vs. Transponder
One way that a transceiver differs from a transponder is through their respective interfaces. A transceiver uses a serial interface, while a transponder uses a parallel interface. This causes a difference in consumption of resources, such as power. Figure 2 shows a contrast between transponder (Standalone 10G OEO Converter Repeater with XFP Slot to XFP Slot) and transceiver (GP-QSFP-40GE-1LR—Compatible Dell Force QSFP+ transceiver). Additionally, transceivers are limited to provide an electrical-optical function, while transponders convert between two different optical wavelengths. This has an effect on energy consumption, bandwidth, and data transmission rates as well.

contrast between transponder and transceiver

Summary
Hopefully this article has helped you to fully understand transceivers, transponders, and the difference between the two to help you unlock the misconception. And you will To find the best transceivers and transponders to suit your business, please visit Fiberstore. We supply a variety of optical transceivers and transponders for you to choose from. This way you can find the most effective and suitable product for your business needs.

Publicerat klockan 04:05, den 22 december 2015
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Vivendi gets its way at Telecom Italia AGM

The big Telecom Italia shareholder showdown concluded decisively in favour of French conglomerate Vivendi, which owns a fifth of its shares.

Vivendi wanted to enlarge the board of directors from 13 to 17 members, with the four new spots being taken by its own nominees. It only needed to get the support of the majority of attending shareholders for that motion to pass, and it managed a reported 53%. So now Vivendi’s Arnaud Roy de Puyfontaine, Stephane Roussel, Hervé Philippe and consultant Felicité Herzog will sit on the TI board, although a minor motion exempting them from a non-compete agreement wasn’t approved.

The other key motion being voted on was TI’s bid to convert savings shares into ordinary ones, which would result in dilution of ordinary shareholders’ share in the company by around 30%, thus presumably weakening Vivendi’s claims on board representation. This one required a two thirds majority to be passed but only managed 62.5%, and hence was rejected. This was pretty much entirely down to Vivendi since only 56% of ordinary shareholders voted, meaning its 20% share accounted for more than a third of voters on the day.

The support Vivendi must have received from other shareholders for its board representation implies they managed to convince some investors that it could have a positive influence on the way the company is run. It remains to be seen, however, exactly how Vivendi intends to use its increased influence.

Original published:
http://telecoms.com/459452/vivendi-gets-its-way-at-telecom-italia-agm/

Publicerat klockan 10:55, den 21 december 2015
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Postat i kategorin Okategoriserat och taggat som telecom italia, vivendi,

40G Direct Attach Cable (DAC) Cables Overview

40GbE network is now the new trend for higher data transmission. As a result, 40G optical devices are sprang up like mushrooms, Of which QSFP+ transceiver modules and 40G AOC/DAC are mostly favored by subscribers. 40G direct attach cable provides a cost-effective solution for high-density network connectivity. In today’s blog, we are going to focus on some basic information about 40G direct attach cables.

Introduction to Direct Attach Cables
Direct attach cable (DAC) is a form of high speed cable with “transceivers” on either end used to connect switches to routers or servers. It a kind of optical transceiver assembly. DAC cables are not real optics and their components are without optical lasers. DACs are much cheaper than the regular optics. Because of their low cost, low power consumption and high performances, DAC cables are the preferable choice for storage area network, data center, and high-performance computing connectivity.

For 40G DAC Cables—Active or Passive?
DAC Cables are designed in either active or passive versions. They are widely available in telecom field. 40G DAC cables transmit 40GbE over short distances of parallel coaxial copper cabling. It uses a special cabling assembly with four lanes of coaxial cabling. Four pairs each transmit 10 Gbps in one direction and four transmit 10 Gbps in the other direction for a total data rate of 40 Gbps. QSFP to QSFP and QSFP to 4 SFP+ copper direct-attach cables are the two common types of 40G DAC cables.

For example, Arista 40G QSFP+ cables deploy both active copper cables and passive copper cables. Take closer look at CAB-Q-Q-0.5M, it is the compatible Arista CAB-Q-Q-0.5M (see in Figure 1) QSFP+ to QSFP+ copper direct-attach cables. It is suitable for very short distances and transmit over passive copper cables for 40-gigabit link.

CAB-Q-Q-0.5M

Active optical cables is short for AOC. AOC uses electrical-to-optical conversion on the cable ends to improve speed and distance performance of the cable while mating with electrical interface standard. Compared with direct attach copper cables, its smaller size, longer transmission distance, lower insertion loss and electromagnetic interference immunity make it popular among subscribers. Arista AOC-Q-Q-40G-3M (see in Figure 1) operates over active optical cables for higher performance in 40 Gigabit Ethernet.
AOC-Q-Q-40G-3M

Comparison Between Passive and Active
A debate that whether you should choose optical cable over cooper or verse is the long-term unresolved problems existed in telecommunication industry. Just like that, people are wondering whether to choose passive or active version of fiber optic cables. Passive cabling provides a direct electrical connection between corresponding cable ends and it contains no active components to boost signal. Active cables provide the same effect but, by embedding optics and/or electronics within the connectors, can overcome some of the limitations of passive cables. While passive cables are always copper-based, active cables can use either copper wire or fiber optics to provide the link between the cable ends.

Conclusion
The 40 Gigabit Ethernet is already upon us and makes a great contribution to satisfying the increasing needs of higher bandwidth. 40G Direct Attach Cables cables, a great way to support 40GbE, were warmly welcomed by subscribers. Fiberstore supplies various kinds of DAC cable assemblies including 10G SFP+ Cables, 40G QSFP+ Cables, and 120G CXP Cables. All of our direct attach cables can meet the ever increasing need to cost-effectively deliver more bandwidth, and can also be customized to meet different requirements.

Reference:
http://www.cisco.com/c/en/us/products/collateral/interfaces-modules/transceiver-modules/data_sheet_c78-660083.pdf

Publicerat klockan 07:33, den 17 december 2015
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Optical network sales slip in third quarter 2015

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Sales of optical network hardware slipped 10% sequentially in the third quarter of 2015, according to the most recent tally from IHS (NYSE:IHS). Gains in North America were not enough to offset declines in the Europe/Middle East/Africa (EMEA) and Central America/Latin America (CALA) regions, according to the market research firm.

The quarter's shrinkage to $2.95 billion dollars also put it behind the year ago quarter by 1.7%. The disappointing results followed a 21% jump in fiber-optic network hardware sales in the second quarter (see "Optical network system spending increases sequentially in second quarter 2015: IHS").

Sales in North America grew 3% sequentially, while Asia Pacific's spending was essentially flat. The slowness in EMEA may be short-lived, IHS believes.

"The previous three quarters' results for EMEA indicated the first reversal of poor optical spending since 2009. However, third quarter results are less favorable, with a 5% year-over-year decline. We assume this is a short-term setback and the recovery will continue. However, we will monitor this closely," said Alex Green, senior research director for IT and networking at IHS. Green, apparently, is filling in for Andrew Schmitt, former research director for carrier transport networking at IHS, who has left the company to start his own firm, Cignal AI.

Looking forward, any growth the optical network market enjoys this year will come largely thanks to WDM sales, IHS predicts. Spending on WDM equipment grew 4% year-on-year in 3Q15, and will exceed $6.8 billion annually by 2019.

The demand for SONET/SDH gear will continue to head in the other direction, meanwhile, with sales declining from $2.17 billion in 2014 to just over $500 million by 2019.
The quarterly "IHS Infonetics Optical Network Hardware" report offers global market size, share, and forecasts for metro and long haul WDM and SONET/SDH equipment, Ethernet optical ports, SONET/SDH/PoS ports, and WDM ports.

For more information on high-speed transmission systems and suppliers, visit the Lightwave Buyer's Guide.

Publicerat klockan 07:59, den 16 december 2015
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Postat i kategorin Okategoriserat

Introduction to QSFP+ AOC

As the requirement of more bandwidth has increased, copper connectivity is becoming less and less attractive due to the bulk of the connectors, cables and reduced distance capability. Under this circumstance, active optical cable (AOC) has emerged, especially for the QSFP+ AOC . This cable assembly and transceiver provide a hot pluggable solution with data rates from 5Gbps up to 10Gbps per channel, which is widely used in fiber optic solutions. Today’s blog will give a brief introduction to QSFP+ AOC.

What Is Active Optical Cable?
Active Optical Cable (AOC) is used for short-range multi-lane data communication and interconnect applications. AOC uses electrical-to-optical conversion on the cable ends to improve speed and distance performance of the cable without sacrificing compatibility with standard electrical interfaces. Compared with common cable for data transmission, AOC provides more advantages, such as lighter weight, high performance, low power consumption, low interconnection loss, EMI immunity and flexibility.

QSFP+ Active Optical Cable (AOC) Assemblies
Active optical cable, namely AOC brings a more flexible cabling than direct attach copper cables with the advantages of lighter weigth, longer transmission distance and higher performance for anti-EMI. Now, 40G AOC assemblies are popular with users.

QSFP+ AOC is a high performance integrated cable for short-range multi-lane data communication and interconnect applications. It integrates four data lanes in each direction with 40Gbps aggregate bandwidth. Each lane can operate at 10Gbps with lengths ranging from one to 100m. Fiberstore QSFP+AOC solution is designed for high-density applications. Usually they can be applied in following areas: InfiniBand QDR (4 x 10G), DDR (4 x 5G) and SDR (4 x 2.5G) interconnects, High Performance and High Productivity computer interconnects, Data Aggregation, Backplane and Proprietary Density Applications, PCI-Express, SAS/SATA, Fibre Channel compatible interconnect, Datacom and Telecom switch and router backplane connections.

QSFP to 4 SFP+ Breakout AOC and QSFP to QSFP AOC
In the market, there are two common AOC for 40g Ethernet: QSFP to 4 SFP+ breakout AOC and QSFP to QSFP AOC. The former is a 4×10Gb/s parallel active optical cable which transmits four separate streams of 10Gb/s data over ribbon cables in a point-to-multipoint configuration. The cable contains a QSFP+ module on one end and four separate SFP+ modules at the other ends. The latter is a 40Gb/s parallel active optical cable which transmits error-free parallel 4×10Gb/s data over multi-mode fiber (MMF) ribbon cables. The following image shows a 40G-QSFP-4SFP-C-0101 ( right) and 40G-QSFP-C-0501 (left).

QSFP to 4 SFP+ Breakout AOC and QSFP to QSFP AOC

Conclusion
With its benefits, AOC is widely used in many fields as well as promoting the traditional data center to step into optical interconnection. The market of AOCs will keep growing and has a broad prospect. Fiberstore AOCs achieve high data rates over long reaches which are the best solutions for high-performance computing and storage applications. We supply AOC products such as 10G SFP+ AOCs, 40G QSFP+ AOCs, QSFP+ to 4 SFP+ AOCs, 40G-QSFP-C-0501, QSFP+ to 8 x LC AOCs and 120G CXP AOCs etc. If you have any requirements of these products, please send your inquiry to us.