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FAQ About OM4 Fiber

The explosion in demand for bandwidth in enterprise networks is driving an urgent need for higher speeds Ethernet network. Increasingly, These higher bandwidth systems Requirements have dictated a need to transition from cost-effective multi-mode system to more costly single-mode systems. Until OM4 was formally Unspecified, many 40G and 100G applications wouldhave had to make the leap to single-mode systems solutions. OM4 effectively Provides an additional layer of performance That supports These applications at longer distances.

What is "OM4" fiber?

OM4 is a laser-optimized, high-bandwidth 50 micrometer multimode fiber. In August of 2009, TIA / EIA Approved and released 492AAAD, Which defines the performance criteria for this grade of optical fiber. It Can Be Used to Enhance the system cost benefits enabled by 850 nm VCSELs for the breading 1 G and 10 Gb / s applications as well as the 40 and 100 Gb / s systems. For example, Fibestore's Push-Pull MPO patch cable is manufactured using laser-optimized, 50/125, OM4 multimode cable, and supports speeds up to 100GbE. OM4 fiber can support Ethernet, Fibre Channel, and OIF applications, allo wing extended reach upwards of 550 meters at 10 Gb / s for ultra long building backbones and medium length campus backbones. OM4 fiber is overpriced especially well suited for shorter reach data center and high performance computing applications.

What are the standards That Define the use of OM4 fiber?

There are a number of standards under development thatwill define the use of OM4 fiber for high-speed transmission. Within the TIA, work is progressing on TIA 492AAAD, Which will containe the OM4 fiber performance specifications. Similarly, the IEC is working in parallel to adopt equivalent specs That is documented in the international fiber IEC 60793-2-10.

What bandwidth does the standard specify for OM4 fiber?

As of this writing, there is general agreement Among the Standards Committee OM4 That Has a Significantly higher bandwidth (EMB of 4700 MHz-km with VCSEL launch at 850 nm) than OM3. It is overpriced backward compatible with applications calling for OFL bandwidth of at least 500 MHz-km at 1300 nm (eg FDDI, IEEE 100Base-FX, 1000BASE-LX, 10GBASE-LX4, and 10GBASE-LRM). There was some discussion and debate within the standards groups about a minimum OFL bandwidth Requirement at 850 nm. It has been shown That fiber with higher OFL bandwidth can perform better with VCSELs That launch more power into outer modes. That is why the existing OM3 fiber Standards Require a minimum 1500 MHz-km OFL bandwidth at 850 nm.

What's the difference between OM3 and OM4?

It is Important to note That OM4 glass ice Not necessarily Designed to be a replacement for OM3. Despite the Relatively long-standing availability of OM4, There are no plans to obsolete OM3 fiber optic cabling. For most systems, OM3 glass ice Sufficient to cover the bandwidth needs at the distances of the current installation base. Most System Requirements can still ask Reliably and cost-effectively Achieved with OM3, and this ice type will the remain available for the foreseeable future. Despite the availability of OM4 ice cream, OM3 is quite Capable of 40 and 100 Gb / s applications albeit at Significantly shorter distances than OM4. For instance, Cisco QSFP-40G-CSR4  compatible transceiver from Fibre store can reach 300m and 400m, respectively over OM3 and OM4 cables.

A variety of cable configurations are available Utilizing the OM4 fiber for in-building and inter-building applications including The Following types: distribution, breakout, interconnect, loose tube and industrial armored. All of Fiber store's OM4 cable assemblies are with high quality and competitive prices. They are assembled and 100% Optically tested in the factory prior to shipment.

Publicerat klockan 09:43, den 23 februari 2016
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Postat i kategorin Okategoriserat och taggat som qsfp-40g-csr4, push-pull mpo patch cable,

CFP/QSFP Transceiver for 40/100G Network

In June 2010, IEEE published the IEEE 802.3ba standard for 40 Gigabit and 100 Gigabit Ethernet. The market for 100G Ethernet is driven by high bandwidth switching and routing for core network aggregation of 10G and 40G Ethernet links. 40G and 100G Ethernet networks are more and more installed to meet the increasing requirement for higher speed and more bandwidth.

The CFP transceiver is defined as hot-pluggable optical transceiver form factors to enable 40 Gbit/s and 100 Gbit/s applications, which is specified by a multi-source agreement to produce a common form-factor for the transmission of high-speed digital signals. The c stands for the Latin letter C used to express the number 100 (centum). CFP transceiver was designed after SFP transceiver interface, but it supports much larger internet speed — 100G, which is realized by using 10×10Gbit/s in each direction.

CFP transceiver is currently defined two next generation 100G form factors - CFP2 and CFP4. Compared to the existing CFP, CFP2 and CFP4 are respectively double and quadruple front panel port density. A brief introduction will be given to CFP2 and CFP4.


The 100Gbps CFP is designed to link IP routers, or an IP router to a DWDM platform for longer distance transmission. CFP transceivers are volume-deployed, mature and, low cost 10Gbps components, and ideally suited for 100Gbps extended reach inter-data center connections and wireless and wireline service back-hauling applications, at a most compelling cost point.

QSFP+/ CFP/ CXP are types of transceivers operating with 40/100GBASE parallel optics protocols. Generally, QSFP+ transceiver has a transfer rate of 40 Gbps, while CFP has a transfer rate of 40 Gbps or 100 Gbps. CXP is dedicated usually for 100G transmission and has a transfer rate of 100 Gbps. QSFP transceiver is a high performance, low power consumption, long reach interconnect solution supporting 40G Ethernet, fiber channel and PCIe. It is compliant with the QSFP MSA and IEEE P802.3ba 40GBASE-SR4. QSFP AOC is an assembly of 4 full-duplex lanes, where each lane is capable of transmitting data at rates up to 10Gb/s, providing an aggregated rate of 40Gb/s.

The Quad Small Form-factor Pluggable (QSFP) is a compact, hot-pluggable transceiver used for data communications applications in 40 Gigabit per second links. The 40 Gb/s QSFP+ transceiver is a fiber optical module with four channels. The QSFP specification accommodates Ethernet, Fibre Channel, InfiniBand and SONET/SDH standards with different data rate options. QSFP+ transceivers are designed to carry Serial Attached SCSI, 40G Ethernet, QDR (40G) and FDR (56G) Infiniband, and other communications standards. Commonly types of QSFP/QSFP+ optical transceivers on the market are QSFP-40G-PLR4, QSFP-40G-CSR4, 40GBASE-PLRL4, QSFP-40G-LR4, and QSFP-40G-SR4.

The QSFP is already the favoured interface for active optical cables that encapsulate the optics within the cable and which provide an attractive alternative to copper interconnect. QSFP transceivers support quad data rate (QDR) 4xInfiniband as well as extending the reach of 4x10Gbps Ethernet beyond copper's 7m. The QSFP is also an option for more compact 40GbE short-reach interfaces.

Fiberstore offers customers 40 Gigabit Ethernet and 100 Gigabit Ethernet connectivity options for data center networking, enterprise core aggregation, and service provider transport applications. Since the products are all in good quality and low price, it may be the best choice for you to deploy the network.

Publicerat klockan 07:43, den 12 januari 2016
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40G and 100G Pluggable Optics in Data Center

In order to meet the demand for increased network bandwidth, migration to 40G Ethernet links for switch to server and storage area network connections in data centers and 100G Ethernet links for core switching and routing connections in the backbone is the trend.

The requirement for higher data rates is being driven by many factors. Switching and routing, virtualization, convergence and high-performance computing environments are examples of where these higher network speeds will be required within the data center environment. Additionally, Internet exchanges and service provider peering points and high-bandwidth applications, such as video-on-demand, will drive the need for a migration from 10- to 40- and 100-Gbit interfaces.

40G Pluggable Optics

There is various ideal equipment for 40 Gigabit Ethernet applications, such as cables, transceivers, connectors and switches for 40G transmission. For instance, OM3 and OM4 multimode fibers are widely used in 40 Gigabit applications especially in data centers. These cables have lower cost than singlemode fibers, for they can avoid higher costs created by single-mode laser source. The transceivers connected by cables is at the center of the 40 Gigabit Ethernet network layer. They are usually connected by OM3 or OM4 fibers and can be plugged into a variety of components including interface cards and switches or network servers. The common types of 40G transceivers are C Form-factor Pluggable (CFP) transceivers, Quad Small-Form Pluggable (QSFP) transceivers and CXP transceivers. For example, Cisco QSFP-40G-CSR4 compatible QSFP+ transceiver supports link lengths of 82m, 300m and 400m, respectively, on OM2, OM3 and OM4 multimode fibers at a wavelength of 850nm.


100G Pluggable Optics

100G is ready here. Tens of thousands of 100G Ethernet links deployed in core routers and carrier switches. Vast majority are CFP modules and CFP2 deployments are now starting. In addition,100G is rapidly expanding. For instance, new optical standards for the data center (100G SR4, CWDM4, PSM4) and new higher density 100G module form factors like CFP4 and QSFP28 are on the way. High port-count 100G switches are being designed and many 100G modules will be used to support high-density 10G and 25G. It is said that 100G and 4x 25G deployments are expected to grow substantially starting in 2015. 100G products mainly include 100GBASE-SR10 and 100GBASE-LR4 CFP/CFP2/CFP4 and 120G AOCs. Additionally, QSFP28 as the 100G module form factor of choice for new data center switches is also launched.

40G vs. 100G in the Data Center

The most direct difference of 40G and 100G optics is the data rate. But actually, 40G and 100G optics have their own merits.

Characteristic of 40G Pluggable Optics

  • Lowest cost per bit
  • MMF reaches up to 300 m
  • Breaks out to 4 x 10G

Characteristic of 100G Pluggable Optics

  • Highest density per bit
  • Lowest power consumption
  • MMF reaches up to 100m for now
  • Breaks out to 4 x 25GE

Content and application growth is driving the growth in bandwidth and traffic as well as growth in optical links. 40G and 100G optics developments are supporting the growth in traffic with smaller module form factors for higher port density with lower power consumption and lower cost per bit. Meanwhile, new link speeds like 25G, 50G, 200G and 400G are being standardized. The pluggable optics will continue to develop to further satisfy the changing requirements in data center.

Publicerat klockan 03:29, den 6 januari 2016
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40GBASE-SR4 QSFP + Transceiver Overview

QSFP+ interfaces a network device motherboard (for a switch, router, media converter or similar device) to a fiber optic cable. It is an industry format jointly developed and supported by many network component vendors, supporting data rates from 4x10 Gbit/s. The 40GBASE QSFP+ modules offer customers a wide variety of high-density 40 Gigabit Ethernet connectivity options for data center, high-performance computing networks, enterprise core and distribution layers, and service provider transport applications.

The IEEE 802.3ba committee ratified the 40 Gigabit Ethernet standard and along with the general specification, defined a number of fiber optic interfaces. The 40G QSFP+ standard interfaces include QSFP-40G-SR4, QSFP-40G-CSR4, QSFP-40GE-LR4, etc. The following part will mainly introduce the 40GBASE-SR4 QSFP+ transceiver.

Specifications of 40GBASE-SR4 QSFP + Transceiver

The 40GBASE-SR4 QSFP+ transceiver modules support link lengths of 100m and 150m respectively on laser-optimized OM3 and OM4 multimode fibers. It primarily enables high-bandwidth 40G optical links over 12-fiber parallel fiber terminated with MPO/MTP multifiber connectors. And also, it can be used in a 4 x 10G mode for interoperability with 10GBASE-SR interfaces up to 100m and 150m on OM3 and OM4 fibers respectively. The worry-free 4 x 10G mode operation is enabled by the optimization of the transmit and receive optical characteristics of the QSFP-40G-SR4 to prevent receiver overload or unnecessary triggering of alarm thresholds on the 10GBASE-SR receiver, at the same time being fully interoperable with all standard 40GBASE-SR4 interfaces. The 4 x 10G connectivity is achieved by using an external 12-fiber parallel to 2-fiber duplex breakout cable, which connects the 40GBASE-SR4 module to four 10GBASE-SR optical interfaces. Below is a picture of 40GBASE-SR4 QSFP+ transceiver.


Comparison Between QSFP-40G-SR4 and QSFP-40G-CSR4

40GBASE-CSR4 QSFP modules extend the reach of the IEEE 40GBASE-SR4 interface to 300 and 400 meters on laser-optimized OM3 and OM4 multimode parallel fiber, respectively. Each 10-gigabit lane of this module is compliant to IEEE 10GBASE-SR specifications. This module can be used for native 40G optical links over 12-fiber parallel cables with MPO/MTP female connectors or in a 4x10G mode with parallel to duplex fiber breakout cables for connectivity to four 10GBASE-SR interfaces. Cisco compatible QSFP-40G-CSR4 transceiver from Fiberstore is optimized to guarantee interoperability over the complete specification range of 10GBASE-SR.

Fiber Large 40G QSFP + Solutions

As the leading and professional supplier in the optical communication industry, Fiberstore offers high quality 40G QSFP+ transceivers including 40GB-LR4-QSFP, QSFP-40G-CSR4, QSFP-40G-PLR4, QSFP-40G-SR4, etc. All these transceivers are 100% compatible with major brands like Cisco, HP, Juniper, Nortel, Force10, D-link, 3Com. If you’re connecting an optical jumper cable from the 40G QSFP+ transceiver module in a switch port straight to a server interface, you’ll need a brief cable using the correct cable connectors on each side. If you’re connecting a 40G QSFP+ transceiver module in a switch port to an optical connector termination for your data center or cabling closet, it will require a cable with different types of optical connectors on both ends.

Publicerat klockan 08:11, den 14 december 2015
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Postat i kategorin Okategoriserat och taggat som qsfp-40g-csr4, jg325b, 40gb-lr4-qsfp, qsfp-40g-sr,

How to Choose the 40G Transceivers

With the economics-driven growth of global regional and local fiber communication network over the past few decades, the ba IEEE 802.3 40Gb / s Ethernet standard was published in June, 2010. In order to meet the data transmission needs in the market, a high -Performance and flexible implementation of the IEEE 802.32012 for 40Gbps Ethernet - 40GBase optical transceivers are developed and Widely used. The 40GBase Optical Networking equipment transfers data at a rate of 40 gigabits per second over Ethernet.

40GBase optical transceivers compliant to the IEEE standards Mainly include CFP and QSFP (Quad Small Form-Factor Pluggable). Today, let's Mainly DISCUSS on how to choose the 40G QSFP transceiver. As the 40-Gigabit QSFP transceivers are used to interface networking hardware to a fiber optic cable, the choice of them depends on many factors, like the media system, the connector type, transmission distance, wavelength, etc. Thus We Should Consider all of These Factors comprehensively Before we choose the 40G QSFP transceivers.

Transport Media

Choose The Right transceivers of according to transport media, namely the fiber type. Of according to the IEEE 802.3 ba 40Gb / s Ethernet standard, there are three types of transceivers used respectively in threetypes of transport media: copper, single mode fiber (SMF) and multimode fiber (MMF).

  • Copper: 40GBASE-CR4 is a Direct Attach Cable segment with the QSFP + modules attached to each end of the cable. It Reaches 40 Gb / s Ethernet over four short-range twinaxial copper cables bundled as a single cable over a standard pair of G.652 single-mode fiber. For example, the Juniper EX-QSFP-40GE-DAC-50CM compatible QSFP + to QSFP + Copper Direct Attach Cable is suitable for very short distances and offers a very cost-effective way to Establish a 40-Gigabit link between QSFP ports of Juniper switches within racks and across adjacent racks.
  • SMEs: 40GBASE-LR4 transceiver Reaches 40 Gb / s Ethernet over four wavelengths Carried by a single mode fiber optic cable.
  • MMF 40GBASE-SR4 transceiver Reaches 40 Gb / s Ethernet over four short-range multi-mode fiber optic cables.
Connector Type

Choose The Right Which transceivers are compliant with the proper connectors. The connectors widely-used Mainly definatley Following types: Duplex LC connector, the MPO connector, and MTP connector (a high performance MPO Connector). For instance, Cisco QSFP-40GBD-SR transceiver is compliant with the Duplex LC connector, while Arista QSFP-40G-pLR4 transceiver is compliant with the MPO connector.

Transmission Distance

When we choose the ideal transceivers, we must Consider the transmission distance and the REACH Requirements We need into reality. The most common types of transceivers Divided by its transmission distance can reach up to 100m, 150m, 300m, 400m, 1km, 2km, 10km, 40km, etc. For example, Cisco QSFP-40G-CSR4 compatible QSFP + transceiver provided by fiber Store supports link lengths of 82m, 300m and 400m, respectively on OM2, OM3 and OM4 multimode fiber at a wavelength of 850nm. And some others, like QSFP-40G-ER4 Which transceiver supports link lengths of 40km on single-mode fiber cable is Designed to use in long distance transmission.


The wavelength the transceivers operate with is an Important Factor in Choosing the proper transceivers. For instance, QSFP-40G-LX4 transceiver converts 4 inputs channels (1271nm, 1291nm, 1311nm, 1331nm) of 10Gb / s electrical data to four CWDM optical signal, and multiplexes them into a single channel for 40Gb / s optical transmission. While someother transceivers like QSFP-40GBD-SR consists of two 20-Gbps transmit and receive channels in the 832-918 nm wavelength range.

Fiber Store Provides various types of 40G QSFP transceivers including single-mode and multi-mode with different channels and wavelengths. In order to Achieve a solid and successful selection of the 40G QSFP transceivers, We Should Consider all of the above-mentioned factors comprehensively.

Publicerat klockan 07:41, den 7 december 2015
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