Category Archives: Fiber Optic Transceivers

How Do Optical Transceiver Vendors Differentiate Their Transceiver Design?

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In order to get a bigger share of the market. Optical transceiver vendors are challenged in how to differentiate their optical transceiver design and give the products conform to common form factors. To understand the importance of transceiver differentiation, it is worth reviewing the purpose of multi-source agreement (MSA) transceiver form factors.

Common form factors arose so that optical equipment makers could avoid developing their own interfaces or being locked into a supplier’s proprietary design. Judged in those terms, MSAs have been a roaring success. Equipment makers can now buy optical intoptical transceiver designerfaces from several sources, all battling for the design win. MSAs have also triggered a near-decade of innovation, resulting in form factors from the 300-pin large form factor transponder MSA to the pluggable SFP+, less than a 60th its size.

But MSAs, with their dictated size and electrical interfaces, are earmarked for specific sectors. As such the protocols, line rates, and distances they support are largely predefined. Little scope, then, for differentiation. Yet vendors have developed ways to stand out. One approach is to be a founding member of an MSA. This gives the inner circle of vendors a time-to-market advantage in securing customers for emerging standards. The CFP MSA for 40- and 100-Gigabit Ethernet is one such example.

Some designs required specialist optical components that only a few vendors have, such as high-speed VCSELs used for the latest Fibre Channel interfaces. In turn, many vendors don’t have the resources—design teams and the deep pockets—needed to develop advanced technologies, such as those for 40- and 100-Gbps transponders, whether it is integrated optical devices or integrated circuits.

Being the first to integrate existing designs into smaller form factors is another way to differentiate oneself. An example is JDSU, which has integrated a tunable laser into the pluggable XFP MSA. Fiberstore also then launched tunable XFP which features with tunable and multi-protocol functions in order to further expand the product lineup of the 10G optical transceiver modules.

Optical transceiver vendors are also differentiating their products through marketing approaches. New-entrant Far Eastern vendors are selling optical transceivers directly to service providers and data center operators, bypassing equipment makers. They are also looking to differentiate on price, cutting costs where they can (including R&D) and focusing on bread-and-butter designs. They are quite happy to leave the leading vendors to make the heavy investments and battle each other in the emerging 40- and 100-Gbps markets.

Some people think differentiation doesn’t matter so much for optical transceivers since even if a vendor gets a lead, others inevitable will follow. And anyway, the cost of transporting traffic is still too high evenoptical transceiver market with the fierce competition instigated by MSAs. In turn, optical transceivers are now a permanent industry fixture and they can’t be conjured to disappear.

For optical transceiver vendors, however, the result is a market that is brutal. So can optical transceiver vendors differentiate their products? Of course they can. FS.COM (Fiberstore), a company devoting on the research & development, and offering fiber connectivity network solutions for carriers, ISPs, content providers and networks, is the global market innovator and application technology pioneer in the field of optical network devices and interconnection. In the future, they seem to change this market.

Differences Between SFP, BiDi SFP and Compact SFP

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As we know, a common SFP transceiver is generally with two ports, one is TX port which is used to transmit the signal, and the other one is RX port which is used to receive signals. Unlike common SFP transceiver, BiDi SFP transceiver is only with one port which uses an integral WDM coupler to transmit and receive signals over a single strand fiber. In fact, the compact SFP is a 2-channel BiDi SFP, which integrates two BiDi SFPs in one SFP module. Therefore, a compact SFP is also with two ports as the common SFP.

Differences Between SFP, BiDi SFP and Compact SFP

SFP, BiDi SFP and Compact SFP Connection Methods
All SFP transceivers must be used in pairs. For common SFPs, we should connect the two SFPs which have the same wavelength together. For example, we use a 850nm SFP at one end, then we must use a 850nm SFP on the other end (shown in the figure below).

common SFP

For BiDi SFP, since it transmits and receives signals with different wavelengths, we should connect the two BiDi SFPs which have the opposite wavelength together. For example, we use a 1310nm-TX/1490nm-RX BiDi SFP at one end, then we must use a 1490nm-TX/1310nm-RX BiDi SFP on the other end (shown in the figure below).

BiDi SFP
The compact SFP (GLC-2BX-D) usually uses 1490nm to transmit signal and the 1310nm to receive signal. Therefore, the compact SFP is always connected to two 1310nm-TX/1490nm-RX BiDi SFP over two single-mode fibers (shown in the figure below).

Compact SFP

BiDi SFP and Compact SFP Applications
At present, the BiDi SFP is mostly used in FTTx deployment P2P (point-to-point) connection. A FTTH/FTTB active Ethernet network consists of a central office (CO) connecting to the customer premises equipment (CPE). Active Ethernet networks use a P2P architecture in which each end customer is connected to the CO on a dedicated fiber. BiDi SFP allows a bi-directional communication on a single fiber by using wavelength multiplexing (WDM), which makes CO and CPE connection more simple. Compact SFP enormously increases CO port density by combining two single fiber transceivers into one SFP form factor. In addition, the compact SFP will significantly reduce the overall power consumption at the CO side.

Compact SFP FTTx

FS.COM BiDi and Compact SFP Sloutions
FS.COM provides a variety of BiDi SFPs. They can support different data rate and support transmission distance up to max 120 km that can meet the demands of today’s fiber services for carriers and enterprises.

FS SKU# Description
SKU00686G 1000BASE-BX SFP 1310nm-TX/1490nm-RX 10km Transceiver
SKU00687G 1000BASE-BX SFP 1490nm-TX/1310nm-RX 10km Transceiver
SKU00684G 1000BASE-BX SFP 1310nm-TX/1550nm-RX 10km Transceiver
SKU00685G 1000BASE-BX SFP 1550nm-TX/1310nm-RX 10km Transceiver
SKU10607Z 1000BASE-BX compact SFP 1490nm-TX/1310nm-RX 10km Transceiver

Related Article: A Brief Introduction of BiDi SFP Transceiver
Related Article: Can I Connect Optical Transceivers of Different Brand?

How to Connect NETGEAR 10G Switch to Your Network?

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With the growth of virtualization, cloud-based services and applications like VoIP, video streaming and IP surveillance, SMB networks need to extend beyond simple reliability to higher speed and performance. The NETGEAR ProSAFE XS712T and ProSAFE XS728T switches present the right solution for this requirement, delivering unprecedented non-blocking 10G bandwidth at an affordable cost. Have you ever used NETGEAR 10Gb switch in your network? This article may provide the knowledge of NETGEAR 10G switch deployment and its interface requirement.

NETGEAR 10G Switch Overview
As shown in the figure below, the NETGEAR ProSAFE XS712T and ProSAFE XS728T are powerful smart managed switches that come with either 12 or 24 10G copper ports and either 2 combo SFP+ (XS712T) or 4 additional dedicated SFP+ ports (XS728T) for 10G fiber links. Using these 10G slots, you can create high-speed connections to a server or network backbone. For example, you can connect switches to each other with high-speed links or link them to high-speed servers. Please note that the XS712T can provide 100M/1000M/10G copper connectivity, but the XS728T can only provide 1000M/10G copper connectivity. Fast Ethernet is not available for XS728T switch.

netgear 10g switch

How to Connect NETGEAR 10G Switch to Your Network?
The NETGEAR ProSAFE XS728T and XS712T switch is designed to provide flexibility in configuring your network connections. It can be used as your only network traffic-distribution device or with 100 Mbps (XS712T only ) , 1000 Mbps, and 10 Gbps hubs and switches.

  • Connecting devices to the switch via RJ-45 copper port

The RJ-45 copper ports of the NETGEAR ProSAFE 10G series switch comply with IEEE 10GBase-T standards. It is backward compatible, auto-negotiating between higher and lower speeds. You can use Category 5e (CAT 5e) or better Ethernet cable (CAT 6, CAT 6a, or CAT 7) to make 10G connections. AMONG, CAT5/CAT5E are supported for Gigabit speeds up to 100 meters. CAT6 twisted pair copper cabling supports 10-Gigabit speeds up to 45 meters. CAT6A or newer CAT7 cabling will allow for up to 100 meter 10GBase-T connections. Desktop switching of NETGEAR ProSAFE XS728T is shown in the figure below.

NETGEAR ProSAFE 10G Series

  • Connecting devices to the switch via SFP+ fiber port

To enable you to use fiber connections on your network (shown in the figure below) , two combo SFP+ ports of XS712T switch and four dedicated SFP+ ports of XS728T switch accommodate standard 1000M and 10G SFP+ transceiver modules. Please note that not all SFP or SFP+ transceiver modules are aavailable for NETGEAR ProSAFE 10G series switch. Following table may give you some guidance for transceiver modules option.

Backbone switching
SFP /SFP+ transceiver modules and SFP+ cables supported for ProSAFE XS712T and XS728T switch

MFG PART# Description
AGM731F NETGEAR 1000BASE-SX 850nm SFP, up to 550m
AGM732F NETGEAR 1000BASE-LX 1310nm SFP, up to 10km
AXM761 NETGEAR 10GBASE-SR 850nm SFP+, up to 300m
AXM762 NETGEAR 10GBASE-LR 1310nm SFP+, up to 10km
AXM763 NETGEAR 10GBASE-LRM 1310nm SFP+, up to 220m (XS712T only)
AXM764 NETGEAR10GBASE-LR Lite 1310nm SFP+, up to 2km
AXC761 1m NETGEAR SFP+ to SFP+ Passive Copper Cable
AXC763 3m NETGEAR SFP+ to SFP+ Passive Copper Cable

Interface Support for the QFX3500 Switch

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The high-performance Juniper Networks QFX3500 Switch addresses a wide range of deployment scenarios, which include traditional data centers, virtualized data centers, high-performance computing, network-attached and iSCSI storage, FCoE convergence, and cloud computing. This article may display some specific interfaces used for QFX3500 Switch. Hope it can help you complete your network installation and deployment.

QFX3500 Switch Overview
There are Forty-eight 10-Gbps access ports in the device use small form-factor pluggable plus (SFP+) transceivers and operate by default as 10-Gigabit Ethernet interfaces. Optionally, you can choose to configure up to 12 of the ports as 2-Gbps, 4-Gbps, or 8-Gbps Fibre Channel (FC) interfaces, and up to 36 of the ports as 1-Gigabit Ethernet interfaces (shown in the picture below). When used as a standalone Ethernet switch, four 40-Gbps uplink ports in the device use quad small form-factor pluggable plus (QSFP+) to four SFP+ copper breakout cables to support an additional 15 10-Gigabit Ethernet interfaces.

QFX3500 Switch

QFX3500 Switch Data Center Deployments
Today’s data centers are built with high-performance, small form-factor, multi-core blade and rack servers. The greater compute capacity and server densities enabled by these devices is increasing traffic levels, creating the need for a high speed, low latency, storage- and I/O-converged networking solution that can maximize performance for physical servers, virtual servers, and storage in the data center. The QFX3500 Switch delivers the ultra low latency, lossless high density 10GbE interfaces, and FCoE Transit Switch and FCoE-FC Gateway functionality demanded by today’s data center—all in a compact form factor designed to support high-performance, converged data center access networks. The QFX3500’s low power consumption optimizes the switch’s power use effectiveness (PUE) ratio to reduce data center operating costs, while front-to-back air flow meets hot and cold aisle isolation requirements.The following picture shows a QFX3500 high-performance Ethernet L2 and L3 access deployment scenario.

QFX3500 Switch Data Center Deployments

Interface Requirement for the QFX3500 Switch
The 48 small form-factor pluggable plus (SFP+) access ports in the QFX3500 device support SFP and SFP+ transceivers, as well as SFP+ direct-attach copper (DAC) cables. For added configuration flexibility, up to 36 of the QFX3500’s 48 pluggable SFP+ ports can be used in 10GbE or 1GbE mode with up to 18 of the 1GbE ports being copper. The remaining 12 ports can be used to support 2, 4, or 8 Gbps Fibre Channel modes as well as 10GbE. The four quad small form-factor pluggable plus (QSFP+) uplink ports in the QFX3500 device support QSFP+ transceivers, as well as QSFP+ DAC and DAC breakout cables. When the QFX3500 device is operating as a standalone switch, each QSFP+ port can be configuredto operate as 10-GigabitEthernet interfaces or a single 40-Gigabit Ethernet interface. By default, the uplink ports on a standalone switch are configured as 10-Gigabit Ethernet interfaces.

1000 Mbps SFP transceiver modules available for the QFX3500 switch

MFG PART Description Max transmission distance
QFX-SFP-1GE-T Juniper 1000BASE-T SFP Copper Transceiver, RJ-45 Connector 100 m (328.08 ft)
QFX-SFP-1GE-SX Juniper 1000BASE-SX SFP 850nm Transceiver, LC Connector 550 m (1804.46 ft)
QFX-SFP-1GE-LX Juniper 1000BASE-LX SFP 1310nm Transceiver, LC Connector 10 km (6.21 miles)

2GFC, 4GFC, and 8GFC Fibre Channel SFP+ module for the QFX3500 switch

MFG PART Description Max transmission distance
QFX-SFP-8GFC-SW Juniper 8G Fibre Channel SFP+ 850nm Transceiver, LC Connector 150 m (429.13ft)

10G SFP+ transceiver modules available for the QFX3500 switch

MFG PART Description Max transmission distance
QFX-SFP-10GE-USR Juniper 10GBASE-USR SFP+ 850nm Transceiver, LC Connector 100 m (328.08 ft)
QFX-SFP-10GE-SR Juniper 10GBASE-SR SFP+ 850nm Transceiver, LC Connector 300 m (984.25 ft)
QFX-SFP-10GE-LR Juniper 10GBASE-LR SFP+ 1310nm Transceiver, LC Connector 10 km (6.21 miles)
QFX-SFP-10GE-ER Juniper 10GBASE-ER SFP+ 1550nm Transceiver, LC Connector 40 km (24.86 miles)

10G SFP+ cables available for the QFX3500 switch

MFG PART Description Cable length
QFX-SFP-DAC-1M Juniper SFP+ 10 Gigabit Ethernet Direct Attach Copper (passive twinax copper cable) 1 m (3.28 ft)
QFX-SFP-DAC-3M Juniper SFP+ 10 Gigabit Ethernet Direct Attach Copper (passive twinax copper cable) 3 m (9.84 ft)
QFX-SFP-DAC-5M Juniper SFP+ 10 Gigabit Ethernet Direct Attach Copper (passive twinax copper cable) 5 m (16.40 ft)
QFX-SFP-DAC-1MA Juniper SFP+ 10 Gigabit Ethernet Direct Attach Copper (active twinax copper cable) 1 m (3.28 ft)
QFX-SFP-DAC-3MA Juniper SFP+ 10 Gigabit Ethernet Direct Attach Copper (active twinax copper cable) 3 m (9.84 ft)

40G QSFP+ transceiver modules available for the QFX3500 switch

MFG PART Description Max transmission distance
QFX-QSFP-40G-SR4 Juniper 40GBASE-SR4 QSFP+ 850nm Transceiver, MPO Connector 150 m (492.13 ft)
QFX-QSFP-40G-ESR4 Juniper 40GBASE-SR4 QSFP+ 850nm Transceiver, MPO Connector 400 m (1312.34 ft)
JNP-QSFP-40G-LX4 Juniper 40GBASE-LX4 QSFP+ 1310nm Transceiver, LC Connector 2 km (1.24 miles)

40G QSFP+ cables available for the QFX3500 switch

MFG PART Description Cable length
QFX-QSFP-DAC-1M Juniper 40-Gbps QSFP+ passive DAC cable 1 m (3.28 ft)
QFX-QSFP-DAC-3M Juniper 40-Gbps QSFP+ passive DAC cable 3 m (9.84 ft)
QFX-QSFP-DAC-5M Juniper 40-Gbps QSFP+ passive DAC cable 5 m (16.40 ft)
JNP-QSFP-DAC-5MA Juniper 40-Gbps QSFP+ active DAC cable 5 m (16.40 ft)
JNP-QSFP-DAC-7MA Juniper 40-Gbps QSFP+ active DAC cable 7 m (22.97 ft)
JNP-QSFP-DAC-10MA Juniper 40-Gbps QSFP+ active DAC cable 10 m (32.81 ft)
QFX-QSFP-DACBO-1M Juniper 40G QSFP+ to four SFP+ passive DAC breakout cables 1 m (3.28 ft)
QFX-QSFP-DACBO-3M Juniper 40G QSFP+ to four SFP+ passive DAC breakout cables 3 m (9.84 ft)

Can We Interconnect SFP, SFP+, XFP, X2 and XENPAK?

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There are many kinds of 10G optical transceivers in the market such as SFP+, XFP, X2 and XENPAK. So when we use these modules, the most confusing problem is if we can interconnect SFP+, XFP, X2 and XENPAK. Besides this, some module users also want to know if they can connect SFP to SFP+ or if then can connect 10GBASE-SR modules to 10GBASE-LR modules. In this article, I will display some common questions often asked by module users and give the right answer mainly based on Cisco optical transceivers.

1. Can we interconnect SFP-10G-SR to XENPAK-10GB-SR or X2-10GB-SR?
The answer is yes. For this problem, you just need the correct optic on each side. If your optics are singlemode you need singlemode patch cord. If your optics are multi-mode then you need multi-mode patch cord. SFP-10G-SR, XENPAK-10GB-SR and X2-10GB-SR are all multi-mode optics, so a multi-mode fiber can solve this problem.

2. Can LC-SC patch cord connect X2-10GB-SR between SFP-10G-SR?
Yes, it’ll work fine as long as your fiber patch cord is multi-mode. Actually, the SFP+ requires LC connector but the X2 may require a SC connector. So when connect SFP-10G-SR to X2-10GB-SR, we must use a LC-SC patch cable (LC connector on one fiber end, SC connector on the other fiber end).

SFP, SFP+,XFP, X2 and XENPAK

3. Is it possible to connect X2-10GB-LR to SFP-10G-SR?
The answer is not possible. The Cisco X2-10GB-LR module supports a link length of 10 kilometers on standard single-mode fiber (SMF, G.652). However, the Cisco SFP-10G-SR module supports a link length of 300m on OM3 multi-mode fiber (MMF,OM3) and 400m on OM4 multi-mode fiber (MMF,OM4). Actually, you need to use modules with the same wavelengths, i. e. SR to SR or LR to LR.

4. Can we connect SFP-10G-SR to GLC-SX-MM?
The SFP-10G-SR is 10 Gbps only. The GLC-SX-MM is 1 Gbps only. This question means can we force SFP-10G-SR to use 1Gbps speed?  This is a very common question and the response will always be the same. The answer is NO. Because the SFP-10G-SR is 10 Gbps only. It runs at 10 Gbps link rate and no other speed. GBIC, SFP, X2, QSFP, CFP modules will only negotiate to one speed and one speed only. You cannot interconnect them.

SFP-10G-SR to GLC-SX-MM

5. Can we connect GLC-SX-MM to GLC-LH-SM?
Some users wonder if they can use GLC-SX-MM together with GLC-LH-SM? In fact, the GLC-SX-MM is multi-mode LED-based. The GLC-LH-SM is singlemode laser-based. They may (sometimes) work with mode conditioning patch (MCP) cables but it’s not generally a good idea unless it’s completely unavoidable.

FS offers a variety of fiber optic transceivers (SFP+, XFP, X2 and XENPAK) at very economical prices which can satisfy your requirements from 1G to 100G Ethernet. In addition, all these optical transceivers are in stock and you can enjoy the same day shipping service. For more information, please contact us over sales@fs.com.

Related Article: Cisco SFP-10G-SR: All You Need to Know

100G Optical Transceivers Will Be More Popular in 2016

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According to a newly published report by Dell’Oro Group, the worldwide service provider core router market is expected to reach $3.4 billion in revenue in 2020 as 100G port shipments spur growth. There is a significant increase in deployments of 100G ports, driven by the continuous increase in IP traffic as well as the availability of higher capacity line cards in 2015. Besides, pricing declined significantly in 2015 for 100G as there was a mix shift in the types of routers on which 100G ports were installed. Furthermore, the availability of advanced optics in CFP2 and CPAK has pushed down pricing on 100G. Therefore, we expect 100G optical transceivers will be more and more popular in 2016.

100G Optical Transceiver Modules: from CFP to QSFP28
At present market, the 100G optical transceiver module include CXP, CFP, CFP2, CPAK, CFP4 and QSFP28. Among them, QSFP28 demonstrates its great superiority and will lead to denser optics and further price reductions. The QSFP28 increases front-panel density by 250% over QSFP+. The increase in panel density is even more dramatic when compared to some of the other 100G transceiver module: 450% versus the CFP2 and 360% versus the CPAK. In addition, the surge of QSFP28 shipments will be one of the factors to change the market from 40G to 100G, according to the report of IHS. QSFP28 is fast becoming the universal data center form factor.

100G Optical Transceiver Module

100G Optical Transceiver Module Is Much Cheaper Than Before
The cost for transceiver modules which keep adding up over time is one of the main considerations of the whole projects. In other word, the cost of the devices and components may influence the enthusiasm of network upgrade. But, in 2016, the 100G transceivers will be more affordable. On one hand, the cheap 100G silicon reaches production and the technology become mature. On the other hand, the adoption of widespread use of the 100G devices, and the vast increases in Internet traffic are core to change in the communications infrastructure markets. This reduction in pricing will lead to 100 GE selling at a price per bit transmitted below that of 10 GE in the 2018 time frame.

100G Optical Transceiver Module Is More Widely Used
Previously, 100G was primarily installed on high-end core routers and now more are being installed on relatively lower-priced edge routers, which pricing declined significantly reduces the price of 100G optical transceiver. In 2016, the global data center construction market will keep growing which means that the 100G optics application will be more wider. Geographically, North America, Europe and Asia-Pacific (mainly China) are the main market for 100G transceiver with their increasing demand for deployment of 100G equipment.

Fiberstore 100G Optical transceiver Solution
In 2015, FS.COM constantly improves the product line of fiber optic transceivers. For 100G optics, we introduced the 100GBASE-LR4 CFP2 and CFP4 modules as well as the 100GBASE-SR4 and 100GBASE-LR4 QSFP28 modules. With our serious cost control, the prices of all our 100G optics are much more affordable than the similar products in the market. Furthermore, with the mature coding technology, they can be compatible with many major brands.

FS Part Number Product Photo Description
CFP-LR4-100G CFP-LR4-100G 100GBASE-LR4 CFP 1310nm 10km Transceiver for SMF
CFP2-LR4-100G CFP2-LR4-100G 100GBASE-LR4 CFP2 1310nm 10km Transceiver for SMF
CFP4-LR4-100G CFP4-LR4-100G 100GBASE-LR4 CFP4 1310nm 10km Transceiver for SMF
QSFP28-SR4-100G QSFP28-SR4-100G 100GBASE-SR4 QSFP28 850nm 100m Transceiver for MMF
QSFP28-LR4-100G QSFP28-LR4-100G 100GBASE-LR4 QSFP28 1310nm 10km Transceiver for SMF

40GBASE-SR4/CSR4 QSFP+ Transceiver Direct Connection Cabling

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As we all know, the standard specifies MPO as a connector to the 40GBASE-SR4/CSR4 QSFP+ transceiver. To connect a QSFP+ to QSFP+, we usually use a MTP 12-fiber trunk cable. In the 40GBASE-SR transmission, there are eight fibers associated with the channel—four fibers for the TX signal and four fibers for the RX signal. Therefore only 8 of the 12 fibers are used, where the remaining four are not used, and can optionally be not present in the cable. So we can also choose a MTP 8-fiber trunk cable for connectivity. This article explains 40G QSFP+ SR4/CSR4 transceiver to 40G QSFP+ SR4/CSR4 transceiver cabling selections.

How to Choose Right  MTP Trunk Cables? 
In addition to using a MTP 8-fiber trunk cable or MTP 12-fiber trunk cable, there are a number of other factors also needed to be considered when to choose a right MTP trunk cable for 40G QSFP+ SR4/CSR4 transceiver connectivity.

  • Use single-mode or multimode MTP trunk cable?

In the market, both single-mode and multiode MTP trunk cable are available. Which one should I use? According to 40GBASE-SR4 standards, 40G QSFP+ SR4 transceiver supports link lengths of 100 meters and 150 meters, respectively, on laser-optimized OM3 and OM4 multimode fibers. Therefore, to connect a 40G QSFP+ SR4  to 40G QSFP+ SR4, we should choose OM3 or OM4 multimode MTP trunk cables.

  • MTP trunk cable polarity selection: A, B or C?

In terms of MTP trunk cable, there are three kinds of polarity options (A, B and C). Which one to choose? In fact, according to the IEEE 40GBASE-SR4 specifications, we must select a type B MTP 8-fiber or MTP 12-fiber trunk cable. The type B trunk cable has opposing connectors with both keys oriented facing up, however the fiber positions are reversed at each end i.e. the fiber at position 1 at one end is connected to position 12 in the connector at the opposing end.

Type-B-MTP-trunk-cable

  • Choose male or female MTP trunk cable?

In terms of a MPO connector, it is divided into male and female types. They ensure that the adapter holds the connector with the correct ends aligned with each other. A MPO trunk cable usually has two MPO connector on each side. Therefore, MTP trunk cables are available in male–male and female–female two versions. According to IEEE standards, MPO optics in a 40G QSFP+ SR4 transceiver are always male connectors, and therefore will always accept female MPO connectors. So if we want to connect a 40G QSFP+ SR4 transceiver  to a 40G QSFP+ SR4 transceiver successfully, we must choose a female–female MTP trunk cable.

40G QSFP+ SR4/CSR4 to 40G QSFP+ SR4/CSR4 Cabling Selections
In order to satisfy different cabling requirement, we may choose different cabling methods. And different cabling methods call for many different cabling infrastructure. Following are four type common cabling methods to connect a 40GBASE-SR4/CSR4 QSFP+ to 40GBASE-SR4/CSR4 QSFP+.

  • Direct connection for 40 Gigabit Ethernet parallel optic transceiver

When directly connecting one QSFP+ MPO/MTP interface transceiver to another, a Type-B female MPO/MTP to female MPO/MTP cable is required. This type of direct connectivity is only suggested for short distances within a given row of racks/cabinets. Following picture shows two QSFP+ transceivers being connected with a MTP female cable.

solutions_40G_pic01

Item Number FS Correlative Product Description FS Part Number
1 40GBASE-SR4 QSFP+, 850nm, 150m, MMF, MPO interface QSFP-SR4-40G
2 12 Fibers OM4, 12 Strands MTP Trunk Cable, Female to Female, Type B Polarity ( MTP/ MPO, OM4/ OM3 optional. Various lengths available) FS12OM4-2MTP-FF-B
  • 40GbE direct interconnect with MTP trunk cable and patch panel

For distances less than 400 meters, the use of FS MPO/MTP multi-mode fiber cabling is generally the preferred cabling method. The next solution is similar to the previous, but instead of using a 12-fiber jumper directly, the MPO/MTP adapter panel is interconnected. Following picture shows the distribution switch and FS optics and cabling options with corresponding item details for a QSFP+ to QSFP+ multi-mode interconnection.

solutions_40G_pic02

Item Number FS Correlative Product Description FS Part Number
1 40GBASE-SR4 QSFP+, 850nm, 150m, MMF, MPO interface QSFP-SR4-40G
2 12 Fibers OM4, 12 Strands MTP Trunk Cable, Female to Female, Type B Polarity ( MTP/ MPO, OM4/ OM3 optional. Various lengths available) FS12OM4-2MTP-FF-B
3 12 Ports MTP/MPO Fiber Adapter Panel, key-up to key-up FAP-HV-12MTPUUD
  • 10Gig migrate to 40GbE by interconnecting MTP LGX cassette and MTP trunk cable

Following picture shows one link with a breakout of the QSFP+ with the use of an MPO/MTP LGX cassette to four 10G SFP+ links. A Type-B female MPO/MTP to Female MPO/MTP assembly is used between the MPO/MTP LGX cassette and 40GbE transceiver. The connections to the SFP+ transceivers is accomplished with OM3/OM4 Uniboot LC duplex fiber patch cables.

solutions_40G_pic03

Item Number FS Correlative Product Description FS Part Number
1 10GBASE-SR SFP+, 850nm 300m, MMF, LC duplex SFP-10GSR-85
2 LC-LC Duplex 10G OM4, MMF Patch Cable OM4-LC-LC-DX-FS
3 12 Fibers OM4, LGX – MTP Cassette, MTP(male) to LC FS12OM4-LGX-2MTP-LC
4 MTP/MPO LGX Cassettes 1U/4U 19” Rack Mount FS-1RU-MX
5 12 Fibers OM4, 12 Strands MTP Trunk Cable, Female to Female, Type B Polarity ( MTP/ MPO, OM4/ OM3 optional. Various lengths available) FS12OM4-2MTP-FF-B
6 10GBASE-SR SFP+, 850nm 300m, MMF, LC duplex SFP-10GSR-85
  • 10Gig migrate to 40GbE by interconnecting MTP harness cable and MTP trunk cable

Sometimes, create a simple, cost-effective migration path by installing a structured cabling system that can support your future 40GbE networking needs. Following picture uses the 8-fiber harness as shown in the diagram to connect to 10G SFP+s. This approach allows for an easy upgrade path moving from 10Gig to 40GbE connectivity.

solutions_40G_pic04

Item Number FS Correlative Product Description FS Part Number
1 10GBASE-SR SFP+, 850nm 300m, MMF, LC duplex SFP-10GSR-85
2 8 Fibers OM4, 12 Strands MTP Harness Cable, MTP to LC, Type B Polarity ( MTP/ MPO, OM4/ OM3 optional. Various lengths available) OM4-LC-LC-DX-FS
3 12 Ports MTP/MPO Fiber Adapter Panel, key-up to key-up FAP-HV-12MTPUUD
4 Empty 1RU/4RU Rack Mount Fiber Patch Panel FMT1-E-FS
5 12 Fibers OM4, 12 Strands MTP Trunk Cable, Female to Female, Type B Polarity ( MTP/ MPO, OM4/ OM3 optional. Various lengths available) FS12OM4-2MTP-FF-B
6 40GBASE-SR4 QSFP+, 850nm, 150m, MMF, MPO interface QSFP-SR4-40G

Fiberstore provides wide brand compatible 40G QSFP+ SR4 transceivers and all kinds of MTP cables. Each fiber optic transceiver has been tested to ensure its compatibility and interoperability. Please rest assured to buy. For more information or quotation, please contact us via sales@fs.com.

Related Article: 40G Transceiver Module: QSFP+ Module And CFP Module

Do You Know about Active Optical Cable (AOC Cable)?

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Bandwidth usage is soaring, driven by the proliferation of Internet-connected devices. At this time, active optical cable (AOC cable) has emerged. Besides, the market of AOC cables keeps growing and has a broad prospect. What’s active optical cables? Why should we use it? In this article, some knowledge of active optical cables will be provided.

Introduction to Active Optical Cable (AOC Cable)
Active optical cable (AOC) is used for short-range multi-lane data communication and interconnect applications. Usually, the wire transmission of optical communication should belong to passive part, but AOC is an exception. AOC consist of multimode optical fiber, fiber optic transceivers, control chip and modules. It 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. Since people expect more information to be available at their fingertips, our communications systems will need to be quicker, and AOC is one of the best solutions to solve this problem. Compared with direct attach copper cable for data transmission, AOC provides more advantages, such as lighter weight, high performance, low power consumption, low interconnection loss, EMI immunity and flexibility. At present, AOC is widely used in many fields as well as promoting the traditional data center to step into optical interconnection.

AOC cable

Differences Between Passive/Active DAC and Active Optical Cable (AOC Cable)
Passive cabling provides a direct electrical connection between corresponding cable ends. 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. The picture below shows us the leading types of passive and active cables for data center.

Differences Between PassiveActive Copper and Active Fiber

 Why Use Active Optical Cable (AOC Cable)?
Primarily, active optical cable (AOC) assemblies were invented to replace copper technology in data centers and high performance computing (HPC) applications. As we know, copper passive twinax cable is heavy and bulky, making it difficult to physically manage the datacenter. And due to the nature of electrical signals, electromagnetic interference (EMI) limits copper’s performance and reliability. Though there are so many disadvantages of copper cable, at that time, it is the main stream while the idea of AOC cables almost seems too good to be true. However, the advantages of AOC cables make the predecessors look obsolete and unsophisticated, and changes the limitation of copper passive twinax cable as well as playing an important role in high speed data transmission. Nowadays, a variety of active optical cable have been launched in the market, such as 10G SFP+ AOCs, 40G QSFP+ to QSFP+ AOCs, 40G QSFP+ to 4 SFP+ breakout AOCs and ,40G QSFP+ to 8xLC breakout AOCs.

Active Optical Cable

Conclusion
FS.COM active optical cables achieve high data rates over long reaches which are the best solutions for high-performance computing and storage applications. We provide many AOC products such as 10G SFP+ AOCs, 40G QSFP+ AOCs, QSFP+ to 4 SFP+ AOCs, and QSFP+ to 8 x LC AOCs. In addition, customized active optical cables are available in various lengths, Cisco compatible and other options. For more detailed information, please visit www.fs.com or contact us over sales@fs.com.

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QSFP+ and QSFP28 Transceivers Cabling Solutions

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Active Optical Cable (AOC) – Rising Star of Telecommunications

What Is the Difference Between Singlemode QSFP+ and Multimode QSFP+?

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The singlemode and multimode QSFP+ here mean the transceivers which work at different types of optical fibers, ie singlemode type will work with singlemode fiber, while multimode one will work with multimode fiber. So, what’s the different between them? And what should we notice when using them? Which one should I choose? In this article, we will have a discussion around this topic.

Singlemode vs. Multimode QSFP+

  • Singlemode

Singlemode fiber (SMF) has much tighter tolerances for optics used. The core is smaller and the laser wavelength is narrower. This means that SMF has the capability for higher bandwidth and much longer distances in transmission. Singlemode QSFP+ works mainly in 1310nm wavelength and is mostly used in long distances transmission. There are many different types of them, and different type can achieve different transmission distance, such as 500m, 1km, 2km, 10km and 40km. he color of compatible fiber optic patch cord is yellow. SMF QSFP+ usually uses duplex LC connector, but there also are some types use MPO/MTP connector.

Singlemode QSFP+

  • Multimode

Multimode fiber (MMF) uses a much bigger core and usually uses a longer wavelength of light. Because of this, the optics used in MMF have a higher capability to gather light from the laser. In practical terms, this means the optics are cheaper. The common multimode QSFP+ works in 850nm wavelength and is only used for short distance transmission reaching 100m and 500m. Though it’s not able to transport for long distance, it can transport many kind of optical signals. It usually uses MPO/MTP connector, but some SMF&MMF ones can also use duplex LC connector.

Multimode QSFP+

Choose a Singlemode or Multimode QSFP+?
SMF and MMF QSFP+ may have different transmission distance and connectors, which is the most important factors you should consider when to make a decision. In the table below, I display the specifications of some main SMF and MMF 40G modules. Hope to help you to choose the right one for your network.

Type Wavelength Fiber and Distance Connector Original model
40GBASE-SR4  4x850nm 100m(OM3) 150m(OM4) Male MPO Cisco 40G-SR4
40GBASE-CSR4  4x850nm 300m(OM3) 400m(OM4) Male MPO Cisco 40G-CSR4
40GBASE-LX4  1270,1290,1310,1330 nm 100m(OM3) 150m(OM4) 2km(SMF) Duplex LC Juniper JNP-QSFP-40G-LX4
40GBASE Universal  1270,1290,1310,1330 nm 150m(OM3) 150m(OM4) 500m(SMF) Duplex LC Arista QSFP-40G-UNIV
40GBASE-PLRL4  4x1310nm 1km(SMF) Male MPO Arista QSFP-40G-PLRL4
4x10GBASE-LR Lite 4x1310nm 2km(SMF) Male MPO Finisar FTL4P1QL1C
40GBASE-LR4  1270,1290,1310,1330 nm 10km(SMF) Duplex LC Cisco 40G-LR4
40GBASE-LR4-Lite 1270,1290,1310,1330 nm 2km(SMF) Duplex LC Finisar FTL4C1QL1C
40GBASE-LRL4  1270,1290,1310,1330 nm 1km(SMF) Duplex LC Arista 40G-LRL4
40GBASE-PLR4  4x1310nm 10km(SMF) Male MPO Arista 40G-PLR4
40GBASE-ER4  1270,1290,1310,1330 nm 40km(SMF) Duplex LC Cisco 40G-ER4

What Should We Notice When Using Singlemode & Multimode QSFP+

  • Ensure that the transceiver in both ends of the fiber patch cord are of the same wavelength. A simple method is that the color of the modules must be consistent.
  • In general, to ensure the data accuracy, short-wave QSFP+ modules use with multimode fibers (ie. aqua OM3 or OM4 fiber patch cord), while long-wave modules use with single-mode fiber (ie. yellow fiber patch cord).
  • Do not over bend or winding fiber optic cables when using them. This will increase the attenuation of light in transit.
  • If you don’t use this module, you must use the dust plug to protect the optical bore.

When we choosing the QSFP module, we must confirm the transmission distance and wavelength we want to use in. This will help us to choose the right QSFP modules more efficiently. In addition, the costs for transceiver modules which keep adding up over time will be a budget pressure for many users. To save more, we can choose the compatible module without sacrificing any quality or reliability but only with a low cost. Fiberstore, an excellent supplier, supplies 100% compatible fiber optic transceiver modules of many brands, such as Cisco, HP, Juniper, Brocade, Finisar etc. with a incredible discount that may be a good choice for you.

Related Article: QSFP BiDi – 40GbE Over LC Duplex Multimode Fiber

40G Network Connectivity Solutions

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High speed and wide bandwidth demands drive data centers to consolidate into more complex systems. The speed of data center now is increasing to 40G and eventually to 100G. How to achieve 40G connectivity? In fact, we need some new optical technologies and cabling infrastructure. In this post, I will introduce some commonly used qsfp and qsfp cable for 40G connectivity.

40G QSFP Modules
As we know, fiber optic transceiver is an electronic device that 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 the key component in fiber optic transmission. The basic interface of 40G pluggable optical modules are 40GBASE-LR4 and 40GBASE-SR4 in QSFP+ form factor.

40G QSFP+

1. 40GBASE-SR4 QSFP+
40GBASE-SR4 transceivers are used in data centers to interconnect two Ethernet switches with 8 fiber parallel multimode fiber OM3/OM4 cables. It can support the transmission distance up to 100 m with OM3 fiber and 150 m with OM4 fiber. The optical interface of 40GBASE-SR4 is MPO/MTP. This module can be used for native 40G optical links or in a 4x10G mode with parallel to duplex fiber breakout cables for connectivity to four 10GBASE-SR interfaces.

2. 40GBASE-LR4 QSFP+
40GBASE-LR4 QSFP+ transceiver support with a link length up to 10 kilometers over 1310 nm 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. It is most commonly deployed between data-center or IXP sites with single-mode fiber.

QSFP+ Cables
QSFP+ cable is designed to meet emerging data center and high performance computing application needs for a short distance and high density cabling interconnect system capable of delivering an aggregate data bandwidth of 40Gb/s. QSFP+ cables are suitable for very short distances and offer a highly cost-effective way to establish a 40G link between two switches within racks and across adjacent racks. These high speed cables provide a highly cost-effective way to upgrade from 10G to 40G or 40G to 40G interconnect connection.

1. Passive and Active Direct Attach Copper Cables
The 40g passive or active direct attach copper cables (DAC) are designed with twinax copper cable and terminated with QSFP+ connectors. The main difference between passive DAC and active DAC is that the passive one is without the active component. Therefore, active QSFP+ DAC can achieve a longer transmission distances than passive QSFP+ cable.

0.5m(1.6ft)-passive-40gbase-qsfp+-dac

2. Active Optical Cable (AOC cable) 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 cable are popular with users.

10m(32.8ft)-40gbase-qsfp+-to-qsfp+-aoc

MPO/MTP Cable Series
Since 40GBASE-SR4 and 40GBASE-CSR4 both use MPO/MTP connector. Therefore, in addition to fiber optic transceivers and direct attach cables, MTP cabling series usually needed to achieve 40G connectivity. This series 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.

MPOMTP Cabling Series

Fiberstore offers a comprehensive solution for 40G network connectivity. What’s more, products such as 40GBASE-LR4 and 40GBASE-SR4 modules are in stock and can shipped in 12hrs. For more information, please visit www.fs.com.

Related article: Do You Know about Active Optical Cable (AOC Cable)