Monthly Archives: March 2016

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