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40 Gigabit Ethernet Solution

To support the changing and fast-growing bandwidth Demands of data centers, the IEEE published the IEEE 802.3ba standard for 40 Gigabit Ethernet in June 2010. 40 Gigabit Ethernet is a standard That enables the transfer of Ethernet frames at speeds of up to 40 gigabits per second (Gbps), allo wing 40 Gigabit Ethernet-enabled equipment to handle traffic at the aggregation and core layers. A right and cost-effective solution for 40 gigabit Ethernet is very Necessary data center communications. This article will Introduce some types of cables and optical transceivers used in 40 Gigabit Ethernet.

The Cable Applied in 40 Gigabit Ethernet can be optical fiber or copper cable. With regard to cabling, OM3 or OM4 is optimal for the 40 Gigabit Ethernet or 100 Gigabit Ethernet data center environment. The major difference is in the maximum span distances. In a 10 Gigabit Ethernet network, OM3 fiber can span up to 300m while OM4 supports even longer channels. In a 40 Gigabit Ethernet or 100 Gigabit Ethernet environment, OM3 can be used up to 100m and OM4 up to 150m, of according to IEEE802.3ba standard. For applications approaching 150m, the cable Should be terminated with low-loss connectors.

Besides, the MPO (Multi-fiber Push On) / MTP (Multi-fiber Termination Push-on) cable is Considered the best solution for 40GbE. It can connect the multimode transceivers to support the Multi-Fibre optics parallel channels. For 40 Gigabit Ethernet, we can use 8 fiber MPO / MTP harness cables or 12 fiber MPO / MTP trunk cables. The ice forms Directly to connect a gate to other QSFP 4 SFP + port. The latters ice to Directly Connect One QSFP port to another QSFP port.

MPO / MTP

40 Gigabit Ethernet transceivers Mainly include CFP transceiver and QSFP transceiver.

CFP transceiver, Which has 12 transmit and 12 receive 10-Gbps lanes, one can support 100 Gigabit Ethernet port, or up to three 40 Gigabit Ethernet ports. This module is used for 40GBASE-SR4, 40GBASE-LR4. The former is based on 850nm technology and supports transmission over at least 100m OM3 parallel fiber and at least 150m OM4 parallel fibers, while the latters is based on 1310nm, coarse wave division multiplexing (CWDM) technology and supports transmissions over at least 10km on single mode fiber.

QSFP Transceiver Provides four transmit and four receive lanes to support 40 Gigabit Ethernet applications for multimode fiber and copper today. QSFP transceivers 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 direct attach cable is an assembly of four full-duplex lanes, where each lane is Capable of Transmitting data at rates up to 10Gb / s, Providing an aggregated rate of 40Gb / s. For example, CISCO QSFP-4X10G-AOC10M compatible QSFP + to 4SFP + direct-attach cable is suitable for very short distances and offers a very cost-effective way to Establish a 40-Gigabit link between QSFP port and SFP + port of the Cisco switches within racks and across adjacent racks.

Fiber Store offers a comprehensive solution for 40 Gigabit Ethernet. We have a wide range of 40G optical transceivers Which are 100% compatible with many famous brands, like Finisar QSFP + and HP QSFP + transceivers. Besides, We also Provide high-quality and cost-effective cables Such as MTP trunk cables, MTP cassettes, LC to MTP jumpers, etc.

Publicerat klockan 09:51, den 15 januari 2016
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Postat i kategorin Okategoriserat och taggat som qsfp-4x10g-aoc10m, finisar qsfp+, mpo, mtp,

Things You Need to Know About Direct Attach Cables

A direct attach cable (DAC) is a fixed assembly that is purchased at a given length, with the connector modules permanently attached to each end of the cable. The direct attach cable is designed to use the same port as an optical transceiver, but compared with optical transceivers, the connector modules attached to the DAC leave out the expensive optical lasers and other electronic components, thus achieving significant cost savings and power savings in short reach applications.

Types of DAC

The direct attach cable can be divided into different types according to different criteria. According to the cables used, the direct attach cables include copper cable assemblies and fiber optic cable assemblies. Besides, DAC cable assemblies can also be classified into 10G SFP+ cables, 40G QSFP+ cables, and 120G CXP cables according to the data rate supported by different connector modules.

What’s more, we can also divide the DAC according to the number of connectors on the end of the cable. Most DAC assemblies have one connector on each end of the cable. But there is a special kind of DAC assembly which may have 3 or 4 connectors on one end of the cable. For instance, Cisco QSFP-4SFP10G-CU1M compatible QSFP+ to 4SFP+ passive breakout copper cable from Fiberstore has a single QSFP + module rated for 40-Gbps on one end and four SFP + modules, each rated for 10-Gbps, on the other end.

QSFP-4SFP10G-CU1M

Direct Attach Copper Cable vs. Active Optical Cable

Direct attach copper cable is interchangeable and hot swappable with fiber optic modules. It supports such multiple protocols as Gigabit & 10G Ethernet, 8G FC, FCoE and InfiniBand, direct attach copper cable is a cost effective solution over optical transceivers. The defect of direct attach copper cable is that it is heavy and bulky, making it difficult to be managed. Furthermore, due to the nature of electrical signals, direct attach copper cable is vulnerable to the effects of electromagnetic interference (EMI), such as undesirable responses, degradation, or complete system failure.

Since the optical fiber is a kind of dielectric (not able to conduct electric current), AOC is also immune to EMI. Compared with direct attach copper cable, the drawback of AOC is that it may be a little expensive for customers. With the benefits of AOCs, such as lighter weight, high performance, low power consumption, low interconnection loss, EMI immunity, AOCs are now considered as the rising star of in telecommunications. For example, QSFP-4X10G-AOC10M from Fiberstore is suitable for very short distances and offers a very cost-effective way to establish a 40-gigabit link between QSFP ports of Cisco switches within racks and across adjacent racks.

Fiberstore DAC Solutions

Fiberstore offers a variety of high speed interconnect DAC assemblies including 10G SFP+ cables, 40G QSFP+ cables, and 120G CXP cables to satisfy the demands from 10G to 100G interconnection. All of the Fiberstore’s direct attach cables can meet the ever growing need to cost-effectively deliver more bandwidth, and they can also be customized to meet different requirements.

Publicerat klockan 09:17, den 4 januari 2016
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How Much do You Know About DAC

With the economics-driven growth of fiber communication networks over the past few decades, there is an increasing demand for cables which can provide a lower-power means for operation on short fiber optic links or short copper connections such as the direct attach cables (DAC) that will be described in this article.

What is DAC

A direct attach cable (DAC) is a fixed assembly that is purchased at a given length, with the connector modules permanently attached to each end of the cable. The direct attach cable is designed to use the same port as an optical transceiver, but compared with optical transceivers, the connector modules attached to the DAC leave out the expensive optical lasers and other electronic components, thus achieving significant cost savings and power savings in short reach applications.

Types of DAC

According to the cables used, the direct attach cables include copper cable assemblies and fiber optic cable assemblies. Besides, DAC cable assemblies can also be classified into 10G SFP+ cables, 40G QSFP+ cables, and 120G CXP cables according to the data rate supported by different connector modules.

In addition, direct attach copper cable can be divided into active and passive versions. In the active direct attach copper cable, there are signal processing electronics in the modules to improve signal quality and provide a longer cable distance. Otherwise, direct attach copper cable is considered passive. However copper cable is heavy and bulky, in order to overcome the disadvantages, active optical cable (AOC) assembly is booming in the market. AOC provides more advantages, such as lighter weight, high performance, low power consumption, low interconnection loss,etc. Take Cisco QSFP-4X10G-AOC10M compatible QSFP+ to 4SFP+ breakout AOC for example, it offers a very cost-effective way to establish a 40-gigabit link between QSFP port and SFP+ port of Cisco switches because of the low power consumption and high performance.

What’s more, we can also divide the DAC according to the number of connectors on the end of the cable. Most DAC assemblies have one module on each end of the cable. But there is a special kind of DAC assembly which may have 3 or 4 modules on one end of the cable. For instance, Cisco QSFP-4SFP10G-CU1M compatible QSFP+ to 4SFP+ passive breakout copper cable from Fiberstore has a single QSFP+ module rated for 40-Gbps on one end and four SFP+ modules, each rated for 10-Gbps, on the other end.

QSFP-4SFP10G-CU1M

Directions for Use

A direct attach cable is used to connect one mobility access switch with another when forming a stack. Let’s take the 10G SFP+ copper connection components for example. When a SFP+ port supports a direct attach connection, all you need to do is to insert the SFP+ module on the end of the direct attach cable into the port until it latches. If we want to replace it with a direct attach fiber cable, the first step is to remove the SFP+ direct attach copper cable from the port by pulling gently on the rubber loop (see Figure1). When the port is empty, hold the SFP+ connector attached on a direct attach fiber cable by its sides and insert it into the port (see Figure2). Make sure that it clicks firmly into place.

Installation

As the main fiber optical manufacturer in China, Fiberstore provides various kinds of high speed interconnect DAC assemblies including 10G SFP+ cables, 40G QSFP+ cables, 120G CXP cables and so on. All of our direct attach cables can meet high demand to cost-effectively deliver more bandwidth, and can be customized to meet different requirements.

Publicerat klockan 07:57, den 9 december 2015
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