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40G QSFP+ Direct Attach Copper Cables

With the wide deployment of 40 Gigabit Ethernet, the 40G QSFP+ direct attach copper cables are becoming more and more popular due to the compact size, low power and cost-effectiveness. 40G QSFP+ to QSFP+ direct attach copper cables and 40G QSFP+ to 4 x 10G SFP+ direct attach copper cables are hot pluggable and parallel passive / active copper cables for storage, data, and high-performance computing connectivity.

QSFP+ to QSFP+ Direct Attach Copper Cables

QSFP+ to QSFP+ direct attach copper cables are hot-removable and hot-insertable. A 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 40 Gbps. QSFP+ to QSFP+ direct attach copper cables are suitable for very short distances and offer a highly cost-effective way to establish a 40G link between QSFP+ ports of QSFP+ switches within racks and across adjacent racks. These cables connect to a 40G QSFP port of a switch on one end and to another 40G QSFP port of a switch on the other end.

EX-QSFP-40GE-DAC-50CM

QSFP+ to 4 SFP+ Direct Attach Copper Cables

The move from 10G to 40G Ethernet will be a gradual one. It is very likely that one may deploy switches that have 40G Ethernet ports while the servers still have 10G Ethernet ports. For that situation, we should use a QSFP+ to 4 SFP+ direct attach breakout copper cable. These cables connect to a 40G QSFP port of a switch on one end and to four 10G SFP+ ports of a switch on the other end, which allows a 40G Ethernet port to be used as four independent 10G ports thus providing increased density while permitting backward compatibility and a phased upgrade of equipment.

QSFP-4SFP10G-CU1M

Directions for Use

The 40G QSFP+ direct attach copper cables are used to connect switch to switch or switch to server. When we use a fiber optic transceiver and patch cable to establish a fiber link, we should firstly plug the transceiver to the switch and then plug the patch cable to the transceiver. But for a QSFP+ direct attach copper cable, both SFP+ connector and QSFP+ connector can be directly inserted into the switch and don’t need a transceiver at all, which provides a really cost-effective solution for interconnecting high speed 40G switches to existing 10G equipment or 40G switches to 40G switches.

40G-QSFP-Direct-Attach-Breakout-Copper-Cable

40G QSFP+ direct attach copper cables can provide inexpensive and reliable 40G speed connections using copper cables with distances reaching up to 30ft (~10 meters length). Cost of short reach connectivity is significantly reduced by avoiding the more costly fiber transceivers and optical cables. As the main fiber optical manufacturer in China, Fiberstore provides a good selection of 40G QSFP+ copper cables, both passive and active copper cables are available. For longer distances, active copper or optical cables are required. For more information or quotation, please contact us via sales@fs.com.

Publicerat klockan 03:24, den 17 februari 2016
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High Speed Ethernet Cabling

There is a variety of types of cables and transceiver modules available for making Ethernet connections at speeds of 1Gigabit per second and above. This article will introduce the widely used optical transceivers and cables for 1-Gigabit, 10-Gigabit and 40-Gigabit connections.

1-Gigabit Connections
  • Transceivers
    Optical fiber connections are constructed with a combination of a transceiver (sometimes called a GBIC – for GigaBit Interface Converter). The transceiver accepts digital signals from the Ethernet device (switch or adapter card) and converts them to optical signals for transmission over the fiber. Although a number of different form factors for this GBIC have been defined by standards bodies, the most common is the SFP (Small Form Factor Pluggable Transceiver). The term GBIC initially was used for a specific form factor, but with the widespread adoption of the smaller SFP standard form factor, the term GBIC has fallen into the vernacular as a general term for an optical transceiver.
  • Cables
    The most commonly used cable for 1Gbps Ethernet is the Category 5 (Cat5) cable with an RJ45 connector on either end. This cable can handle connections of up to about 100 M in length. For longer connections an optical fiber cable can be used.
10-Gigabit Connections

For 10-Gigabit Ethernet cabling the fiber options are very similar. The transceivers are somewhat different, as is some nomenclature. New possibilities have evolved for copper connections.

  • Transceivers
    Standards bodies initially offered several options for the 10-Gigabit transceiver. The one that ultimately evolved as most popular in commercial data center usage was the XFP transceiver. XFP stands for 10–Gigabit Form Factor Pluggable. In recent years an extension of the SFP transceiver was standardized for use with 10 Gigabit Ethernet and named SFP+. SFP+ has the same mechanical characteristics as the the SFP transceiver – it just is capable of supporting the higher speed (some, but not all, SFP+ transceivers can actually operate at either 1Gbps or 10Gbps). The advantage of SFP+ was that it was smaller than the XFP form factor allowing for much more dense packaging of ports on switches.
  • Fiber Cables
    10-Gigabit Ethernet fiber connections use the same optical fiber types as 1-Gigabit Ethernet. The range is less due to the higher speed and the names are similar:
    Short Range: SR -for connections of up to 300 M in length
    Long Range: LR –for connections of up to 2,000 M (2 KM) in length.
    A new option is also available, though rather rarely used:
    Extended Range: ER – for connections of up to 10,000 M (10 KM) in length.
40-Gigabit Connections
  • Transceivers
    40 Gigabit optical transceivers mainly include CFP transceiver and QSFP transceiver. The most common types of QSFP/QSFP+ optical transceivers are QSFP-40G-PLR4, QSFP-40G-CSR4, 40GBASE-PLRL4, QSFP-40G-LR4, and QSFP-40G-SR4. For example, Juniper JNP-QSFP-40G-LR4 compatible 40GBASE-LR4 QSFP + transceiver from Fiberstore provides 4 CWDM lanes in 1310nm and achieves a transmission distance of 10km over single mode fibers.
  • Cable Assemblies
    Cables used in 40 Gigabit Ethernet mainly include passive and active direct attach copper cables and active optical cable (AOC). The QSFP+ passive or active direct attach copper cables are designed with twinax copper cable and terminated with QSFP+ connectors. For instance, Cisco QSFP-4SFP10G-CU1M compatible QSFP+ to 4SFP+ passive copper cable is suitable for very short distances and offer a very cost-effective way to establish a 40-gigabit link between QSFP port and SFP+ port of Cisco switches within racks and across adjacent racks. The main difference between passive QSFP+ DAC and active QSFP+ DAC is that the passive one is without the active component. AOC is used for short-range multi-lane data communication and interconnect applications. 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.

As the main fiber optical manufacturer and supplier in China, Fiberstore offers a full range of optical transceivers, such as SFP+ transceiver, X2 transceiver, XENPAK transceiver, XFP transceiver, SFP transceiver, GBIC transceiver, CWDM/DWDM transceiver, 40G QSFP+ & CFP, 3G-SDI video SFP, WDM Bi-Directional transceiver and PON transceiver. All our fiber transceivers are 100% compatible with major brands like Cisco, HP, Juniper, Nortel, Force10, D-link, 3Com.

Publicerat klockan 02:36, den 18 januari 2016
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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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