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.

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.

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.

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.

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.