The Introduction of Direct Attach Copper (DAC) Cable
The direct attach copper or DAC cable is is a dual-coaxial copper cable that directly connects a port (or line card) in an active device (such as a switch, router, server, or data storage device) in a data network. It is a low-cost short-range connection solution that replaces optical consceivers. It consists of cables and transceivers at both ends of the cable. The price is much cheaper than similar types of optical consceivers. It is used for short-distance connection between network equipment.
To further understand their advantages, let's discuss in detail about what is a direct attach copper (DAC) cable and how to use them.
What is a Direct Attach Copper (DAC) Cable?
The DAC cable is made of twin-core copper and is terminated at the factory with optical module consceiver that directly connect electrical connections to active equipment. The optical consceiver cannot be removed from the cable, so the length of all DAC cables is fixed. This is one of the disadvantages of using a DAC cable compared to using a combination of fiber optic cable and optical transceiver.
There are different types of high-speed DAC cables: direct and branch, passive and active. A direct attach DAC cable connects one port or line card to another. A branch DAC cable to connect one port to up to 4 other ports. An active DAC cable will provide a slightly longer transmission distance than a passive DAC cable because it uses electronics at both ends of the modules to enhance the signal.
The most Common DAC Cables are 10G SFP+ to SFP+ DAC cable, 40G QSFP+ to QSFP+ DAC cable, 100G QSFP28 to QSFP28 DAC cable and 25G QSFP28 to 4 SFP28 DAC branch cable.
Direct Attach Copper (DAC) Cables are basically silver-plated conductors and foamed insulated core wires, which have excellent attenuation performance and low delay performance, so that signal transmission is correct and transmission speed is increased. At the same time, DAC cables have become the first choice for high-speed data communication solutions with many advantages such as high cost performance, high efficiency, high speed, high recombination, and low loss.
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