Optical fiber systems & Copper cabling infrastructure products | Good quality and good service based on reasonable prices.

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Fiber systems & copper cabling systems products | Good quality and good service based on reasonable prices.

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Direct Attach Cable(DAC)

Good quality and good service based on reasonable prices.

  • 10G/25G/40G/100G DAC and Breakout DAC.
  •  Digital diagnostic functions.
  • Transmit distance 1-5m,1-10m.

What are DAC cables?

DAC (Direct Attach Cable) is generally called direct cable, direct copper cable, or high-speed cable. DAC has modules at either end of the Twinax copper cable that allows direct communication between devices over copper wire. Both ends have specific connectors and the cable length is fixed.

Passive DACs are typically 7m in length or shorter and use less than 0.15W of power. Active DACs use additional power (0.5W to 1.0W) to provide better performance for longer reach applications (up to 15M) and a smaller cable diameter.

DACs are available for use in standard transceiver form factors, including

  • 10G SFP+
  • 25G SFP28
  • 40G QSFP+
  • 100G QSFP28
What are DAC cables
  • DACs can also be configured to support 4x10G and 4x25G applications. These configurations allow a 100G or 40G switch port to connect to four 10G or 25G ports. The QSFP switch port must support breakout applications and be configured by the user to support.


The DAC cable simply provides the electrical lanes for each circuit. Breakout cables are also available in passive variants up to 5 meters and active variants up to 10 meters.

Direct Attach Cable

Active Optical Cable Applications

  • DAC Cable can be widely used in data center interconnection, such as SATA storage devices, RADI systems, core routers, core switches, servers for 10G/40G/100G Ethernet, and InfiniBand.
  • Generally speaking, this direct attach copper cable provides a cost-effective and high-performance solution for the following situations:
  • Top of Rack(TOR)/Adjacent Rack – Either passive or active DAC cable is perfect for shorter TOR or rack-to-rack operations with cost-effective budgets.
  • Middle of Row – DAC cables may be a better solution in this application, as long as the transmission distance is less than 15m.
  • End of Row – DAC cables are ideal for the end of row architectures as long as the distance is within the 15 meters limit.
Active Optical Cable Applications

Active Optical Cable Applications

  • DAC cables can be classified into two types: passive DAC cables and active DAC cables.
  • Passive DAC cables have no electrical components built into the cable assembly. Hence, it has a minimal power consumption of no more than 0.15w and generally for short reach up to 7m.
  • Active DAC cables have signal amplification and equalization built into the cable assembly. Therefore, it allows a little longer transmission distance up to 15m and ensures better transmission quality. At the same time, it has a higher price and consumes more power around 0.5-1w.
Reach Cable Type Power Consumption Weight Bend Radius Application Price
Passive DAC Cable <7m Twinax Copper <0.15w Heavy 24AWG-38mm 26AWG-33mm 28AWG-25mm 30AWG-23mm TOR Middle of Row End of Row Zone-to-zon Lower
Active DAC Cable 7-15m Twinax Copper 0.15-1w Heavy Low

Why Choose DAC Cables over fiber optic transceivers?

  • Nowadays, DAC cable is very popular with the following advantages:
  • Less Power Consumption – Compared to optical transceiver modules, DAC cables, especially passive copper cables consume less power.
  • Lower Price – DAC cables are less costly for they do not need patch panels or additional cables when connected to devices as optical transceiver modules.
  • Simpler Deployment – DAC cable has only one component to be interconnected. However, the optical transceiver has to be connected with more devices, which must be matched with each other. Besides, it is convenient for installers to conserve DAC cables, they don’t need to clean and inspect optical fiber before plugging cables. 

How to select right DAC cable?

Choosing the right DAC (Direct Attach Copper) cable involves a few key considerations:

  • Length: Select a cable that matches the distance between your devices, typically suitable for up to 7 meters.
  • Device Compatibility: Ensure the DAC cable is compatible with your networking equipment, such as switches and servers.
  • Speed Requirements: Match the cable’s data rate capability (e.g., 10, 40, 100 Gbps) with your network’s speed needs.
  • Active vs. Passive: Choose passive DAC cables for shorter, cost-effective connections or active cables for slightly longer distances with signal boosting.
  • Quality and Standards: Opt for cables that meet industry standards for reliability and have features like shielding to reduce interference.
  • Cost and Vendor: Consider the cable’s price and choose a reputable vendor, balancing cost with quality.
  • Future-Proofing: Think about potential network upgrades and select a cable that can accommodate future changes.
  • Remember, DAC cables are ideal for short-range, high-speed connections, and not suitable for long distances where fiber optics are preferable.

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