100G QSFP28 Direct Attach DAC Cables

The maximum length for passive 100G QSFP28 DAC cables is typically around 5 to 7 meters. Active DAC cables, which contain electronics to boost the signal, can reach longer lengths, sometimes up to 15 meters. However, for distances beyond this, active optical cables (AOCs) or separate transceivers and fiber are recommended.

The primary purpose of a DAC cable is to provide a reliable, low-latency, and cost-effective high-speed connection between network devices in close proximity. They are commonly used in data centers for top-of-rack (ToR) switching, connecting servers to switches, or linking switches together within the same or adjacent racks.

For short distances (typically under 7 meters), DAC cables are significantly more cost-effective and consume less power than a solution using two optical transceivers and a fiber patch cable. They offer a simpler, plug-and-play solution with very low latency, making them ideal for high-density data center environments where cost and power are major concerns.

Our DAC cables are programmed to be compatible with a wide range of OEM equipment, including major brands like Cisco, Arista, and more. We rigorously test for multi-vendor interoperability. Please provide your switch or server model, and we can confirm compatibility to ensure seamless integration into your existing network infrastructure.

A passive DAC cable contains no electronic components and simply passes the signal through the copper wire. An active DAC has signal processing circuitry within the connectors to regenerate the signal, allowing for longer cable lengths and a thinner, more flexible cable. Passive is typically used for very short links (1-3m), while active is used for longer reaches (5-10m).

Refurbished DAC cables are pre-owned units that have been professionally inspected, cleaned, and subjected to a rigorous 5-step testing process to ensure they meet or exceed original performance specifications. This provides a highly reliable, warrantied product at a significant cost savings compared to purchasing new hardware.