DAC cable CBO QFX‑QSFP28‑DAC‑50CM passive copper 50 cm

Passive copper DAC cable CBO QFX‑QSFP28‑DAC‑50CM passive copper 50 cm is a direct-attach copper cable engineered for QSFP28 ports. With a 50 cm length, it offers a compact, low-latency physical link for 100GbE short-reach connections between compatible switches, routers and servers without the need for separate optical transceivers. The cable is intended for data center environments and point-to-point connections where cost-effective, reliable and power-efficient short-distance connectivity is required.

Advantages

This passive DAC cable provides a simple plug-and-play solution for high-speed links using QSFP28 interfaces. It consumes no additional power for signal conversion, reduces component count by eliminating transceivers, and lowers latency compared with optical solutions for very short distances. The fixed 50 cm length helps maintain neat cabling within racks and between adjacent devices while ensuring consistent electrical performance for 100GbE traffic.

Suitable for

• Short-reach 100GbE connections between top-of-rack switches
• Interconnects between routers and data center servers
• Point-to-point links inside server racks or adjacent racks
• Environments where low latency and reduced power consumption are priorities

Key specifications

• Connector type: QSFP28 to QSFP28 passive copper
• Length: 50 cm (fixed)
• Data rate: supports 100 Gigabit Ethernet links
• Signal medium: passive copper direct-attach
• Typical use: short-reach, within-rack or adjacent-rack connections

How to use

Install the cable by inserting each QSFP28 connector securely into the corresponding QSFP28 port on the network devices until the latch engages. Ensure devices are powered down or follow hot-plugging guidelines from the equipment manufacturer if supported. Verify the link status and interface configuration in device management software or CLI; the cable requires no separate configuration but the ports must be set to compatible speed and lane settings. Avoid excessive bending and keep the cable within recommended bend radius to maintain signal integrity.

Recommendations

Use this passive copper DAC cable for short, high-speed links up to 50 cm where optical transceivers are unnecessary. Keep the cable away from sources of electromagnetic interference and avoid repeated flexing. Confirm compatibility with device QSFP28 port firmware and vendor compatibility lists when deploying in multi-vendor environments.