DAC cable CBO QSFP28-DAC-1M 1m passive copper 100G

CBO QSFP28-DAC-1M 1m passive copper 100G is a 1‑metre direct attach copper (DAC) cable with QSFP28 connectors designed to establish 100G links between compatible network devices. The cable delivers short‑reach connectivity for data centre top‑of‑rack and aggregation environments where low latency and energy efficiency are required. It is intended for direct device‑to‑device connections such as switch‑to‑switch, switch‑to‑server or server‑to‑server within the same rack or adjacent racks.

Advantages

The passive copper construction provides stable 100G electrical signalling with minimal added latency compared with active modules. The QSFP28 form factor enables high-density ports and simple plug‑and‑play installation without additional transceivers. At 1 metre length the cable reduces power consumption and heat generation relative to active optical solutions, offering a cost‑effective option for short‑reach interconnects in rack and chassis environments.

Suitable for

• Short‑reach 100G links in data centres and server rooms
• Direct switch‑to‑switch or switch‑to‑server connections
• Top‑of‑rack and adjacent rack interconnect cabling
• High‑density port deployments where QSFP28 is supported

Key specifications

• Connector type: QSFP28 to QSFP28
• Length: 1 metre (passive copper)
• Rated speed: 100 Gigabit Ethernet
• Physical medium: passive twinax copper
• Typical use: short‑reach, direct attach interconnect
• Form factor: QSFP28 direct attach cable

How to use

Ensure both devices support QSFP28 passive DAC connections and that firmware or port settings are configured for 100G operation. Insert each QSFP28 plug fully into the corresponding port until the latch engages. Confirm link status on connected devices and monitor for proper negotiation and 100G link speed. Avoid excessive bending or stress near the connector ends and route the cable to prevent obstruction of airflow within racks.

Usage recommendations

Use this 1m passive DAC cable for short interconnects where low latency and energy efficiency are priorities. Verify device compatibility with QSFP28 passive copper cables and follow vendor guidance on supported cable lengths and port settings. For longer distances or different topologies consider optical transceivers or active DAC alternatives.