DAC Cable CBO QSFP28 5m — CBO GDJDJ-BL Direct Attach Copper for 100GbE

The DAC Cable CBO QSFP28 5m — CBO GDJDJ-BL Direct Attach Copper for 100GbE is a 5‑meter passive QSFP28 copper cable designed to provide a fixed electrical connection between compatible QSFP28 ports. Intended for short‑reach links in data centers, switches and servers, the cable supports 100 Gigabit Ethernet links with low latency and plug‑and‑play installation. Its fixed copper design removes the need for transceivers and simplifies high‑density cabling in rack environments.

Advantages

This direct attach copper cable delivers low electrical latency and consistent signal integrity for short distances. The passive QSFP28 construction provides immediate compatibility with ports that accept QSFP28 DACs, enabling simplified installation without additional modules. The 5‑meter length balances reach and manageability for common rack‑to‑rack and shelf‑to‑shelf connections, reducing cable clutter and maintaining predictable performance for 100GbE links.

Suitable for

• Short‑reach 100GbE connections between switches in the same rack or adjacent racks
• Server to top‑of‑rack switch links where QSFP28 ports are available
• High‑density networking environments requiring simple, plug‑and‑play cabling
• Data center aggregation and leaf‑spine topologies with short copper runs

Key specifications

• Interface: QSFP28 to QSFP28 electrical connection
• Data rate: 100 Gigabit Ethernet
• Length: 5 meters
• Cable type: Passive direct attach copper (DAC)
• Use case: Short‑reach, fixed copper interconnect for racks and servers
• Latency: Low electrical latency suitable for high‑performance switching

How to use

Insert each QSFP28 connector into the corresponding QSFP28 port on the networking devices until the latch engages. No additional transceivers or configuration are required for systems that support passive QSFP28 DACs; the link should negotiate at 100GbE automatically when both ports support the same speed and mode. Route the cable to avoid sharp bends and excessive tension, and secure it to maintain airflow and cable management within the rack.

Recommendations

Verify compatibility with the switch and server vendor documentation for passive QSFP28 DAC support and any port‑level limitations. Use this 5m active length for intra‑rack or adjacent‑rack connections where passive copper is appropriate; for longer distances, consider optical modules or active cables. Maintain proper bend radius and avoid exposure to heat sources to preserve signal integrity and cable lifetime.