DAC cable CBO CBL-QSFP-40GE-PASS-0.5M 40Gbps QSFP+ passive direct-attach copper, 0.5 m

The DAC cable CBO CBL-QSFP-40GE-PASS-0.5M is a passive direct-attach copper link that provides 40Gbps connectivity over a 0.5 m QSFP+ cable. It is intended for short-reach interconnects in data center environments, enabling direct electrical connections between QSFP+ ports on switches, routers and servers without the need for separate optical transceivers. The cable supports standard 40 Gigabit Ethernet signaling over a compact, low-profile copper assembly suitable for high-density racks and top-of-rack deployments.

Advantages

This passive DAC cable delivers low latency and low power consumption compared with optical solutions that require transceivers. Its fixed 0.5 m length and QSFP+ connectors offer a reliable, plug-and-play connection that reduces component count and simplifies cabling in short-reach scenarios. The copper construction provides consistent performance for 40Gbps links while lowering acquisition and operational costs in environments where fiber optics are not required.

Suitable for

• Top-of-rack switch-to-switch connections in data centers
• Server-to-switch interconnects within the same rack or adjacent racks
• Aggregation fabrics and short-reach distribution links

Key specifications

• Interface: QSFP+ to QSFP+
• Data rate: 40 Gbps
• Length: 0.5 m (fixed)
• Type: Passive direct-attach copper (DAC)
• Purpose: Short-reach electrical interconnects for 40 Gigabit Ethernet

How to use

Insert each QSFP+ connector into the corresponding QSFP+ port on network equipment until the latch engages, ensuring correct orientation. Verify link status on the connected devices and ensure ports are configured for 40Gbps operation if required by the equipment. For safe handling, avoid bending the cable sharply at the connector heads and do not exceed the recommended minimum bend radius.

Recommendations

Use this passive 0.5 m QSFP+ DAC for short-distance connections inside racks or between adjacent racks where 40Gbps bandwidth is needed and optical transceivers are unnecessary. Ensure compatibility with host devices' QSFP+ ports and verify required port settings in the network equipment documentation before installation.