Direct Attach Cable BlueOptics 3HE08590AA 40GBASE-CR4 1 m

Direct Attach Cable BlueOptics 3HE08590AA 40GBASE-CR4 1 m is a 1‑metre passive twinax copper cable engineered for short-reach 40 Gbps links. The cable implements the 40GBASE-CR4 electrical interface and provides a direct, low-latency connection between compatible QSFP+ or QSFP28 ports on top-of-rack switches, servers and aggregation equipment in data center environments. Its fixed length and integrated connectors simplify cabling in high-density racks and reduce the need for optical transceivers for short interconnects.

Advantages

The passive twinax design offers deterministic low latency and high signal integrity for 40 Gbps connections while consuming no power for active components. A 1 m length delivers predictable reach for adjacent rack units and short top-of-rack runs, and the compact, integrated connector housings reduce port density footprint compared with separate transceiver-and-fiber assemblies. The cable is suitable for environments where predictable electrical performance and cost-efficient short-distance connectivity are priorities.

Suitable for

• Top-of-rack switch to server connections within the same rack or adjacent racks
• Switch-to-switch aggregation in short-reach data center rows
• High-density patching panels and server interconnects requiring 40 Gbps over copper
• Environments where low latency and predictable electrical performance are required

Key specifications

• Interface: 40GBASE-CR4 electrical twinax
• Connector type: QSFP family direct-attach integrated connectors
• Cable type: Passive twinax copper
• Length: 1 metre
• Data rate: 40 Gbps aggregate
• Use: Short-reach, within-rack or adjacent-rack interconnects

How to use

Insert each end of the cable into compatible QSFP-format ports on the devices to be connected until the connector latches engage. Verify link status on both devices and confirm that interface settings (40 Gbps mode and lane mapping) are configured as required by the switch or server OS. For hot-plug capable ports, the cable can be inserted or removed while equipment is powered, following vendor guidelines. Avoid excessive bending near the connectors and route the cable to prevent strain or interference from power cables.

Usage recommendations

For reliable operation, use this 1 m passive twinax cable for short, within-rack or adjacent-rack connections where 40GBASE-CR4 electrical compatibility is supported by both endpoints. Keep bend radius above manufacturer minimums, avoid sharp kinks, and ensure proper airflow and cable management in dense rack deployments. Check device compatibility lists for supported QSFP direct-attach assemblies before installation.