DAC cable BlueOptics R9F93A SFP28 25Gbps passive twinax copper direct-attach

BlueOptics R9F93A is a passive twinax DAC cable with SFP28 connectors engineered for 25 Gbps short-reach links. It provides a direct-attach copper connection between SFP28 ports in switches, network interface cards and storage devices, offering a low-latency, power-efficient alternative to active modules and optical transceivers where fiber cabling is unnecessary. The cable is intended for short horizontal and rack-level interconnects in data centers and server rooms that require reliable 25Gbps connectivity.

Advantages

The passive twinax design delivers consistent 25 Gbps throughput with minimal latency and reduced power consumption compared with active optical solutions. Being a direct-attach copper cable, it eliminates the need for separate transceivers and fiber patching, simplifying installation and lowering component count. The SFP28-form factor ensures compatibility with SFP28 ports in modern switches, NICs and storage appliances, while the copper medium provides robust performance for short distances commonly found inside racks and between adjacent racks.

Suitable for

• Short-reach connections between SFP28 ports in data center switches
• Direct links from servers or NICs to top-of-rack switches
• Interconnects in rack-to-rack or shelf-to-shelf deployments within the same room
• High-density environments that require low-latency, power-efficient cabling

Key specifications

• Connector type: SFP28 direct-attach
• Media: passive twinax copper
• Data rate: 25 Gbps
• Typical use: short-reach, rack-level interconnects
• Form factor compatibility: SFP28 ports on switches, NICs and storage devices

How to use

Install the cable by inserting each SFP28 connector into the corresponding SFP28 port on network equipment until the latch engages. Ensure both ends are compatible with SFP28 ports and that the connected devices support 25 Gbps operation. Route the cable to avoid sharp bends and excessive tension; maintain slack for maintenance access. No external power is required for the passive twinax DAC, and because it is a direct-attach solution there is no separate transceiver to install.

Usage recommendations

For reliable performance, use this passive DAC for short intra-rack or adjacent-rack links where distances fall within the cable’s supported range, avoid repeated unplugging which can wear connector latches, and follow equipment vendor guidance for supported DACs to ensure compatibility with switch and NIC firmware.