QNAP CAB-DAC30M-SFP28 SFP28 25GbE Twinaxial Direct Attach Cable
Overview
The CAB-DAC30M-SFP28 is a 3.0-meter SFP28 twinaxial direct attach cable delivering 25GbE throughput between compatible QNAP NAS units, expansion enclosures, and network switches. DAC cables eliminate the transceiver-plus-fiber cost and complexity of optical 25G links for in-rack or top-of-rack connections where cable runs stay under 3 meters — the right call when you're linking a QNAP NAS directly to a 25G switch port in the same rack or adjacent rack bay. At 25GbE, this cable supports the full bandwidth headroom needed for multi-drive NAS workloads, high-throughput backup traffic, and dense video surveillance storage environments where per-camera streams aggregate quickly.
Compatibility
Designed for use with QNAP NAS devices, expansion units, and accessories equipped with SFP28 25GbE ports — including QNAP QSW-series 25G-capable managed switches and QNAP NAS models with onboard or add-in 25GbE SFP28 interfaces. The SFP28 form factor is electrically compatible with SFP+ slots at reduced speed (25G vs 10G), but verify port negotiation in your specific switch or NAS before mixing form factors. For a full view of compatible platforms, see the QNAP networking and storage catalog. If you're building out a 25G backbone for a surveillance or media storage deployment, pair this cable with a compatible 25G network switch.
Installation Notes
Passive DAC — no SFP28 transceivers required on either end; the cable terminates in integrated SFP28 connectors. Maximum usable length is 3.0M; passive DAC cables are not suited for runs beyond their rated distance (use active optical cables or SFP28 transceivers with fiber for longer spans). Ensure the SFP28 port on both ends supports passive DAC negotiation — some switch vendors require explicit DAC mode configuration. No additional power draw beyond what standard SFP28 ports supply.
