Cable DAC QSFP28 BlueOptics QSFP28-DAC-3M-AT-BL 3 m macho/macho

The BlueOptics QSFP28-DAC-3M-AT-BL is a 3‑metre passive Direct Attach Copper (DAC) cable with QSFP28 connectors on both ends. Designed for short-reach, high‑speed links in data centres and network racks, this 100GBase‑CR4 compliant twinax cable supports electrical transmission over a 3 m distance and is intended for connecting switches, routers, servers and storage systems that accept QSFP28 DAC modules.

Advantages

This QSFP28 DAC cable offers low latency and low power consumption typical of passive twinax assemblies, while providing a cost‑effective alternative to active optical transceivers for short links. The cable follows MSA mechanical and electrical specifications for QSFP28 interfaces, enabling interoperability across major hardware platforms. Its design uses industry‑grade components to deliver stable transmission and an expected long service life for rack‑level interconnects.

Suitable for

• 100G direct connections between adjacent racks or within the same rack
• Switch-to-switch, switch-to-router and switch-to-server links at 100GBase‑CR4
• High‑bandwidth short‑reach applications such as Ethernet, FCoE and InfiniBand

Key specifications

• Cable type: Passive QSFP28 twinax copper (DAC)
• Connector type: QSFP28 male to QSFP28 male
• Length: 3 metres
• Supported data rate: up to 100 Gbps (100GBase‑CR4)
• Wire gauge: 26 AWG twinax
• Compliance: QSFP28 MSA electrical/mechanical form factor
• Typical power consumption: passive (near 0.1 W per link when measured at system level)

How to use

Install the QSFP28 connector ends into compatible QSFP28 ports on networking equipment until they click into place. Confirm that the connected devices support passive DAC cables and the 100GBase‑CR4 protocol. No external power or configuration is required for the cable itself; link configuration and protocol settings are managed by the connected hardware and network software. After insertion, verify the link status and speed via the host device management interface.

Recommendations

Use this 3 m passive QSFP28 DAC for short‑reach in‑rack or adjacent‑rack connections where a low‑latency and cost‑effective 100G link is required. Avoid routing the cable near strong electromagnetic sources and do not bend the twinax assembly beyond the manufacturer’s minimum bend radius to preserve signal integrity.