Cablu direct attach ALLNET ALL4779-2 25G SFP28, 2m

High-density 25 Gigabit Ethernet links between switches, servers and storage arrays often fail because of fragile optical modules, dirty fiber connectors and separate transceivers that add cost and latency. The ALLNET ALL4779-2 removes those failure points with a single, factory-terminated twinax copper assembly that plugs directly into SFP28 ports on both ends.

Who is it for

Data center operators, network engineers and system integrators who need a reliable, low-latency 25GbE interconnect for top-of-rack switching, server-to-switch uplinks or storage networking over short distances. It is a practical alternative to two SFP28 optics and a fiber patch cord when the link length is 2 meters or less.

Main features

• Direct Attach Cable (DAC) with SFP28 connectors on both ends
• 25 Gbit/s data rate for 25 Gigabit Ethernet (IEEE 802.3by)
• 2 meter passive twinax copper cable, 30 AWG
• Hot-pluggable SFP28 form factor, 100 Ohm impedance
• Low power consumption: powered by host 3.3V, no external supply
• PVC jacket, operating temperature 0°C to 70°C

Specifications

• Product type: Direct Attach Cable (DAC)
• Cable type: Twinax copper, passive
• Connector A: SFP28
• Connector B: SFP28
• Data rate: 25 Gbit/s
• Length: 2 m
• Wire gauge: 30 AWG
• Impedance: 100 Ohm
• Protocol: 25 Gigabit Ethernet (IEEE 802.3by)
• Compliance: SFF-8402 (SFP28 MSA)
• Operating temperature: 0°C to 70°C
• Storage temperature: -40°C to 85°C
• Jacket material: PVC

Tips

Because this is a passive DAC, it consumes almost no power and adds negligible latency, but it is intended for short reaches only. Verify that both devices have SFP28 ports and that the vendor does not restrict third-party DACs. For longer distances, use active optical cables or fiber transceivers.