- IT Support
How to Switch IT Support Providers Without Downtime
2 Dec, 2025

£109.14 inc. VAT
AI-generated summary
If you’re running an InfiniBand setup that actually supports **passive QSFP DAC**, this is the kind of cable you just “buy and forget” about. The appeal of a short **1.25m** passive link is that it’s usually **reliable, low-latency, and cost-effective** versus going down the active/fibre route—especially in a rack where you’re not trying to span long distances. For a UK B2B environment, it’s the sort of spare you want on hand for swaps and maintenance because these links are critical and downtime gets expensive fast.
That said, it’s only worth £90.95 if you’re confident it will work with your exact optics/cabling plan—**passive DACs are not universally compatible**, and InfiniBand hardware is pickier than Ethernet. If you’re unsure whether your end devices require active DAC, a different connector standard, or fibre, don’t buy this “just to try”; you’ll burn time and money. In short: **buy it for data-centre racks where you know the distance and standards**, and **skip it if your deployment is still uncertain or you need longer runs**.

Lenovo
Lenovo - Network cable - RJ-45 (M) to RJ-45 (M) - 60 cm - blue - for ThinkSystem NE2580O RackSwitch

STARTECH
StarTech.com Juniper EX-SFP-10GE-DAC-5M Compatible 5m 10G SFP+ to SFP+ Direct Attach Cable Twinax, 10GbE SFP+ Copper DAC 10 Gbps Low Power Passive Mini GBIC/Transceiver Module DAC Cable - Lifetime Warranty (EXSFP10GEDA5) - 10GBase direct attach cable - SFP+ latched to SFP+ latched - 5 m - twinaxial - SFF-8431/SFF-8432 - passive - black

STARTECH
StarTech.com Dell EMC DAC-SFP-10G-2M Compatible 2m 10G SFP+ to SFP+ Direct Attach Cable Twinax, 10GbE SFP+ Copper DAC 10 Gbps Low Power Passive Mini GBIC/Transceiver Module DAC, SFP Plus - Lifetime Warranty (DACSFP10G2M) - 10GBase direct attach cable - SFP+ (P) latched to SFP+ (P) latched - 2 m - twinaxial - passive

STARTECH
StarTech.com Cisco SFP-H10GB-CU5M Compatible 5m 10G SFP+ to SFP+ Direct Attach Cable Twinax, 10GbE SFP+ Copper DAC 10Gbps Low Power Passive Mini GBIC/Transceiver Module DAC, 10G SFP+ Cable - Lifetime Warranty (SFPCMM5M) - Direct attach cable - SFP+ to SFP+ - 5 m - twinaxial - for P/N: PEX10000SFPI, PEX10GSFP4I, PEX20000SFPI