Wiitek MCP1650-V00AE30 200GbE QSFP56 0.5m Passive Copper Twinax Cable

Direct-attach copper for 200GbE links

This passive QSFP56 twinax cable connects two 200GbE ports over a 0.5m reach using four 50Gb/s PAM4 lanes. It targets data-centre operators who need deterministic, low-latency links between switches, servers or storage nodes without the cost and power draw of optical modules. The 30AWG construction keeps the assembly lightweight for dense patch-panel routing. No transceivers or configuration are required — just insert and go.

Replaces active optics for short runs

When the link distance stays within half a metre, this DAC removes the need for two 200G optical transceivers and a patch cord, cutting both capital spend and per-port power below 0.1W. The jump is worth it whenever the rack layout keeps endpoints close enough for copper, especially in spine-leaf pods or DGX Spark dual-system clusters where every watt and dollar counts. For longer reaches the passive design cannot meet signal-integrity targets, so active or optical media become necessary.

Limited by passive copper physics

The cable complies with QSFP56 MSA SFF-8665 and IEEE 802.3bj/802.3cd, but passive twinax cannot equalise the channel beyond very short distances. Insertion loss and crosstalk rise sharply past the specified reach, so the practical limit is the 0.5m length shipped. It also cannot compensate for poor connector mating or contaminated end-faces, which will degrade the 100% factory-tested margin. Buyers who need metre-scale or cross-aisle links must choose active copper or optics instead.