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Blue passive copper twinax cable with QSFP28 connectors at both ends, 1 metre length

Wiitek

Wiitek 100GbE QSFP28 DAC Twinax Cable 1m

SKU CH-C4VY-BA2AW

Passive 100GbE QSFP28 direct-attach copper cable, 1 m, IEEE 802.3 and SFF-8665 compliant, 30AWG, 0–70 °C operation

  • Length1 m
  • 100 GbE throughput for high-density rack links
  • Passive 30 AWG copper keeps power draw minimal
  • Broad vendor compatibility simplifies mixed-switch deployments
  • IEEE 802.3 and SFF-8665 compliance ensures interoperability
  • 0–70 °C operating range suits standard data-centre environments

What This Cable Is and Who Uses It

This one-metre passive copper cable carries 100 GbE traffic between QSFP28 ports. It suits network engineers and system builders who need a short, low-power link inside a rack or between adjacent racks. The 30 AWG twinax construction meets IEEE 802.3 and SFF-8665 requirements while drawing power from a single 3.3 V supply. It is built for dense switch-to-switch or switch-to-server connections where active optics are unnecessary.

What It Replaces and When the Switch Pays Off

The cable replaces active optical cables or transceiver-plus-fibre kits for 100 GbE links up to one metre. Because it is passive, it eliminates the power draw and EMI associated with optical modules, cutting both operating cost and heat load. The jump is worth it when the link distance stays within the one-metre reach and the connected gear follows the QSFP28 MSA, letting you avoid the expense and complexity of separate transceivers.

What to Verify on Your Hardware Before Buying

Confirm that both ends present QSFP28 cages rated for 100 GbE passive copper and that the port firmware accepts third-party DACs. Check the chassis airflow direction so the blue pull-tab remains accessible for insertion and removal. Ensure the operating environment stays within the 0 to 70 degree Celsius range and that the power budget can supply 3.3 V to each port. RoHS compliance is already met, so no further material checks are needed.

Highlights

  • 100 GbE throughput for high-density rack links
  • Passive 30 AWG copper keeps power draw minimal
  • Broad vendor compatibility simplifies mixed-switch deployments
  • IEEE 802.3 and SFF-8665 compliance ensures interoperability
  • 0–70 °C operating range suits standard data-centre environments

Specifications

Length1 m

Questions about this item

Will the 30AWG 1 metre QSFP28 cable fit the port spacing on my switch?

The passive copper assembly uses a standard QSFP28 form factor and a 30AWG twinax pair, so it matches the pitch defined by the QSFP28 MSA for 100GBASE-CR links.

What is the correct way to seat the QSFP28 connectors and what step is often missed?

Align each end with the port, push straight in until the latch clicks, then verify the link LED; the step often missed is confirming the latch is fully engaged before routing the cable.

How long will the passive copper link stay reliable and when should I plan a replacement?

The cable is rated for 0 to 70 °C operation with a 3.3 V supply and carries a three-year product warranty, so plan a refresh around that period or if link errors appear.

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