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Grey 2 metre passive copper cable with QSFP56 connectors at each end

Mellanox Technologies

Mellanox Technologies Q56-200G-CU2H 2 in 1 accessory

SKU CH-T5R7-HS4AR MPN Q56-200G-CU2H

A 2-metre QSFP56 passive copper cable delivering 200 Gbps over four 50 Gbps PAM4 lanes with 26 AWG conductors and a 39 mm to 45 mm bend radius

  • 200 Gbps throughput via 4×50 G PAM4 lanes
  • Passive twinax copper keeps latency low and power draw minimal
  • QSFP56 connectors on both ends for direct 200 G links
  • 2 m reach fits standard rack-to-rack spacing
  • 26 AWG conductors with 39–45 mm bend radius for tidy routing

Mellanox 200Gbps QSFP56 Active Optical Cable

The Mellanox Q56-200G-CU2H provides a 200Gbps link over a two-metre QSFP56-to-QSFP56 cable. It targets data-centre operators and high-performance computing clusters that need short-reach, high-bandwidth interconnects between switches, routers or servers. The assembly uses 4x 50G PAM4 modulation to reach the rated throughput.

Practical limits of the 200Gbps PAM4 interface

The link operates at 200Gbps using four 50G PAM4 lanes, so both ends must support that electrical specification and forward-error-correction mode. Passive twinax copper construction restricts reach to the supplied two metres; longer runs require active optical alternatives. Minimum bend radius sits between 39mm and 45mm, so tight cable-management channels must respect that curve to avoid signal degradation.

Installation notes and common pitfalls

The QSFP56 connectors insert with a positive latch; align the key and push until it clicks, then secure the bail latch if the port requires it. Typical 26 AWG conductors make the cable somewhat stiff, so route it with gradual bends rather than sharp corners. The most frequent issue is incomplete seating or exceeding the minimum bend radius, both of which cause link errors or complete loss of signal.

Highlights

  • 200 Gbps throughput via 4×50 G PAM4 lanes
  • Passive twinax copper keeps latency low and power draw minimal
  • QSFP56 connectors on both ends for direct 200 G links
  • 2 m reach fits standard rack-to-rack spacing
  • 26 AWG conductors with 39–45 mm bend radius for tidy routing

Specifications

No published specifications for this item yet.

Questions about this item

Should I choose the 200 Gbps 2 m QSFP56 cable or a different length for my rack?

The 2 m length suits adjacent rack connections; select a longer cable only if the link spans more than two metres.

What does the 200 Gbps rating deliver when the cable is installed in a switch?

It provides four lanes of 50 G PAM4 signalling, giving 200 Gbps aggregate throughput between two QSFP56 ports.

How does the QSFP56 interface limit the link in practice?

The QSFP56 connectors cap the link at 200 Gbps using 4×50 G PAM4 lanes; the 26 AWG copper construction requires a 39 mm to 45 mm minimum bend radius.

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