We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Lenovo Mellanox QSA 100G to 25G cable adapter with QSFP28 and SFP28 connectors

Lenovo

Lenovo Mellanox QSA 100G to 25G network ethernet cable

SKU CH-4GCS-708M4

A QSFP28-to-SFP28 cable adapter that connects a 100 Gb port to a 25 Gb link

  • CatQSFP28/SFP28
  • Connector AQSFP28 Network
  • Connector BSFP28 Network
  • Connect 100G QSFP28 ports to 25G SFP28 devices
  • Adapts QSFP28 interface to SFP28 for mixed-speed networks
  • Supports 100G to 25G speed conversion in one adapter
  • Uses QSFP28 and SFP28 connectors for direct compatibility
  • New Lenovo Mellanox adapter for flexible network deployment

QSFP28 to SFP28 adapter cable

This Lenovo Mellanox QSA adapter converts a 100G QSFP28 port to a single 25G SFP28 connection. It lets you link 25G transceivers or direct-attach cables to higher-density 100G switch ports. The passive design requires no external power and adds minimal latency to the link.

Network teams upgrading to 25G links

Suited for operators who need to break out 100G ports for 25G server uplinks or storage connections. Builders who need native 100G throughput, multi-lane breakout, or active signal conditioning should look elsewhere, as this adapter provides a single-lane 25G path only.

Connector pairing QSFP28 to SFP28

The mechanical interface matches a QSFP28 receptacle on one end and an SFP28 receptacle on the other. This pairing decides whether the adapter fits your switch and transceiver combination; verify both port types before ordering.

Highlights

  • Connect 100G QSFP28 ports to 25G SFP28 devices
  • Adapts QSFP28 interface to SFP28 for mixed-speed networks
  • Supports 100G to 25G speed conversion in one adapter
  • Uses QSFP28 and SFP28 connectors for direct compatibility
  • New Lenovo Mellanox adapter for flexible network deployment

Specifications

BrandLenovo
CatQSFP28/SFP28
Connector AQSFP28 Network
Connector BSFP28 Network

Questions about this item

What QSFP28 port speed must my switch or NIC support for this adapter to function?

The adapter requires a 100G QSFP28 port on the host side to accept the module and pass traffic to the SFP28 side.

Will this adapter work if I plug a legacy 10G SFP+ transceiver into the SFP28 side?

The SFP28 connector is designed for 25G modules; 10G SFP+ transceivers are not supported by this adapter.

After installation, how can I confirm the link is operating at 25G on the SFP28 side?

Check the port status on the connected switch or NIC; it should report a 25G link with the module present.

New to this? Which coin should you pay with — what to check, what it costs to pay, and what is never asked for.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.