Configuring 40G/100G Multi-rate Transceivers for network switches

Configuring 40G/100G Multi-rate Transceivers for network switches

Multi-rate transceivers are ideal for future proofing your networks. Recently, our tech support resolved a couple of incompatibility issues that customers encountered when using multi-rate transceivers in network switches. An earlier post talked about it from the switching perspective - changing the port parameters on the switch to recognize the correct data rate on the transceiver. In this post, we look at the steps involved in making changes to transceivers.


Our customer currently utilizes Cisco 9236c switch for video distribution with 40G QSFP+ to 4x10G breakout configuration. They are upgrading their system and have chosen to buy 100G/40G select rate units to bridge the gap as they proceed through the upgrade process.



They currently need the select rate transceivers to operate at 40G but the switch was recognizing them as 100G. To accomplish this, you need to access the modules' serial data through the switch CLI, Command Line Interface, and make minor edits to the serial data.


  • Login to the switch with executive privileges
  • Via CLI use
    show idprom module slot detail
    command to access modules' serial data
  • Make the necessary changes to Lower Page A0H bytes 87, 88, and 98 to 0x00 for 40G functionality.





Contact us if you have any questions about using select rate transceivers. You can find product information here.