The alliance has released NBASE-T PHY interface specifications, and has adopted a first version of a single-port USXGMII MAC-PHY specification.

  • The MAC-PHY specification facilitates system development by enabling simple multivendor interconnection of MAC and PHY components.

The alliance is exploring the industry need for additional specifications to further enable the market.

For more information, please contact the NBASE-T Alliance at


USXGMII Overview and Access Instructions:

  1. Go to 
  2. First time: Select ‘Login’ (top left corner) then create Cisco ID
  3. Login
  4. Select “Browse” tab on the top left -> Technologies -> Networking
  5. On the lower right, select USGMII-USXGMII
  6. Following the instructions to accept conditions and download/view the specs