Cisco Support Community

IEEE 802.3y

We are wired with Cat3 cabling and I want to get 100Mb/ I found this standard and want to know if the Catalyst switches (4000 and 6000) support IEEE 802.3y (100base-T2)? The encoding for this is PAM 5x5. I called 3Com and asked them if thier NIC's support this and they have told me they do. What I would like to know is how I can get this to work with the Catalyst switches.

Thank you,

Mike Burley


Re: IEEE 802.3y

Since there has been no response to your post, it appears to be either too complex or too rare an issue for other forum members to assist you, or there is no public information available at this time. If you don't get a suitable response to your post, you may wish to review our resources online at You may also contact our product information line at 1-800-553-NETS or a Cisco Systems Engineer at your local Cisco office or reseller. To locate your local Cisco representative, visit

If anyone else in the forum has some advice, please reply to this thread.

Thank you for posting.

CreatePlease to create content