Bought a 3Com Home Connect modem (Model 3CR29220) 6/2001.
Came with a 5 year warranty (even though 3Com has ended its cable modem manufacturing).
It is a DOCSIS compatible modem.
Has worked great on ATT Broadband in Hopkinton.
As Far As I Know (AFAIK), all DOCSIS compatible modems are supposed to work with ATT Broadband (back when they were with RoadRunner (rr)):
Thank you for writing to AT&T Road Runner.
Rest assured that any cable modem that is DOCSIS compliant will work
with the RoadRunner service. Also, any modem that has been tested and
approved by Cable Labs is definitely a good bet.
Sincerely,
Ian T-w
AT&T Road Runner Online Customer Support Center
I'd recommend taking the time and making the effort to get it in writing that the Office Connect version is 100% right on (very, very likely to be?)