I got this modem in a box that said it was a GVC modem with Rockwell certificate.
But inside it was USRobotics made for/by 3Com. Or vice versa.
Very confusing. Anyway, product number is: 3CP2526-GTY-B.
Analog device 1808 JS. USRobotics model 0613.
If it helped just wish me luck in life.