During modem to modem communication, your modem will try to make a V.90 connection. If that is not possible, the modem will try to connect using the V.34 protocol. Check with your service provider to see if they support the V.90 protocol before upgrading. 1 Designed to be capable of receiving at up to 56kbps with x2 or V.90 compatible phone line and server equipment, and transmitting at up to 31.2 kbps. Public networks currently limit download speeds to about 53kbps.
Actual speeds vary and are often less than the maximum.