3Com 56k User's Manual And Reference page 31

Troubleshooting
PROBLEM
Your 56K modem cannot achieve a 56K Internet connection.
POSSIBLE SOLUTION
Your modem is capable of receiving data at speeds up to 56 Kbps and sending data at speeds up to 31.2 Kbps.
However, the download speeds you experience may be lower due to varying line conditions. An analogue phone
line compatible with ITU-T V.90 or 3Com 56K technology, and an Internet provider or corporate host site
compatible with ITU-T V.90 or 3Com 56K technology are necessary for these high-speed downloads. Check
http://www.3com.com/56k for a list of ISPs that observe ITU-T V.90 and/or offer 3Com 56K technology.
POSSIBLE SOLUTION
Your phone line may not be capable of transferring data at the full 56K, but V.90 and 3Com 56K technology
operate at a range of speeds and will use the highest speed possible.
POSSIBLE SOLUTION
You may have devices between the modem and the wall socket. There should be no line splitters, fax machines,
or other devices between the modem and the wall socket.
27