User`s guide

56K Professional Message Modem 35
PROBLEM
The computer or software
will not recognize the
modem.
Your modem cannot achieve a
56K Internet connection.
DIAGNOSIS
You may not be entering
modem commands in the
proper manner.
If you are using an external
modem, the COM port may
not be enabled.
In accordance with the
ITU-T standard for 56K
transmissions (V.90), this
modem is capable of 56 Kbps
downloads. However, the
download speeds you
experience may be lower due
to varying line conditions and
other factors. Uploads from
users to server equipment
travel at speeds up to 31.2
Kbps. An analogue phone
line compatible with the V.90
standard or x2™ technology,
and an Internet provider or
corporate host site with the
V.90 standard or x2
technology are necessary for
these high-speed downloads.
POSSIBLE SOLUTION
Type in all upper case (AT) or
all lower case (at).
Refer to your computer’s
manual for information
concerning enabling COM ports
(usually involves altering the
bios settings, motherboard
jumpers, and the operating
system).
Check http://
www.3com.com/56k for a
list of ISPs that observe the
56K ITU standard and/or
offer x2 technology.
Call your phone company to
find out if your phone line is
compatible with the ITU-T
standard for 56K and/ or is
x2-compatible. You can also
run the U.S. Robotics Line
Test utility to determine if
your line is compatible. To
run the test, visit
http:// www.3com.com/56k