User Guide

2-20 Troubleshooting
Table 2-15 Continued
Problem Possible Cause Solution
Modem does not dial
correctly.
Telephone number is not
entered correctly in the
modem’s dialing software.
■ Make sure the telephone
number you dialed is correct if
you are using the dialing
director
y
or the terminal mode.
■ Dial 1 if using dialing long
distance.
■ The other line could be busy or
not answering.
■ Make sure call waiting is
disabled.
■ The modem may not recognize
an international dial tone. Try
the ATX3DT command and the
telephone number.
Characters are
garbled/transfer rates are
slow.
There is noise in the
telephone line.
■ Check your telephone and
modem cable connections. If
they are a little loose, they
can cause noise on the line.
■ Check with your local
telephone company for a
phone line filter.
Phone line noise causing a
disconnection.
Hang-up Delay S Register
(S10) set too low.
Change S10 default to 150.
To set S10=150:
1. Select Start  Programs 
Accessories  HyperTerminal,
then go to Command Mode.
2. Type ATS10=150 and press
Enter.
This command causes the modem
to take longer to disconnect
even if there is noise on the line.
No dial tone Phone service is not
connected to the telephone
wall jack.
Verify that service from the local
phone company by following
these steps:
1. Unplug the telephone cable
from the telephone wall jack.
2. Connect a telephone to the
jack, pick up the handset, and
listen for a dial tone. If there is
a dial tone, reconnect the
modem to the telephone wall
jack with the telephone cable
and make sure all connections
are secure.
3. If there is still no dial tone,
contact your local phone
company or building manager.
The modem is not responding
to commands from the
computer keyboard.
Verify the modem and computer
are connected:
1. Select Start  Programs 
Accessories  HyperTerminal,
then go to Terminal Mode.
2. Type AT and press the Enter
key. If the modem displays
OK, the modem and computer
are working together. If the
modem displays ERROR, or
does not respond, restart the
computer and repeat step 1.
3. Type ATDT and listen for dial