Multi-Tech Systems MT4X56USB - Manual (Page 60)

MultiModemUSB User Guide
MT4X56USB 60
• If you have extension phones on the same line as your modem, you or someone else can
interrupt the connection by picking up another phone. If this is a frequent problem, disconnect
the extension phones before using the modem, or install another phone line especially for the
modem.
• Check for loose connections between the modem and the computer and the telephone jack.
• You might have had a poor connection because of line conditions or the problem might have
originated on the other end of the line. Try again.
• If you were online with a service such as MultiTech’s Web site, it might have hung up on you
because of lack of activity on your part or because you exceeded your time limit for the day.
Try again.
The Modem Cannot Connect When Answering
• Autoanswer might be disabled. Turn on autoanswer in your data communications program or
send the command ATS0=1 (ATS0=2 if you have Caller ID service) to make sure your
MODEM is in terminal mode.
The Modem Doesn’t Work with Caller ID
• Caller ID information is transmitted between the first and second rings, so if autoanswer is
turned off (S0=0) or if the modem is set to answer after only one ring (S0=1), the modem will
not receive Caller ID information. Check your initialization string, and if necessary change it
to set the modem to answer after the second ring (S0=2).
• Make sure that you have Caller ID service from your telephone company.
Fax and Data Software Can’t Run at the Same Time
Communications devices can be accessed by only one application at a time. In Windows 98, you can
have data and fax communication applications open at the same time, but they cannot use the same
modem at the same time.
Loopback Tests
Each time you turn on your modem, it performs an automatic self-test to ensure proper operation.
Your modem also has three diagnostic tests: local analog loopback, remote digital loopback, and
local digital loopback. These ITU-T V.54 loopback tests isolate telephone circuit and transmission
problems.
In a loopback test, data from your computer loops through the circuits of your modem and/or a
remote modem before it appears on your monitor. When the loop has been completed, the data on
your PC’s monitor should match the original data.
The local analog loopback test allows you to verify that the modem’s transmitter and receiver circuits
are functioning properly.
The local digital loopback allows you to verify that the local computer or terminal, the two modems,
and the transmission line between them are functioning properly.
The remote digital loopback test allows you to verify that the remote computer or terminal, the remote
modem, the serial ports, the telephone line, and the local modem are functioning properly.
Note: All loopback tests operate at all speeds except 300 bps.