Multitech MT9234ZPX-UPCI User's Guide download pdf (Page 22)

Appendix A - Troubleshooting

22 MultiModem ZPX UPCI/PCIe User Guide

Data Is Lost

● If you are using data compression and a high speed serial port, set the serial port baud rate to two to six times

the data rate.

● Make sure the flow control method you selected in software matches the method selected in the modem (see

AT commands &K and \Q.)

● Try entering the I11 command in online mode or the &V command in command mode to display information

about the last connection, making a screen print of the connection statistics, and checking for parameters that

might be unacceptable. To display information about the present configuration, you must use the escape

sequence, +++, to ensure command mode while still on line. To return to on line mode, set ATO.

Garbage Characters on the Monitor

● Your computer and the remote computer might be set to different word lengths, stop bits, or parities. If you

have connected at 8-N-1, try changing to 7-E-1, or vice-versa, using your communication software.

● You might be experiencing line noise. Enable error correction, if it is disabled, or hang up and call again; you

might get a better connection the second time.

● At speeds above 2400 bps, the remote modem might not use the same transmission or error correction

standards as your modem. Try connecting at a slower speed or disabling error correction. (With no error

correction, however, line noise can cause garbage characters.)

● Try entering the I11 command in online mode or the &V command in command mode to display information

about the last connection, making a screen print of the connection statistics, and checking for parameters that

might be unacceptable. To display information about the present configuration, you must use the escape

sequence, +++, to ensure command mode while still on line. To return to on line mode, set ATO.

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 phone company.

Fax and Data Software Can’t Run at the Same Time

● Communication devices can be accessed by only one application at a time. In Windows 2000 and higher, you

can have data and fax communication applications open at the same time, but they cannot use the same

modem at the same time.

Voice Functions Don’t Work

To verify the voice circuits:

1. Verify that all connecting telephone, microphone, and speaker cables are undamaged and firmly connected

to the correct jacks.

2. Retry whatever action was not working.

3. If the problem persists, try the voice mail test; if that doesn’t work, and if you have a microphone and speaker

connected to the MultiModem, try the loopback and speakerphone tests, which do not require special

software.

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Multitech MT9234ZPX-UPCI User's Guide Page 22