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Chapter 5 - Troubleshooting
MT5634ZLX/FE
P:
The Characters on the Screen Are Doubled
C: Both the modem and the software have the echo feature turned on.
S: Since only one needs an echo, turn the software echo feature off.
C: The remote modem is echoing your typed characters.
S: Type ATE1 then Enter at the command line. Then turn off the software echo feature.
P:
No Text Appears on the Screen in Data Mode
C: The remote modem is not echoing your typed characters.
S: Type ATE0 then click Enter at the command line. Then turn the software echo feature on.
C: Your software may not be set to use Full Duplex or the remote modem may not be set to use
Full Duplex either.
C: The remote modem may be waiting for you to type a command before it will reply with text.
P: No Text Appears on the Screen When in Command Mode
S: If you can’t see the characters you are typing, then type ATE1 then click Enter.
P: The Modem Does Not Dial a Phone Number After Execution of AT Dial Command
C: If you use touch tone dialing on a phone line that requires pulse dialing, then it may not work.
S: Use ATDT in place of ATDP.
P: Communications Software Dials, but Fails
C: Make sure the software dialing prefix is ATDT.
C: Make sure the software and modem are set to the same COMx port.
C: The modem may not have hung up the phone line since the last call.
S: Change to Command mode and type ATH then click Enter.
P: The Modem Connects with Some Modems, but Not with Others
C: The remote modem may not support data compression or error correction, which might
cause it to take too long to negotiate a link.
S: You might try changing the way the modem negotiates by using the AT&Qn, ATNn, and
ATS37=n commands. It might be best to start with AT&Q0N1.
P: When Dialing Another Modem, You Receive a ‘CONNECT’ Response, but Nothing Else
C: The remote modem may be waiting for you to type a command.
S: Try to log on to the remote site (click Enter).
S: Type an AT command, then click Enter.
P: The Modem Speaker Does Not Make Any Sound When Connecting to Another Modem
C: The software may have the speaker disabled.
S: Change the setting in your software or use the ATMn command to turn the speaker on.
P: The Modem Loses the Connection When in Use
C: The remote modem may have locked up.
S: Run the Remote Digital Loopback Test (&T4 command).
C: The telephone switch may have disconnected your call.