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Chapter 5 – Troubleshooting
MT5634ZLX, MT5634ZLXI, MT5634ZLX/FE User Guide 28
When Dialing Another Modem, a CONNECT Response Is Received, But Nothing
Else
• Cause: The remote modem may be waiting for you to type a command.
• Solution: Try to log on to the remote site (press Enter).
Solution: Type an AT command, then press Enter.
The Modem Speaker Does Not Make Any Sound When Connecting to Another
Modem
• Cause: The software may have the speaker disabled.
Solution: Change the setting in your software or use the ATMn command to turn the speaker on.
Occasionally, the Modem Gives a Burst of Errors
• Cause: The telephone line may be noisy or bad.
Solution: Hang up the call and try to connect again to get a better telephone line.
• Cause: If there are other telephones on the same line your modem is using, someone may have
picked up a telephone on that extension.
• Cause: Your telephone line may have the Call Waiting feature.
Solution: Try adding *70 to your ATDT dialing command line. If it doesn’t help, ask your
telephone company how to temporarily disable call waiting.
Transmitted Data Random Errors
Solution: Try to use V.42 or MNP2-4 if possible.
Solution: Connect the modems at a slower baud rate.
After Downloading a File, the File Does Not Store on the Disk Drive
• Cause: If both modems are using MNP or V.42 protocol, then flow control may not be enabled.
Solution: Configure your software to use RTS/CTS flow control to cause your computer to pause
long enough for the file to be stored to disk.
The Text on the Screen Is Not Legible
• Cause: Your software settings may not match the settings of the remote device.
Solution: Make sure your data bits, stop bits, and parity settings match the settings that the other
computer is using. The two most common settings are: 8 data bits, None parity, and 1 stop bit
(8,N,1) or 7 data bits, Even parity, and 1 stop bit (7,E,1).
• Cause: If the telephone line is very noisy, you may see corrupted data on your screen.
• Cause: Due to poor telephone line conditions, the modem may have fallen back to a slower
communication speed. You may need to change the baud rate setting in your software to match
this slower speed. To return the modem to the higher speed, disconnect the link and re-establish
again.