Data Is Being Lost; There Are Garbage Characters On The Monitor; The Modem Doesn't Work With Caller Id - Multitech MultiModem MT5600ZDX User Manual

Data Is Being Lost

There Are Garbage Characters on the Monitor

The Modem Doesn't Work with Caller ID

If you are using data compression and a high speed serial port, set the serial port
baud rate to four times the data rate.
Your UART might not be reliable at serial port speeds over 9600 bps or 19,200
bps. Turn off data compression, reset your serial port speed to a lower rate, or
replace your serial port with a faster one.
Make sure the flow control method you selected in software matches the method
selected in the modem. If you are using the modem with a Macintosh, you might
have the wrong cable for hardware flow control.
If you are running under Windows 3.1 and have a 16550AFN UART, you might
need to turn on the 16550's data buffers and/or replace the Windows serial
driver, COMM.DRV.
Try entering the &V1 command to display information about the last connection,
making a screen print of the connection statistics, and checking for parameters
that might be unacceptable.
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 communications program.
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 &V1 command to display information about the last connection,
making a screen print of the connection statistics, and checking for parameters
that might be unacceptable.
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.
5 Troubleshooting
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