COURIER HIGH SPEED MODEMS
E-4 Troubleshooting
6. Make sure your modem's connection rate setting, &Nn is
correct for the call. If the connection rate is locked at a
speed (&N1−&N14) different from the calling modem's, the
Courier hangs up. The factory setting of &N0, variable link
operations, allows the two modems to negotiate the highest
possible connection rate.
7. If none of the above corrects the problem, it's likely that the
quality of the phone connection is poor and that the other
modem is missing the signals your modem is transmitting.
The variable quality of phone line connections may be due
to any number of conditions in the phone service's
equipment or the current environment. Try several calls,
and if you still can't get through, try calling another modem.
If the second modem accepts your call, the problem may lie
with the modem you first tried to call.
During Data Transfer
Your screen displays . . .
Only brackets
Check to make sure that both modems are set to the same bit
rate, word length, parity and number of Stop bits. If the settings
are correct, the problem may be with the phone line. Try the
following measures:
1. Try placing the call again. The phone company routes even
local calls differently each time you call.
2. Try calling a different modem to see if the problem persists.
The problem may be with the modem you first tried to call.
Random or garbage characters
Check to make sure that both modems are set to the same bit
rate, word length, parity, and number of Stop bits.
If the modem is set to a fixed serial port rate (&B1) and your
software is fixed at 19.2K, 38.4K, 57.6K, or 115.2K bps, the
reason may be one of the following:
1. Your computer may not support the high rate. If this is the
case, fix your software rate at 9600 bps and disable high-
speed V.32 terbo modulation: ATS34=3 or ATS34 .0=1 .1=1.
