Online Troubleshooting; The Modem Does Not Respond To Dial Commands From Your Software; The Modem Can Connect To Some Modems, But Not To Others - Zoom PCMCIA V.90 User Manual

Solution: Make sure that you are dialing a valid phone
number, including any required dial prefixes.
If you are using touch-tone dialing on a line
that requires pulse dialing, the line may not be
able to accept touch-tone-dialed calls. Change
the software dialing prefix to ATDP to specify
pulse dialing.
Problem: The modem does not respond to Dial com-
mands from your software.
Solution: Make sure the software dialing prefix is ATDT,
if tone dialing is provided by the telephone
service.
Make sure your communications software,
card management software, and modem are
configured for the same COM port.

Online troubleshooting

Problem: The modem can connect to some modems,
but not to others.
Solution: If a remote modem does not respond because
of the extended negotiation process, you may
have to disable part or all of the negotiation
process. In the following table, "protocol"
means error correction and data compression.
Note that the first two lines in the table are
likely to be the most valuable.
To force the different communica-
tion speeds...
Negotiate speed and protocol
(default setting)
Connect at 56000 bps (V.90)
Connect at 56000 bps (K56flex)
Connect at 33600 bps (V.34)
Connect at 14400 bps (V.32bis)
Connect at 9600 bps (V.32)
22
Type these com-
mands and press En-
ter
AT &F
AT S109=2
AT S109=1
AT S37=19
AT S37=11
AT S37=9
User's Guide