Nortel CTA 500dm Installation Manual page 73

Data call problem?
P0873832 Issue 05
AT commands do not appear.
¥ To see the commands that you type in a HyperTerminal window,
you must Disconnect, then Connect again.
Using HyperTerminal, the message "Unable to open COMx
port" appears.
¥ The CTA 500dm may be in use by another application (for
instance, Dial-Up Networking).
Data calls are not answered automatically.
¥ Make sure that rings until answer S0 is not set to 0. See
registersÓ on page 41
¥ If the rings until answer value is too high, the calling device may
time out.
Data calls are answered but are terminated too soon.
¥ Make sure that you are calling the correct device.
¥ Make sure that the remote device is set to the same rate
adaptation protocol as the CTA 500dm. See
protocol speciÞcationsÓ on page 80
¥ Make sure that the proper authentication protocols are used at
both ends and that your ID and password are correct.
¥ If the data rate is set to 64 kbit/s, the network may not be able to
support 64 kbit/s. Try connecting at 56 kbit/s. See
Call Control commands summaryÓ on page 47
data rate.
The CTA 500 dm rejects calls.
¥ Make sure the CTA 500dm is conÞgured to accept calls and that
the call type (bearer capability) and call rate are set correctly. See
ÒIncoming Call Control commands summaryÓ on page 49
more information.
¥ ÒAllow caller accessÓ may not be enabled in
Server conÞguration.
The CTA 500 dm aborts calls when dialing.
¥ This may be the any key abort feature of the dial command. See
ÒDial CommandÓ on page 44
¥ The CTA 500dm may not be seizing a line. Check that the
correct line pool code or external dial digit is used in Dialing
for more information.
for more information.
for more information.
CTA 500 dm On Line Guide
Troubleshooting 73
ÒS-
ÒRate adaptation
ÒOutgoing
to change your
for
Installing Dial-Up