Information Technology Reference
In-Depth Information
Table 16-1 outlines the problems that might cause a modem to router connectivity problem symptom and
describes solutions to those problems.
Table16-1 Dialing: No Connectivity Between Modem and Router
Possible Causes
Suggested Actions
Modem control
not enabled on
the access server
or router
1.
Use the
show line
exec command on the access server or
router. The output for the auxiliary port should show
inout
or
RIisCD
in the Modem column. This indicates that modem
control is enabled on the line of the access server or router.
2.
Configure the line for modem control using the
modem inout
line configuration command. Modem control is now enabled
on the access server.
Example:
The following example illustrates how to configure a line for both
incoming and outgoing calls:
line 5
modem inout
Note:
Be certain to use the
modem inout
command and not the
modem ri-is-cd
command while the connectivity of the modem is
in question. The latter command allows the line to accept
incoming calls only. Outgoing calls will be refused, making it
impossible to establish a Telnet session with the modem to
configure it. If you want to enable the
modem ri-is-cd
command,
do so only after you are certain that the modem is functioning
correctly.
Modem that
could be
misconfigured or
have a hung
session
1.
Enter
AT&FE1Q0
to return the modem to factory defaults,
and make sure that the modem is set to echo characters and
return output. The modem may have a hung session. Use
^U
to clear the line and
^Q
to open up the flow control (XON).
Verify parity settings.
