Information Technology Reference
In-Depth Information
Table16-2 Modem and Modem Hardware States in show line Output (continued)
Modem State
Modem Hardware State
Meaning
Ready
CTS DSR DTR RTS
There are two possibilities for the presence
of the DSR string instead of the noDSR
string in the Modem hardware state field:
Incorrect cabling (either rolled
MDCE, or straight MDTE, but without
the pins moved). See Table 16-1 for
information on the recommended
cabling configuration.
•
The modem is configured for DCD
always high. Reconfigure the modem
so that DCD is high only on CD. This
is usually done with the
&C1
modem
command, but check your modem
documentation for the exact syntax for
your modem.
Configure the access server line to
which the modem is connected with
the
no exec
line configuration
command. Clear the line with the
clear
line
privileged exec command, initiate
a reverse Telnet session with the
modem, and reconfigure the modem so
that DCD is high only on CD.
End the Telnet session by entering
disconnect
. Reconfigure the access
server line with the
exec
line
configuration command.
•
CTS* DSR* DTR RTS
2
Ready
If this string appears in the Modem
Hardware State field, modem control is
probably not enabled on the access server.
Use the
modem inout
line configuration
command to enable modem control on the
line.
See Table 16-1 for more information on
configuring modem control on an access
server or router line.
1.
CD = carrier detect.
2.
An * next to a signal indicates one of two things: The signal has changed within the past few seconds,
or the signal is not being used by the modem control method selected.
Gathering Modem Performance Information
This section explains ways to gather performance data on MICA digital modems found in the Cisco
AS5x00 family of access servers. The data can be used for trend analysis and is useful in troubleshooting
performance problems that might be encountered. When looking at the numbers presented here, bear in
mind that perfection is not possible in the real world. The modem call success rate (CSR) possible will
