System information

Troubleshooting Dialin Connections 16-347
Interpreting show line Output
Ready — If the modem state is Ready instead of Idle, there are three
possibilities:
• Modem control is not configured on the access server or
router. Configure the access server or router with the modem
inout line configuration command.
• A session exists on the line. Use the show users exec
command and use the clear line privileged exec command to
stop the session if desired.
• DSR is high. There are two possible reasons for this:
— Cabling problems—If your connector uses DB-25 pin 6
and has no pin 8, you must move the pin from 6 to 8 or get
the appropriate connector.
— Modem configured for DCD always high—The modem
should be reconfigured to have DCD high only on CD.
1
This is usually done with the &C1 modem command (refer
to Figure 16-1), but check your modem documentation for
the exact syntax for your modem.
If your software does not support modem control, you
must 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 and
reconfigure the access server line with the exec line
configuration command.
Ready noCTS noDSR DTR RTS There are four possibilities for the noCTS string appearing in the
Modem hardware state field:
• The modem is turned off.
• The modem is not properly connected to the access server.
Check the cabling connections from the modem to the access
server.
• Incorrect cabling (either rolled MDCE, or straight MDTE, but
without the pins moved). See Table 16-2 for information on
the recommended cabling configuration.
• The modem is not configured for hardware flow control.
Disable hardware flow control on the access server with the no
flowcontrol hardware line configuration command and then
enable hardware flow control on the modem via a
reverse Telnet session. (Consult your modem documentation
and see the section “Establishing a Reverse Telnet Session to a
Modem” earlier in this chapter.)
Reenable hardware flow control on the access server with the
flowcontrol hardware line configuration command.
Modem State Modem Hardware State Meaning