Information Technology Reference
In-Depth Information
Table17-4
Dialup Session Ends Up in Existing Session (continued)
Possible Causes
Suggested Actions
Modem control is
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.
Note: Be certain to use the modem inout command instead of 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.
continues
Cabling is
incorrect
1. Check the cabling between the modem and the access server
or router. Confirm that the modem is connected to the
auxiliary port on the access server or router with a rolled
RJ-45 cable and an MMOD DB-25 adapter. This cabling
configuration is recommended and supported by Cisco for
RJ-45 ports. (These connectors are typically labeled
“Modem.”)
Two types of RJ-45 cabling are commonly encountered when
connecting a modem: straight and rolled. If you hold the two ends
of an RJ-45 cable side by side, you'll see eight colored strips, or
pins, at each end. If the order of the colored pins is the same at
each end, then the cable is straight. If the order of the colors is
reversed at each end, then the cable is rolled.
The rolled cable (CAB-500RJ) is standard with Cisco's
2500/CS500.
2.
Use the show line exec command to verify that the cabling is
correct.
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