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Troubleshooting Modems
This section describes how to perform diagnostic testing on installed modems, test two modems
back-to-back, disable modems from service, reset a modem, and debug a modem.
Perform a Modem Startup Test
To perform diagnostic testing on all the installed modems during the system's initial startup or
rebooting process, enter the following command in global configuration mode [the prompt is
displayed as
•
The results of the modem startup test are displayed in the Status column of the show modem
command's output. Modems that pass the diagnostic test are marked as Idle, Busy, Downloading, and
Reset. Modems that fail the diagnostic test are marked as Bad*. These modems cannot be used for
call connections. Depending on how many modems are installed, this diagnostic test may take from
5 to 15 minutes to complete. Perform additional testing on an inoperative modem by executing the
test modem back-to-back command. The no modem startup-test command disables startup
testing.
Test Two Modems Back-to-Back
Perform additional testing on a modem suspected of being inoperable by conducting a series of
internal back-to-back connections and data transfers between two modems. All modem test
connections occur inside the access server. For example, if mobile users cannot dial into modem 2/5
(which is the sixth modem port on the modem board in the second chassis slot), attempt a
back-to-back test with modem 2/5 and a known-functioning modem such as modem 2/6.
Enter the following command in enable mode (the prompt is displayed as
back-to-back modem tests between two modems:
•
You might need to enable this command on several different combinations of modems to determine
which one is not functioning properly. A pair of operable modems successfully connect and
complete transmitting data in both directions. An operable modem and an inoperable modem do not
successfully connect with each other.
]:
5300(config)#
modem startup-test—Perform diagnostic testing for all modems.
test modem back-to-back first-slot/modem-number second-slot/modem-number—Perform
internal back-to-back modem tests between two modems.
Troubleshooting Modems
) to perform internal
5300#
Managing Modems A-7
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