Fan Behavior - Cisco 1751V Hardware Installation Manual

Problem Solving
Table 3-4 Troubleshooting ISDN (continued)
WIC Symptom
ISDN S/T Card cannot
or make a
ISDN U connection to
the remote
router.

Fan Behavior

Cisco 1751 Router Hardware Installation Guide
3-14
Check the Following
Use show isdn status
command to check the
following:
Does the current ISDN
switch type match actual
switch type being used?
Is Layer 1 status
deactivated?
If Layer 1 status is active,
does Layer 3 status say "2
Active Layer 3 calls"?
If Layer 1 status is active,
does Layer 3 status say
"No Active Layer 3
call(s)"?
If Layer 1 status is active,
does Layer 3 status say "1
Active Layer 3 call"?
Under normal operation, the fan on the Cisco 1751 router is off. The fan turns on
automatically, as required, to cool the system.
Chapter 3
Possible Solution(s)
Use the isdn switch-type command
to configure correct switch type.
Use the show controller bri0
command to check for the messages
CO RUNNING LOOPBACK TESTS
or CO TESTING. If you receive these
messages, contact the service
provider.
Router might have called itself.
Check destination phone number
configured with the dialer map
command or the dialer string
command.
Check destination phone number and
make sure it matches the remote
router phone number. Check route to
the destination and make sure it
matches the remote router network
address.
Check router protocol
configurations.
Troubleshooting
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