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Cisco 1750 Router Hardware Installation Guide
78-6169-02
Problem Solving
ISDN S/T
or
ISDN U
Card cannot
make a
connection to
the remote
router.
Use show isdn status
command to check the
following:
• Does the current
ISDN switch type
match actual switch
type being used?
• Use the isdn switch-type
command to configure correct
switch type.
• Is Layer 1 status
deactivated?
• 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.
• If Layer 1 status is
active, does Layer 3
status say “2 Active
Layer 3 calls”?
• Router might have called itself.
Check destination phone number
configured with the dialer map
command or the dialer string
command.
• If Layer 1 status is
active, does Layer 3
status say “No Active
Layer 3 call(s)”?
• 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.
• If Layer 1 status is
active, does Layer 3
status say “1 Active
Layer 3 call”?
• Check router protocol
configurations.
Table 4 Troubleshooting ISDN (continued)
WIC Symptom Check the Following Possible Solution(s)