Cisco 1600R Installationsanleitung PDF herunterladen (Seite 58)

Cisco 1600 Series Router Hardware Installation Guide

Troubleshooting ISDN

A-10

Cannot make an ISDN connection to remote

device (Cisco 1603, Cisco 1604, ISDN WAN

interface cards).

• Use show 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.

• Check the following:

— 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”?

• 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 and the dialer

string command.

• Check destination phone

number. Check route to the

destination.

• Check router protocol

conﬁgurations.

Figure A-1 Troubleshooting ISDN (Continued)

Symptom Checks Causes and Solutions

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