Cisco 1600R Installationsanleitung PDF herunterladen (Seite 57)

Troubleshooting A-9

Troubleshooting ISDN

NT1 LED is on.

OK LED (next to ISDN S/T port) is off

(Cisco 1604).

• If there is no device

connected to the ISDN S/T

port, the OK LED should be

off.

• Is the device connected to

the ISDN S/T port turned on

and correctly conﬁgured?

• Possible router hardware

problem.

• Possible problem with

device connected to the

ISDN S/T port.

Cisco 1604 cannot create an ISDN connection to

the remote router when an ISDN device is

connected to the ISDN S/T port.

• Is the ISDN conﬁgured for

multipoint service?

• Is the external ISDN device

using both B channels?

• The service provider should

conﬁgure the line for

multipoint service.

• The service provider should

conﬁgure the line for

multipoint service.

ISDN device attached to the Cisco 1604 ISDN S/T

port does not operate correctly.

• Does the device operate

correctly if the interface for

the Cisco 1604 ISDN U port

(interface bri0) is shut

down?

• Is the Cisco 1604 using both

B channels?

• The service provider should

conﬁgure the line for

multipoint service.

• The service provider should

conﬁgure the line for

multipoint service.

Figure A-1 Troubleshooting ISDN (Continued)

Symptom Checks Causes and Solutions

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