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Chapter 8. Troubleshooting
61203153L2-20 Express 3000 User Manual 8-5
Auto-detect Switch SPIDs remains at Link
Down.
A
Link Down
condition persisting for longer than five minutes
indicates a problem with the ISDN line provided from the telephone
company. Usually, the ISDN physical layer device has been unable
to synchronize to the network.
1. Verify that the Express 3000 is powered on.
2. Verify that the provided ISDN telephone cable is correctly
installed between the Express 3000 and the ISDN wall jack.
a. If the wall jack does not have ISDN installed on the two
middle pins (tip and ring), the Express 3000 will never syn-
chronize to the telephone switching equipment.
b. Call the local telephone company and have them check the
ISDN line for correct operation.