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61200051L1-1D ISU 2x64 Dual Port ISDN Service Unit User Manual 77
Chapter 10
Troubleshooting
When the ISU 2x64 powers up, it performs an internal self test that
takes approximately 10 seconds. At the end of the test, the front
panel momentarily displays Self Test Passed.
If Self Test
Fails
If Self Test Passed is not displayed, the following steps will verify
whether or not the problem can be fixed locally:
1. Ensure the ISU 2x64 is receiving power.
2. Turn off the ISU 2x64 while holding down 0, then power back
on.
3. Continue to press down 0 for 15 seconds. This resets all the
internal settings to factory defaults.
4. If the ISU 2x64 still does not pass self test, call ADTRAN
Technical Support for assistance; see the back of this manual
for phone numbers.
If The ISU 2x64 Does Not Read Ready
When the ISU 2x64 has been set up and connected to a line, but the
front panel does not read Ready after a few minutes, use the fol-
lowing troubleshooting procedure: