Avaya 03-300430 User Manual

2500

ABRT

Internal system error

1. Retry the command at 1-minute intervals up to 3 times.

FAIL

Far-End Internal loop back failed. A problem exists between DS1 converter 
A and DS1 converter B’s internal interface for the DS1 facility (see previous 
diagram).

1. If the test is executed as a part of an error analysis, then return back to 

the related section.

2. Enter display errors and follow the associated repair procedures 

for any on-board DS1C-BD errors on this DS1 converter circuit pack 
and the DS1 converter circuit pack at the other end of the DS1 
converter complex.

3. If the network is used instead of private T1 lines, verify that the DS1 

facility and the network are using the same Line Coding. For TN574 
boards and TN1654 boards in T1 mode, also verify that the Framing 
Mode used is the same. Use list fiber-link and display 
fiber-link to check the values for this DS1 facility. Contact T1 

Network Service to check the modes used by the network. See the 
previous sections, “Line Coding” and “Framing Mode” for details on 
how these options apply to the TN574 and TN1654 DS1 converter 
boards.

4. Isolate the problem by running the Near-End External Loopback test 

(#799) via test ds1-facility location external-loopback, 

first at this end and then at the other end of the DS1 converter complex. 
Setup loop backs at different points as shown in the description 
diagram for Test #799, and follow repair procedures described for Test 
#799.

5. If the problem could not be found by near-end external loop-back tests, 

then the fault should be between the CSU A and the CSU B. Contact 
T1 Network Service to resolve the problem, also see the repair 
procedures for Error Type #1025 (loss of frame alignment).

Any

PASS

Transmission through the path of the loop back is successful. TN1654 DS1 

facilities will display the round trip delay time in milliseconds in the Error 

Code field. The round trip delay time is defined as the length of time in 

milliseconds it takes for the firmware to receive the test pattern after it has 

been sent.

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