Avaya 03-300430 User Manual

f. Error Type 856: More than 88 negative and/or positive slip errors occurred. This error 

clears when there are no slips for 1 hour.

1. Enter display errors and follow the associated repair procedures for any SYNC, 

TDM-CLK, and SNC-BD errors.

2. 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.

3. For TN574 boards and TN1654 boards in T1 mode, check line equalization settings as 

described in the previous section, “DS1 converter-1 and DS1 converter-2 Line 
Compensation.”

4. Enter display errors and follow the associated repair procedures for any EXP-INTF, 

and SNI-BD errors for the Fiber Endpoints. Enter display errors and follow the 

associated repair procedures for any FIBER-LK errors for this fiber link.

5. If the problem still persists, replace this DS1 converter circuit pack.

6. If the problem still persists, replace the DS1 converter circuit pack at the other end of the 

DS1 converter complex.

g. Error Type 1025: Loss of Frame Alignment (LFA) Alarm, the RED alarm. This alarm 

indicates that the DS1 interface associated with the DS1 facility cannot frame up on the 
received data.

For the following repair procedure, see to 

page 1068 and the diagrams in the related test descriptions.

1. If the network is used instead of private T1 lines, check 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. For TN1654 boards, verify 
that the two boards in the DS1 converter complex are using the same bit rate. Use list 
fiber-link and display fiber-link to check the values for this DS1 facility. 

Contact T1 Network Service to verify the modes set for the network. See the previous 
sections, 

on page 1059, and 

page 1058 for details on how these options apply to the TN574 and TN1654 DS1 
converter boards.

2. Run the Near-End External Loopback test (#799) via test ds1-facility location 

external-loopback by setting up a loop back at CPE side of CSU towards DS1 

converter circuit pack shown as loop back point LB 1 in the test description diagram. If 
the test fails, replace connectors and the cables between CSU and the DS1 converter 
circuit pack.

3. If the test passes, run the Near-End External Loopback test (#799) via test 

ds1-facility location external-loopback by setting up a loop back at DS1 

facility side of CSU towards the DS1 converter circuit pack shown as loop-back point LB 
2 in the test description diagram. If the test fails, replace the CSU.