Maintenance-Object Repair Procedures
555-233-143
8-670 Issue 1 May 2002
e. More than 88 negative and/or positive slip errors occurred. This error will
clear 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 fibers and
display fiber-link commands to check the values for this DS1
facility. Contact T1 Network Service to check the modes used by
the network. See the above sections, “Line Coding” and “Framing
Mode” for details on how these options apply to the TN574 and
TN1654 DS1 CONV boards.
3. For TN574 boards and TN1654 boards in T1 mode, check line
equalization settings as described in the above section, “DS1
CONV-1 and DS1 CONV-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 CONV circuit pack.
6. If the problem still persists, replace the DS1 CONV circuit pack at
the other end of the DS1 CONV complex.
f. 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 Figure 8-25 on page 8-675 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 CONV complex are using the same bit rate. Use
list fibers and display fiber-link commands to check the values for
this DS1 facility. Contact T1 Network Service to verify the modes
set for the network. See the above sections, ‘‘Line Coding’’,
‘‘Framing Mode’’, and ‘‘Bit Rate’’ for details on how these options
apply to the TN574 and TN1654 DS1 CONV boards.
2. Run the Near-End External Loopback test (#799) via the test
ds1-facility UUCSSf external-loopback command by setting up a
loop back at CPE side of CSU towards DS1 CONV 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 CONV circuit pack.
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