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SNC-BD (Switch Node Clock Circuit Pack)
Issue 1 June 2005 2025
120 FAIL The SNC circuit pack cannot communicate with the SNI in slot 20.
1. If a standby SNC (one with its yellow LED off) was tested and resulted
in this error code, follow normal escalation procedures. Use status
switch-node to show the active and standby SNCs.
2. Use list configuration carrier to determine whether an SNI
is physically present in slot 20. If the Vintage field indicates that a
circuit pack is present, proceed to step 3. If the Vintage field shows
no board:
a. If an SNI is not supposed to be installed in slot 20
1. This failure will not affect service. Use change circuit-pack
to remove the missing SNI from administration.
2. If the error persists, use reset board location to reset the
active SNC circuit pack. If the error still appears, replace the
active SNC circuit pack.
b. If an SNI is supposed to be installed in slot 20, insert one.
3. Enter display errors for category pnc. If the SNC has SNC-BD
error 513, or SNC-LINK errors with Aux Data 1 pointing to other SNIs
besides the one in slot 20, replace the active SNC circuit pack.
4. If SNIs in the same carrier have SNI-BD error 257 logged, (indicating
they are having trouble communicating with the SNC), replace the
active SNC circuit pack.
5. If the SNC being tested has SNC-LINK Error Type 3841, replace the
SNI in slot 20. Replacing an SNI may interrupt service. See SNI-BD
(SNI Circuit Pack) on page 2046 for the procedure for replacing an
SNI.
6. If the SNC being tested still has SNC-LINK Error Type 3841, replace
the SNC circuit pack.
PASS The administered data and the circuit packs the SNC can communicate
with match.
Table 739: TEST #759 Configuration Audit (continued)
Error
Code
Test
Result
Description / Recommendation
18 of 19