Maintenance-Object Repair Procedures
555-233-143
8-1436 Issue 1 May 2002
Switch Node Interface Manual Loop Back
Procedure
This procedure is destructive.
This procedure is to be used when an SNI circuit pack cannot be tested by
software. This can occur when communication between the switch node carrier
and the server is down. Before using this procedure, the configuration audit test
(#759) should be run on SNI circuit packs where possible via test board UUCSS
s. Also, the processor route audit test (#760) should be run via the test board
UUCSS long command for the active SNC in the switch node carrier. If the active
SNC is not inserted, test 760 can be run via test hardware-group pnc P, where P
is a-pnc or b-pnc.
Before using this procedure, first determine whether more than one SNI is unable
to communicate with software. Verify SNI and SNC circuit pack insertion via the
list configuration carrier UUC command, where UUC is the cabinet and carrier
location of a switch node carrier. Check for inserted SNIs and SNCs in every
administered switch node carrier.
If every SNI and SNC is not inserted, then "NO BOARD" is displayed for each
board in the entire PNC (either the a-pnc or the b-pnc). As a result, the link
between the IPSI-connected EPN’s EI (on the PNC where SNI and SNC circuit
packs were not inserted) and the connected SNI does not function properly. If this
case applies, perform the following steps:
1. Run the test board UUCSS command on the IPSI-connected EPN’s EI,
and fix any problems found.
2. Perform the manual loopback procedure for the IPSI-connected EPN’s EI.
3. Perform the manual loopback procedure for the SNI connected to the
IPSI-connected EPN’s EI.
4. Replace the active SNC.
If the system has a 2-level switch node carrier configuration (i.e., SNI-to-SNI fiber
links exist) and the SNIs and SNCs in the second switch node carrier only (the
switch node carrier that has no SNI connected to the IPSI-connected EPN’s EI)
are not inserted and at least two SNI-to-SNI fiber links exist, perform the following
steps:
1. Run the test board UUCSS long command on the SNIs in the first switch
node carrier that are connected to SNIs in the second switch node carrier
and fix any problems found.
2. Replace the active SNC.
3. Perform the manual loopback procedure for the SNIs in the second switch
node carrier that are connected to SNIs in the first switch node carrier.
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