Nortel Networks OPTera Metro 3500 - Manual (Page 64)

2-26 Operation, administration, and maintenance (OAM) features
OPTera Metro 3500 Multiservice Platform NTRN10AN Rel 12.1 Standard Iss 1 Apr 2004
If Node D fails, path c is squelched at Node A and path d is squelched at Node
C. Path b is not squelched, as the path is rerouted from Node A to Node B by
the protection switch. Path a is unaffected by the protection switch, as it does
not route through the failed node.
Table 2-3
Node D squelch map (example)
Connection SAP node ID End node ID
b A B
c D A
d C D