Nortel Networks OPTera Metro 3500 - Manual (Page 80)

2-42 Operation, administration, and maintenance (OAM) features
OPTera Metro 3500 Multiservice Platform NTRN10AN Rel 12.1 Standard Iss 1 Apr 2004
Figure 2-21
Virtual RPR over BLSR and subtending UPSRs: no OPE circuit packs in core BLSR (example)
UPSR #2
BLSR
UPSR #1
Legend
= OPE circuit pack
= Resilient packet ring
X
W
X
W
W X
Network
Element F
Network
Element B
Network
Element E
Network
Element C
Network
Element G
Network
Element A
11
11
12
12
X
12
W
X
W
11
W X
Network
Element D
= BLSR protected line slots
= UPSR protected line slots