Nortel Networks OPTera Metro 3500 - Manual (Page 216)

2-178 Operation, administration, and maintenance (OAM) features
OPTera Metro 3500 Multiservice Platform NTRN10AN Rel 12.1 Standard Iss 1 Apr 2004
Figure 2-65
Virtual ring (path-in-line) and shared VT-managed STS
EX1549p
OM3500
OM3500
OM3500
OM3500
OM3500
(W/STX) OM3500
(W/STX)
OM3500
(W/STX) OM3500
(W/STX)
A
C
B D
Working
time slots
Working
time slots
OC-3/12/48
UPSR ring
OC-3/12/48
UPSR ring
= OM3500 tributary circuit pack
= Path bridge & select
= Traffic A - B, VT#1, STS-1 #1 on a virtual ring (path-in-line), working
= Traffic A - B, VT#1, STS-1 #1 on a virtual ring (path-in-line), protected
= Traffic C - D, VT#2, STS-1 #1 on a virtual ring (path-in-line), working
= Traffic C - D, VT#2, STS-1 #1 on a virtual ring (path-in-line), protected
Note: For simplicity, only one direction is shown.
UPSR, 2 way
(unprotected)
UPSR, 2 way
(unprotected)
VT#1,
STS-1 #1
VT#2,
STS-1 #1
Backbone
Network
Legend