Nortel Networks OPTera Metro 3500 - Manual (Page 48)

2-10 Operation, administration, and maintenance (OAM) features
OPTera Metro 3500 Multiservice Platform NTRN10AN Rel 12.1 Standard Iss 1 Apr 2004
Figure 2-2
OPTera Metro 3500 bandwidth management architecture with VTX-series circuit
pack
EX0810t
Figure 2-3
OPTera Metro 3500 bandwidth management architecture with STX-192 circuit
pack
EX1491p
BLSR networks (2-fiber)
OPTera Metro 3500 supports 2-Fiber BLSR networks in its protection scheme
and configuration portfolios.
A 2-Fiber bidirectional line-switched ring (BLSR) is a ring network of nodes
interconnected by a pair of fibers. Like the unidirectional path-switched ring
(UPSR), the BLSR provides 100% restoration of restorable traffic for single
failures by reserving 50% of the ring’s capacity for protection. Consequently,
a 2-Fiber OC-48 or OC-192 ring effectively has a span capacity of STS-24 and
STS-96 respectively.
OPTera Metro 3500
192 STS or 5376 VT
Switching matrix
STS-48 equivalent
bandwidth optical
interface (slot 11) STS-48 equivalent
bandwidth optical
interface (slot 12)
STS-3 or STS-12 equivalent bandwidth
for tributary slots 3 to 10
STS-192 equivalent
bandwidth optical
interface (slot 11) STS-192 equivalent
bandwidth optical
interface (slot 12)
768 STS
Switching Matrix
STS-1, STS-3, STS-12 or STS-48 equivalent
bandwidth for tributary slots 3 to 10
OPTera Metro 3500