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8.3.3 BLSR Bandwidth
Figure 8-7
Node 3
8.3.3 BLSR Bandwidth
BLSR nodes can terminate traffic coming from either side of the ring. Therefore, BLSRs are suited for
distributed node-to-node traffic applications such as interoffice networks and access networks.
BLSRs allow bandwidth to be reused around the ring and can carry more traffic than a network with
traffic flowing through one central hub. BLSRs can also carry more traffic than a path protection
operating at the same OC-N rate.
BLSRs. The capacity is the OC-N rate divided by two, multiplied by the number of nodes in the ring
minus the number of pass-through STS-1 circuits.
Table 8-1
OC Rate
OC-48
OC-192
1. N equals the number of ONS 15600 nodes configured as BLSR nodes.
2. PT equals the number of STS-1 circuits passed through ONS 15600 nodes in the ring (capacity can vary
Table 8-2
Cisco ONS 15600 Reference Manual, R7.0
8-8
Four-Fiber BLSR Ring Switch
Span 4
Span 5
Span 6
Span 3
Two-Fiber BLSR Capacity
Working Bandwidth
STS 1-24
STS 1-96
depending on the traffic pattern).
shows the bidirectional bandwidth capacities of four-fiber BLSRs.
Node 0
Span 8
OC-48 Ring
Span 7
Node 2
Table 8-1
shows the bidirectional bandwidth capacities of two-fiber
Protection Bandwidth
STS 25-48
STS 97-192
Chapter 8
SONET Topologies and Upgrades
Span 1
Node 1
Span 2
= Working fibers
= Protect fibers
Ring Capacity
1
2
24 x N
– PT
96 x N – PT
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