Blsr Application Example; Figure; Blsr Bandwidth Reuse; Four-Fiber Blsr Capacity - Cisco 15454-DS1-14= - 1.544Mbps Expansion Module Reference Manual

12.2.4 BLSR Application Example

Table 12-3
OC Rate
OC-48
OC-192
1. N equals the number of ONS 15454 nodes configured as BLSR nodes.
2. PT equals the number of STS-1 circuits passed through ONS 15454 nodes in the ring (capacity can vary

Figure 12-7

sets simultaneously on different spans around the ring: one set from Node 3 to Node 1, another set from
Node 1 to Node 2, and another set from Node 2 to Node 3.
Figure 12-7
Node 3
12.2.4 BLSR Application Example
Figure 12-8
network connects to other carriers at Node 0. Traffic is delivered to the service provider's major hubs.
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•
Cisco ONS 15454 Reference Manual, R8.5
12-10

Four-Fiber BLSR Capacity

Working Bandwidth
STS 1-48 (Fiber 1)
STS 1-192 (Fiber 1)
depending on the traffic pattern).
shows an example of BLSR bandwidth reuse. The same STS carries three different traffic

BLSR Bandwidth Reuse

STS#1
STS#1
Node 2
shows a two-fiber BLSR implementation example with five nodes. A regional long-distance
Carrier 1 delivers six DS-3s over two OC-3 spans to Node 0. Carrier 2 provides twelve DS-3s
directly. Node 0 receives the signals and delivers them around the ring to the appropriate node.
The ring also brings 14 DS-1s back from each remote site to Node 0. Intermediate nodes serve these
shorter regional connections.
Protection Bandwidth Ring Capacity
STS 1-48 (Fiber 2) 48 x N
STS 1-192 (Fiber 2) 192 x N – PT
Node 0
STS#1
Node 1
STS#1
= Node 3 – Node 1 traffic
= Node 1 – Node 2 traffic
= Node 2 – Node 3 traffic
Chapter 12 SONET Topologies and Upgrades
1 2
– PT
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