Blsr Application Example - Cisco ONS 15454 Reference Manual

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12.2 12.2.4 BLSR Application Example

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

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.

12.2.4 BLSR Application Example

network connects to other carriers at Node 0. Traffic is delivered to the service provider's major hubs.

Cisco ONS 15454 Reference Manual, R7.0.1

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

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)

STS 1-192 (Fiber 2)

192 x N – PT

= Node 3 – Node 1 traffic

= Node 1 – Node 2 traffic

= Node 2 – Node 3 traffic

SONET Topologies and Upgrades