5-5
Cisco ONS 15327 User Documentation, R3.3
June 2002
Chapter 5 SONET Topologies
Bidirectional Line Switched Rings
Figure 5-4
BLSR bandwidth reuse
5.2.3 Sample BLSR Application
shows a sample two-fiber BLSR implementation. A regional long-distance network connects
to other carriers at Node 0. Traffic is delivered to the service provider’s major hubs.
•
Carrier 1 delivers two DS-3s over one OC-3 span to Node 0. Carrier 2 provides two 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.
•
The ONS 15327 OC-3 card supports a total of four OC-3 ports so that two additional OC-3 spans
can be added at little cost.
STS#1
STS#1
STS#1
STS#1
Node 0
Node 1
Node 2
Node 3
32131
= Node 3 – Node 1 traffic
= Node 1 – Node 2 traffic
= Node 2 – Node 3 traffic
Summary of Contents for ONS 15327
Page 22: ...Contents xxii Cisco ONS 15327 User Documentation June 2002 I N D E X ...
Page 30: ...Figures xxviii Cisco ONS 15327 User Documentation June 2002 ...
Page 44: ...Procedures xlii Cisco ONS 15454 Installation and Operations Guide R3 2 June 2002 ...
Page 540: ...Glossary GL 16 Cisco ONS 15327 User Documentation R3 3 June 2002 ...