Cisco CX-FEIP-2TX= Installation and con?guration Especificações descarregar pdf (Página 187)

100

101

5-9

Cisco ONS 15454 Installation and Operations Guide, R3.2

March 2002

Chapter 5 SONET Topologies

Bidirectional Line Switched Rings

5.2.5 Sample BLSR Application

Figure 5-9 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 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.

• The ONS 15454 OC-3 card supports a total of four OC-3 ports so that two additional OC-3 spans

can be added at little cost.

Figure 5-9 A five-node BLSR

Figure 5-10 shows the shelf assembly layout for Node 0, which has one free slot. Figure 5-11 shows the

shelf assembly layout for the remaining sites in the ring. In this BLSR configuration, an additional eight

DS-3s at Node IDs 1 and 3 can be activated. An additional four DS-3s can be added at Node ID 4, and

ten DS-3s can be added at Node ID 2. Each site has free slots for future traffic needs.

Node 0

56 local

DS-1s 4 DS-1s 14 DS-1s

14 DS-1s

8 DS-3s

4 DS-1s

2 DS-1s

Carrier 1

2 OC-3s

Node 1

Node 2

Node 3

Node 4

= Fiber 1

= Fiber 2

32138

Carrier 2

12 DS-3s

1 2 ... 182 183 184 185 186 187 188 189 190 191 192 ... 492 493

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