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24 Chapter 4 Protected Network Topologies

Ring

In a ring configuration, each node is connected to two adjacent nodes. Each node uses

two trunk cards (east and west). In a Traverse network, the port on the east card always

transmits the working signal clockwise around the ring. The port on the west card

always receives the working signal. In ring configurations, each east port is physically

connected to the west port of the next node.

Figure 6 Ring Topology

The Traverse supports the following protection schemes for ring topologies:

• UPSR (unidirectional path switched ring)

• 2 fiber BLSR (bidirectional line switched ring)

• SNCP (subnetwork control protocol) ring

• 2 fiber MS-SPRing (multiplex section shared protection ring)

Node 3Node 1

Node 4

Node 2

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