Specifications

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