Specifications

Planning and Engineering Guide, Release TR5.0.x/TN6.0.x 23
Chapter 4
Protected Network Topologies
Introduction
This chapter includes the following topics:
• Point-to-Point or Linear Chain
• Ring
• Mesh
• Interconnected Ring Topologies
• Interconnected Gateway Topologies
• Supported Protected Topologies (Summary)
• Node and Tunnel Diversity for Low Order Tunneled Services
Point-to-Point
or Linear Chain
A simple point-to-point topology connects two nodes with two fibers. Traffic enters the
network at the source node (Node 1), passes through the intermediate nodes (Node 2),
to the destination node (Node 3). In a linear chain topology, the source and destination
nodes are connected through intermediate nodes; that is, they are connected only to one
other node in the network. Intermediate nodes are connected in both the upstream and
downstream directions.
Figure 5 Simple Point-to-Point or Linear Chain Topology
The Traverse supports the following protection schemes for point-to-point topologies:
• 1+1 APS (automatic protection switching)
• 1+1 MSP (multiplex section protection)
• 1+1 MSP <–> 1+1 APS (gateway)
• 1+1 Optimized (SDH network only)
• 1+1 path protection over 1+1 APS, 1+1 MSP, or 1+1 Optimized. There can be any
combination of protection groups up to four links.
Node 1 Node 2 Node 3