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CHAPTER
8-1
Cisco ONS 15600 Reference Manual, R7.2
8
SONET Topologies and Upgrades
Note
The terms "Unidirectional Path Switched Ring" and "UPSR" may appear in Cisco literature. These terms
do not refer to using Cisco ONS 15xxx products in a unidirectional path switched ring configuration.
Rather, these terms, as well as "Path Protected Mesh Network" and "PPMN," refer generally to Cisco's
path protection feature, which may be used in any topological network configuration. Cisco does not
recommend using its path protection feature in any particular topological network configuration.
This chapter explains Cisco ONS 15600 SONET topologies and upgrades. To provision topologies, refer
to the Cisco ONS 15600 Procedure Guide.
Chapter topics include:
•
8.1 Overview, page 8-1
•
8.2 Point-to-Point and Linear ADM Configurations, page 8-2
•
8.3 Bidirectional Line Switched Rings, page 8-2
•
8.4 Path-Protected Mesh Networks, page 8-11
•
8.5 In-Service Topology Upgrades, page 8-13
8.1 Overview
The ONS 15600 usually operates as a hub node in networks that include ONS 15454s, ONS 15327s, and
ONS 15310-CLs. Single nodes are installed at geographic locations where several ONS SONET
topologies converge. A single ONS 15600 node might be a part of several ONS SONET rings/networks.
To avoid errors during network configuration, Cisco recommends that you draw the complete
ONS SONET network topology on paper (or electronically) before you begin the physical
implementation. A sketch ensures that you have adequate slots, cards, and fibers to complete the
topology.