Sdh Topologies And Upgrades; Overview; Point-To-Point And Linear Adm Configurations - Cisco ONS 15600 Reference Manual

SDH Topologies and Upgrades

This chapter explains Cisco ONS 15600 SDH topologies and upgrades. To provision topologies, refer to
the Cisco ONS 15600 SDH Procedure Guide.
Chapter topics include:
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8.1 Overview

The ONS 15600 SDH usually operates as a hub node in networks that include ONS 15454 SDHs. Single
nodes are installed at geographic locations where several ONS SDH topologies converge. A single
ONS 15600 SDH node might be a part of several ONS SDH rings/networks.
To avoid errors during network configuration, Cisco recommends that you draw the complete ONS SDH
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.

8.2 Point-to-Point and Linear ADM Configurations

You can configure ONS 15600 SDHs as a line of add/drop multiplexers (ADMs) by configuring one
STM-N port as the working path and a second port as the protect path. Unlike rings, point-to-point (two
node configurations) and linear (three node configurations) ADMs require that the STM-N ports at each
node be in 1+1 protection to ensure that a break to the working line automatically routes traffic to the
protect line.
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8.1 Overview, page 8-1
8.2 Point-to-Point and Linear ADM Configurations, page 8-1
8.3 Multiplex-Section Shared Protection Rings, page 8-2
8.4 Subnetwork Connection Protection Rings, page 8-7
8.5 Dual-Ring Interconnect, page 8-9
8.6 Subtending Rings, page 8-17
8.7 Extended Subnetwork Connection Protection Networks, page 8-19
8.8 In-Service Topology Upgrades, page 8-21
8.9 Overlay Ring Circuits, page 8-23
C H A P T E R
Cisco ONS 15600 SDH Reference Manual, Release 9.0
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