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SONET Topologies
This chapter explains how to set up the Cisco ONS 15454 in different SONET topologies, including:
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5.1 Before You Begin
To avoid errors during network configuration, Cisco recommends that you draw the complete ONS
15454 SONET 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.
Table 5-1
Table 5-1
Ring Type
All rings
BLSRs
2-Fiber BLSR 2
4-Fiber BLSR 1
UPSR
5.2 Bidirectional Line Switched Rings
The ONS 15454 can support two concurrent BLSRs in one of the following configurations:
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Each BLSR can have up to 16 ONS 15454s. Because the working and protect bandwidths must be equal,
you can create only OC-12 (two-fiber only), OC-48, or OC-192 BLSRs.
November 2001
Two-fiber and four-fiber bidirectional line switched rings (BLSRs)
Unidirectional path switched rings (UPSRs)
Subtending rings
Linear add/drop multiplexers (ADMs)
Path-protected mesh networks (PPMNs)
shows the SONET rings that can be created on each ONS 15454 node.
ONS 15454 Rings
Maximum per node
5
2
4
Two, two-fiber BLSRs, or
One two-fiber and one four-fiber BLSR.
C H A P T E R
Cisco ONS 15454 Installation and Operations Guide
5
5-1
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