Chapter 5 Sonet Topologies; Before You Begin; Bidirectional Line Switched Rings; Table 5-1 Ons 15327 Rings - Cisco ONS 15327 User Documentation

SONET Topologies
This chapter explains how to set up the Cisco ONS 15327 in different SONET topologies, including:
•
•
•
•
•

5.1 Before You Begin

To avoid errors during network configuration, Cisco recommends that you draw the complete ONS
15327 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
2-Fiber BLSR 2
UPSR

5.2 Bidirectional Line Switched Rings

The ONS 15327 can support two concurrent BLSRs in one of the following configurations:
•
•
Each BLSR can have up to 32 ONS 15327s. Because the working and protect bandwidths must be equal,
you can create only OC-12 or OC-48 BLSRs.
June 2002
Two-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 15327 node.
ONS 15327 Rings
Maximum per node
5
5
Two, two-fiber BLSRs, or
One two-fiber BLSR.
C H A P T E R
Cisco ONS 15327 User Documentation, R3.3
5
5-1