Specifications

Cisco ONS 15327 Product Overview
Network Configurations
36
Cisco ONS 15327 Product Overview, R3.3
June 2002
Figure 27 Two-fiber bidirectional line switched ring
Unidirectional Path Switched Ring
A UPSR is a closed-loop, two-fiber transport architecture that survives cable cuts
and equipment failure because it provides duplicate fiber paths for each service.
Nodes in the ring are connected using a single pair of optical fibers. Working
Node 0
Node 1
Node 2
Node 3 OC-48 Ring
= Fiber 1
= Fiber 2
61938
STSs 1-24 (working)
STSs 25-48 (protect)
STSs 1-24 (working)
STSs 25-48 (protect)