Specifications

Cisco ONS 15454 Product Overview
Network Configuration
40
Cisco ONS 15454 Product Overview, R3.3
May 2002
fiber. Working traffic travels in one direction on STSs 1–24 on one fiber, and on
STSs 1–24 in the opposite direction on the second fiber. You can create OC-12,
OC-48, and OC-192 two-fiber BLSRs.
Figure 23 Four-fiber bidirectional line switched ring
Four-fiber BLSRs double the bandwidth of two-fiber BLSRs by dedicating a
second optical card for protection rather than reserving half of the active card for
protection. If one fiber is cut, the ring does not switch because the other fiber
carries the traffic for the broken span. A ring switch occurs if both the working
and protect fibers fail. You can create OC-48 and OC-192 four-fiber BLSR.
Node 0
Node 1
Node 2
Node 3
Span 1
Span 2Span 3
Span 4
Span 8
Span 7Span 6
Span 5
OC-48 Ring
= Working fibers
= Protect fibers
61932