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5-37
Cisco ONS 15454 Installation and Operations Guide
November 2001
Chapter 5 SONET Topologies
Subtending Rings
Figure 5-28 An ONS 15454 with multiple subtending rings
Figure 5-29 shows a UPSR subtending from a BLSR. In this example, Node 3 is the only node serving
both the BLSR and UPSR. OC-N cards in Slots 5 and 12 serve the BLSR, and OC-N cards in Slots 6 and
13 serve the UPSR.
Figure 5-29 A UPSR subtending from a BLSR
UPSR
UPSR
or BLSR
UPSR
UPSR
UPSR
or
BLSR
55302
Node 3
Node 1
Node 2
BLSR
UPSR
Node 4
55303
Slot 13
East
Slot 12
East
Slot 12
East
Slot 12
East
Slot 13
East
Slot 6
West
Slot 5
West
Slot 5
West
Slot 5
West
Slot 6
West