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Chapter 12
SONET Topologies and Upgrades
12.6 Subtending Rings
12.6 Subtending Rings
The ONS 15454 supports up to 84 SONET SDCCs or 28 SONET LDCCs with TCC2/TCC2P cards. See
Table 12-1 on page 12-2
for ring, SDCC, and LDCC information.
Subtending rings reduce the number of nodes and cards required, and reduce external shelf-to-shelf
cabling.
Figure 12-27
shows an ONS 15454 with multiple subtending rings.
Figure 12-27
ONS 15454 with Multiple Subtending Rings
Path
Protected
Nodes
BLSR
BLSR
Figure 12-28
shows a path protection configuration subtending from a BLSR. In this example, Node 3
is the only node serving both the BLSR and the path protection configuration. OC-N cards in Slots 5 and
12 serve the BLSR, and OC-N cards in Slots 6 and 13 serve the path protection configuration.
Cisco ONS 15454 Reference Manual, R8.5
12-29
78-18106-01
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