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Cisco ONS 15454 SDH Reference Manual, R5.0
April 2008
Chapter11 SDH Topologies and Upgrades
11.5 Subtending Rings
Figure 11-24 shows an example of an SNCP to MS-SPRing integrated DRI handoff.
Figure11-24 ONS 15454 SDH SNCP to MS-SPRing Integrated DRI Handoff
11.5 Subtending Rings
The ONS 15454 SDH supports up to 84 SDH regenerator SDCCs or 28 LDCCs with TCC2/TCC2P
cards. See Table11-1 on page 11-1 for ring and regenerator SDCC and LDCC information.
Subtending rings reduce the number of nodes and cards required and reduce external shelf-to-shelf
cabling. Figure 11-25 shows an ONS 15454 SDH with multiple subtending rings.
Path Selector
Bridge
115741
SNCP
MS-SPRing
Node 4 Node 3
Node 1
Node 5 Node 2
Node 8 Node 6
Node 7