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11-16
Cisco ONS 15454 SDH Reference Manual, R5.0
April 2008
Chapter 11 SDH Topologies and Upgrades
11.3 Subnetwork Connection Protection
Figure 11-15 shows a common SNCP ring application. STM-1 path circuits provide remote switch
connectivity to a host V5.x switch. In the example, each remote switch requires eight E-1s to return to
the host switch. Figure 11-16 on page 11-17 and Figure 11-17 on page 11-17 show the shelf layout for
each node in the example.
Figure 11-15 STM-1 SNCP Ring
Node A has four E1-14 cards to provide 42 active E-1 ports. The other sites only require two E1-14 cards
to carry the eight E-1s to and from the remote switch. You can use the other half of each ONS 15454 SDH
shelf assembly to provide support for a second or third ring to other existing or planned remote sites.
In this sample STM-1 SNCP ring, Node A contains four E1-14 cards and two STM-1 cards. Six free slots
are available, which you can provision with cards or leave empty.
Note Fill unused card slots with a blank faceplate (Cisco P/N 15454E-BLANK). The blank faceplate ensures
proper airflow when operating the ONS 15454 SDH.
Figure 11-16 shows the shelf setup for this sample configuration.
8 E-1s
8 E-1s
8 E-1s
V5.x
Switch
ONS 15454 SDH
Node A
ONS 15454 SDH
Node B
ONS 15454 SDH
Node C
ONS 15454 SDH
Node D
= Fiber 1
= Fiber 2
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