Cisco ONS 15454 SDH Specifications Page 239

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Cisco ONS 15454 SDH Installation and Operations Guide, R3.3
May 2002
Chapter 5 SDH Topologies
Subtending Rings
After subtending two MS-SPRings, you can route circuits from nodes in one ring to nodes in the second
ring. For example in Figure 5-37 on page 5-48, you can route a circuit from Node 1 to Node 7. The
circuit would normally travel from Node 1 to Node 4 to Node 7. If fiber breaks occur, for example
between Nodes 1 and 4 and Nodes 4 and 7, traffic is rerouted around each ring: in our example, Nodes
2 and 3 in Ring 1 and Nodes 5 and 6 in Ring 2.
Procedure: Subtend an SNCP Ring from an MS-SPRing
Step 1 In the node that will subtend the SNCP (Node 3 in Figure 5-36 on page 5-48), install the STM-N cards
that will serve as the SNCP trunk cards (Node 3, Slots 6 and 13).
Step 2 Attach fibers from these cards to the SNCP trunk cards on the SNCP nodes. In Figure 5-36 on page 5-48,
Node 3/Slot 6 connects to Node 5/Slot 13, and Slot 13 connects to Node 6/Slot 6.
Step 3 From the node view, click the Provisioning > SDH DCC tabs.
Step 4 Click Create.
Step 5 In the Create SDCC Terminations dialog box, click the slot and port that will carry the SNCP ring.
Step 6 Set the ports in service by making sure the Set Port In Service checkbox is checked.
Step 7 Click OK.
The selected slots/ports are displayed in the SDCC Terminations section.
Step 8 Follow Steps 1 7 for the other nodes you will use for the SNCP ring.
Step 9 Display the network view to view the subtending ring.
Purpose Use this procedure to subtend an SNCP ring from an MS-SPRing. A
subtended ring reduces the number of nodes and cards required and
reduces external shelf-to-shelf cabling.
Prerequisite Procedures This procedure requires an established MS-SPRing and one node with
STM-N cards and fibers to carry the SNCP ring. The procedure also
assumes you can set up an SNCP ring. (For SNCP ring setup procedures,
see the Creating SNCP Rings section on page 5-3.)
Onsite/Remote Onsite
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