Cisco ONS 15454 SDH Specifications download pdf (Page 242)

5-52

Cisco ONS 15454 SDH Installation and Operations Guide, R3.3

May 2002

Chapter 5 SDH Topologies

Creating Linear ADM Configurations

5.10 Creating Linear ADM Configurations

You can configure ONS 15454 SDHs as a line of add/drop multiplexers (ADMs) by configuring one set

of STM-N cards as the working path and a second set as the protect path. Unlike rings, linear

(point-to-point) ADMs require that the STM-N cards at each node have a 1+1 protection scheme to

ensure that a break to the working line is automatically routed to the protect line.

Figure 5-39 on page 5-52 shows three ONS 15454 SDHs in a linear ADM configuration. Working traffic

flows from Node 1/Slot 6 to Node 2/Slot 6, and from Node 2/Slot 12 to Node 3/Slot 12. You create the

protect path by placing Slot 6 in 1+1 protection with Slot 5 at Nodes 1 and 2, and placing Slot 12 in 1+1

protection with Slot 13 at Nodes 2 and 3.

Figure 5-39 A linear (point-to-point) ADM configuration

Procedure: Create a Linear ADM

Step 1 Complete the general setup information for a node that you want to configure for linear ADM. For

procedures, see the “Setting Up Basic Node Information” section on page 3-2.

Step 2 Set up the network information for the node. For procedures, see the “Setting Up Network Information”

section on page 3-4.

Step 3 Set up 1+1 protection for the STM-N cards in the ADM. In Figure 5-39 on page 5-52, Slots 6 and 12 are

the working ports and Slots 5 and 13 are the protect ports. In this example, you would set up one

protection group for Node 1 (Slots 5 and 6), two for Node 2 (Slots 5 and 6, and 12 and 13) and one for

Node 3 (Slots 12 and 13). To create protection groups, see the “Creating Card Protection Groups” section

on page 3-24.

Step 4 For STM-N ports connecting ONS 15454 SDHs, set the SDH DCC terminations:

a. Start CTC for a linear ADM node and choose the Provisioning > SDH DCC tabs.

b. In the SDCC Terminations section, click Create.

c. Deselect the “Set Port In Service” checkbox.

Note The terminating nodes (Nodes 1 and 3 in Figure 5-39 on page 5-52) will have one SDCC, and

the intermediate nodes (Node 2 in Figure 5-39) will have two SDCCs.

Purpose Use this procedure to create a linear ADM. Complete the following steps

for each node that will be included in the linear ADM.

Prerequisite Procedures None

Onsite/Remote Onsite or remote

Node 1

Node 3

Node 2

Slot 5 to Slot 5

Slot 6 to Slot 6

Slot 12 to Slot 12

Slot 13 to Slot 13

Working Path

Protect Path

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