Cisco ONS 15454 SDH Specifications download pdf (Page 246)

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

May 2002

Chapter 5 SDH Topologies

Creating Linear ADM Configurations

Step 1 Start CTC for one of the nodes that you want to convert from linear to ring.

Step 2 Click the Maintenance > Protection tabs.

Step 3 Under Protection Groups, choose the 1+1 protection group (that is, the group supporting the 1+1 span

cards).

Step 4 Under Selected Group, verify that the working slot/port is shown as “Working/Active.” If it is, proceed

to Step 5. If the working slot says “Working/Standby” and the protect slot says “Protect/Active,” switch

traffic to the working slot:

a. Under Selected Group, choose the Protect/Active slot.

a. From the Switch Commands pull-down menu, choose Manual.

b. Click Yes on the confirmation dialog box.

c. Verify that the working slot is carrying traffic. If it is, continue to Step d. If not, clear the conditions

that prevent the card from carrying working traffic before proceeding to Step d.

d. From the Switch Commands, choose Clear. A Confirm Clear Operation dialog is displayed.

e. Click Yes on the confirmation dialog box.

Step 5 Repeat Step 4 for each group in the 1+1 Protection Groups list at all nodes that will be converted.

Step 6 For each node, delete the 1+1 STM-N protection group that supports the linear ADM span:

a. Click the Provisioning > Protection tabs.

b. From the Protection Groups list, choose the group you want to delete. Click Delete.

c. Click Yes on the confirmation dialog box.

d. Verify that no traffic disruptions are indicated on the SDH test set. If disruptions occur, do not

proceed. Add the protection group and begin troubleshooting procedures to find out the cause of the

disruption.

Note Deleting a 1+1 protection group may cause unequipped path (UNEQ-P) alarms to occur.

Step 7 Physically remove one of the protect fibers running between the middle and end nodes. In the

Figure 5-41 on page 5-57 example, the fiber running from Node 2/Slot 13 to Node 3/Slot 13 is removed.

The corresponding end-node trunk card will display an LOS alarm.

Purpose The following procedures describe how to convert a three-node linear

ADM to an MS-SPRing.

Tools SDH test set

Prerequisite Procedures This procedure assumes you have an existing linear ADM that you want to

convert to an MS-SPRing.

Onsite/Remote Onsite

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Cisco ONS 15454 SDH Specifications Page 246