Specifications

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Cisco ONS 15454 Installation and Operations Guide, R3.2
March 2002
Chapter 5 SONET Topologies
Bidirectional Line Switched Rings
Figure 5-16 A three-node BLSR before adding a new node
Procedure: Add a BLSR Node
Perform these steps on-site and not from a remote location.
Step 1 Draw a diagram, similar to Figure 5-16, for the BLSR installation where you will add the node. In the
diagram, identify the nodes, cards (slots) and spans (east or west) that will connect to the new node. This
information is essential to complete this procedure without error. For example, in Figure 5-16, you
would circle Slot 5 (west) on Node 1, and Slot 12 (east) on Node 4.
Step 2 Log into CTC and display the BLSR nodes in network view. Verify the following:
• All BLSR spans on the network map are green.
• On the Alarms tab, no critical or major alarms are present, nor any facility alarms, such as LOS,
LOF, AIS-L, SF, and SD. In a BLSR, these facility conditions may be reported as minor alarms.
• On the Conditions tab, no ring switches are active.
If trouble is indicated, for example, a major alarm exists, resolve the problem before proceeding.
Step 3 Install the OC-N cards in the ONS 15454 that you will add to the BLSR; use the “Install the BLSR Trunk
Cards” procedure on page 5-11. Ensure fiber cables are available to connect to the cards. Run test traffic
through the node to ensure the cards are functioning properly.
Step 4 Log into the new node and complete the BLSR setup.
• Provision the SONET DCC using the “Create the BLSR DCC Terminations” procedure on
page 5-13.
• Configure the BLSR timing using the “Set Up ONS 15454 Timing” procedure on page 3-14.
• Enable the BLSR ports using the “Enable the BLSR Ports” procedure on page 5-13.
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West East
West East
West East
West East
Slot 5
Tx
Rx
Slot 12
Tx
Rx
Node 3
Slot 5
Tx
Rx
Slot 12
Tx
Rx
Node 2Node 1
Slot 5
Tx
Rx
Slot 12
Tx
Rx
Node 4
Slot 5
Tx
Rx
Slot 12
Tx
Rx