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Cisco ONS 15600 Reference Manual, R7.2
Chapter 8 SONET Topologies and Upgrades
8.5.1 Point-to-Point or Linear ADM to Two-Fiber BLSR
Note
A database restore on all nodes in a topology returns converted circuits to their original topology.
Note
Open-ended path protection and DRI configurations do not support in-service topology upgrades.
8.5.1 Point-to-Point or Linear ADM to Two-Fiber BLSR
A 1+1 point-to-point or linear ADM to two-fiber BLSR conversion is manual. You must remove the
protect fibers from all nodes in the linear ADM and route them from the end node to the protect port on
the other end node. In addition, you must delete the circuit paths that are located in the bandwidth that
will become the protection portion of the two-fiber BLSR (for example, circuits in STS 25 or higher on
an OC-48 BLSR) and recreate them in the appropriate bandwidth. Finally, you must provision the nodes
as BLSR nodes.
8.5.2 Two-Fiber BLSR to Four-Fiber BLSR
CTC provides a wizard to convert two-fiber OC-48 or OC-192 BLSRs to four-fiber BLSRs. To convert
the BLSR, you must install two OC-48 or OC-192 ports at each two-fiber BLSR node, then log into CTC
and convert each node from two-fiber to four-fiber. The fibers that were divided into working and protect
bandwidths for the two-fiber BLSR are now fully allocated for working BLSR traffic.
8.5.3 Add or Remove a Node from a Topology
You can add or remove a node from a linear ADM, BLSR, or path protection configuration. Adding or
removing nodes from BLSRs is potentially service affecting, however adding and removing nodes from
an existing 1+1 linear ADM or path protection configuration does not disrupt traffic. CTC provides a
wizard for adding a node to a point-to-point or 1+1 linear ADM. This wizard is used when adding a node
between two other nodes.