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Cisco ONS 15454 Reference Manual, R8.5.x
78-18106-01
Chapter 12 SONET Topologies and Upgrades
12.12.2 Point-to-Point or Linear ADM to Two-Fiber BLSR
Figure 12-35 Unprotected Point-to-Point ADM to Path Protection Conversion
12.12.2 Point-to-Point or Linear ADM to Two-Fiber BLSR
A 1+1 point-to-point or linear ADM to a 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.
To complete a conversion from an unprotected point-to-point or linear ADM to a two-fiber BLSR, use
the CTC Convert Unprotected/Path Protection to BLSR wizard from the Tools > Topology Upgrade
menu.
12.12.3 Path Protection to Two-Fiber BLSR
CTC provides a topology conversion wizard to convert a path protection to a two-fiber BLSR. An
upgrade from a path protection to a two-fiber BLSR changes path protection to line protection. A path
protection can have a maximum of 16 nodes before conversion. Circuits paths must occupy the same time
slots around the ring. Only the primary path through the path protection is needed; the topology
conversion wizard removes the alternate path protection path during the conversion. Because circuit
paths can begin and end outside of the topology, the conversion might create line-protected segments
within path protection paths of circuits outside the scope of the ring. The physical arrangement of the
ring nodes and spans remains the same after the conversion.
OC-48
OC-12
37
ONS 15454
Node 1
ONS 15454
Node 4
ONS 15454
Node 8