Filter
Top Products
8-11
Cisco ONS 15600 Reference Manual, R7.2
Chapter 8 SONET Topologies and Upgrades
8.4 Path-Protected Mesh Networks
Figure 8-10 Connecting Fiber to a Four-Node, Four-Fiber BLSR
8.4 Path-Protected Mesh Networks
In addition to single BLSRs, path protection configurations, and ADMs, you can extend ONS 15600
traffic protection by creating path-protected mesh networks (PPMNs). PPMNs include multiple
ONS 15600 SONET topologies and extend the protection provided by a single path protection to the
meshed architecture of several interconnecting rings. In a PPMN, circuits travel diverse paths through a
network of single or multiple meshed rings. When you create circuits, CTC automatically routes circuits
across the PPMN, or you can manually route them. You can also choose levels of circuit protection. For
example, if you choose full protection, CTC creates an alternate route for the circuit in addition to the
main route. The second route follows a unique path through the network between the source and
destination and sets up a second set of cross-connections.
For example, in Figure 8-11, a circuit is created from Node 3 to Node 9. CTC determines that the shortest
route between the two nodes passes through Node 8 and Node 7, shown by the dotted line, and
automatically creates cross-connections at Nodes 3, 8, 7, and 9 to provide the primary circuit path.
131782
Node 1
West East
West East
West East
West East
Slot 2
Port 7
Slot 12
Port 11
Node 4
Node 2
Node 3
Tx
Rx
Slot 3
Port 1
Slot 13
Port 1
Tx
Rx
Tx
Rx
Tx
Rx
Slot 2
Port 7
Slot 2
Port 7
Slot 2
Port 7
Slot 3
Port 1
Slot 3
Port 1
Slot 3
Port 1
Slot 12
Port 11
Slot 12
Port 11
Slot 12
Port 11
Slot 13
Port 1
Slot 13
Port 1
Slot 13
Port 1
Working fibers
Protect fibers