Cisco Systems ONS 15600 manual Path-Protected Mesh Networks

Chapter 8 SONET Topologies and Upgrades

8.4 Path-Protected Mesh Networks

Figure 8-10 Connecting Fiber to a Four-Node, Four-Fiber BLSR

Node 1 Node 2

		Tx					Tx
West		Rx	East	West			Rx	East
Slot 2	Slot 3	Slot 12	Slot 13		Slot 2	Slot 3	Slot 12 Slot 13
Port 7 Port 1		Port 11	Port 1		Port 7	Port 1	Port 11	Port 1

		Tx					Tx
West		Rx	East	West			Rx	East
Slot 2	Slot 3	Slot 12	Slot 13		Slot 2	Slot 3	Slot 12 Slot 13
Port 7 Port 1		Port 11	Port 1		Port 7	Port 1	Port 11	Port 1
	Node 4					Node 3

Working fibers Protect fibers

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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.

Cisco ONS 15600 Reference Manual, R7.2

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