Chapter 7 Circuits and Tunnels

Subnetwork Connection Protection Circuits

Edit the reversion time.

Set the hold-off timer (HOT) for linear multiplex section protection selector switching.

Edit the Signal Fail (SF)/Signal Degrade (SD) bit error rate (BER) thresholds.

Change path payload defect indication (PDI-P) settings.

Note On the Subnetwork Connection Protection Selectors tab, the SF Ber Level and SD Ber Level columns

display “N/A” for those nodes that do not support VC low-order path signal BER monitoring.

In the Subnetwork Connection Protection Switch Counts subtab, you can:

Perform maintenance switches on the circuit selector.

View switch counts for the selectors.

7.6.1Open-Ended Subnetwork Connection Protection Circuits

If ONS 15310-MA SDH nodes are connected to a third-party network, you can create an open-ended Subnetwork Connection Protection circuit to route a circuit through the network. To do this, you create four circuits. One circuit is created on the source network. This circuit has one source and two destinations, with each destination provisioned to the interface that is connected to the third-party network. The second and third circuits are created on the third-party network so that the circuit travels across the network on two diverse paths to the far-end node. At the destination node, the fourth circuit is created with two sources, one at each node interface connected to the third-party network. A selector at the destination node chooses between the two signals that arrive at the node, similar to a regular Subnetwork Connection Protection circuit.

7.6.2 Go-and-Return Subnetwork Connection Protection Routing

The go-and-return Subnetwork Connection Protection routing option allows you to route the Subnetwork Connection Protection working path on one fiber pair and the protect path on a separate fiber pair (Figure 7-2). The working path will always be the shortest path. If a fault occurs, neither the working or protection fibers are affected. This feature only applies to bidirectional Subnetwork Connection Protection circuits. The go-and-return option appears on the Circuit Attributes page of the Circuit Creation wizard.

Cisco ONS 15310-MA SDH Reference Manual, Release 9.1 and Release 9.2

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Cisco Systems 15310-MA manual Open-Ended Subnetwork Connection Protection Circuits

15310-MA specifications

Cisco Systems has established itself as a leader in the networking domain, offering a wide array of solutions to meet the needs of modern businesses. Among its impressive product lineup are the Cisco 15310-CL and 15310-MA routers, designed to provide advanced network performance and reliability.

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