Cisco ONS 15454 SDH E1-75 Manual - Page 15

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Chapter 11 Circuits and Tunnels

11.7 SNCP Circuits

Use the Edit Circuits window to change SNCP selectors and switch protection paths. In the SNCP

Selectors subtab on the Edit Circuits window, you can:

•

On the SNCP Selectors tab, the SF Ber Level and SD Ber Level columns display "N/A" for those nodes

Note

that do not support VC low-order signal BER monitoring. In Software Release 6.0, only the

Cisco ONS 15310-CL supports VC low-order signal BER monitoring.

On the SNCP Switch Counts subtab, you can:

•

11.7.1 Open-Ended SNCP Circuits

If ONS 15454 SDH nodes are connected to a third-party network, you can create an open-ended SNCP

circuit to route a circuit through it. To do this, you create three circuits. One circuit is created on the

source ONS 15454 SDH network. This circuit has one source and two destinations, one at each

ONS 15454 SDH that is connected to the third-party network. The second circuit is created on the

third-party network so that the circuit travels across the network on two paths to the ONS 15454 SDH

nodes. That circuit routes the two circuit signals across the network to ONS 15454 SDH nodes that are

connected to the network on other side. At the destination node network, the third circuit is created with

two sources, one at each node 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 SNCP circuit.

11.7.2 Go-and-Return SNCP Routing

The go-and-return SNCP routing option allows you to route the SNCP working path on one fiber pair

and the protect path on a separate fiber pair

path. If a fault occurs, neither the working fibers nor the protection fibers are affected. This feature only

applies to bidirectional SNCP circuits. The go-and-return option appears on the Circuit Attributes panel

of the Circuit Creation wizard.

78-18119-01

View the SNCP circuit's working and protection paths.

Edit the reversion time.

Set the hold-off timer.

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

Perform maintenance switches on the circuit selector.

View switch counts for the selectors.

(Figure

11-5). The working path will always be the shortest

Cisco ONS 15454 SDH Reference Manual, R8.5

11.7 SNCP Circuits

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