Cisco Systems 15454-FTF2 11.9.1 Open-Ended Path Protection Circuits

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Cisco ONS 15454 Reference Manual, R8.5.x
78-18106-01
Chapter 11 Circuits and Tunnels
11.9.1 Open-Ended Path Protection Circuits
Note The XC-VXC-10G cross-connect card supports VT switching based on SF and SD bit error rate (BER)
thresholds. The XC10G and XCVT cross-connect cards do not sup port VT switching based on SF and
SD BER thresholds, and hence, in the path protection Selectors tab, t he SF BER Level and SD BER
Level columns display "N/A" for these cards.
In the Path Protection Switch Counts subtab, you can:
• Perform maintenance switches on the circuit selector.
• View switch counts for the selectors.
Figure 11-7 Editing Path Protection Selectors
11.9.1 Open-Ended Path Protection Circuits
If ONS 15454s are connected to a third-party network, yo u can create an open-ended path protection
circuit to route a circuit through it. To do this, you create four circuits. One circuit is created on the
source ONS 15454 network. This circuit has one source and two destinations, each destination
provisioned to the ONS 15454 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 ONS 15454. 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 destina tion
node chooses between the two signals that arrive at the node, similar to a regular path protection circuit.