Cisco Systems 15454-FTF2 11.9 Path ProtectionCircuits

11-19
Cisco ONS 15454 Reference Manual, R8.5.x
78-18106-01
Chapter 11 Circuits and Tunnels
11.8.1 Monitor Circuits using portless ports as a source on DS3XM-12
Figure 11-6 VT1.5 Monitor Circuit Received at an EC1-12 Port
11.8.1 Monitor Circuits using portless ports as a source on DS3XM-12
With STS bi-directional circuit between source and destination and with VT-MAPPED at "circuit
source" as an option using DS3XM-12 in 15454 SONET platforms, two circuits will get created:
1) src->even portless port
2) odd portless port->dest
Traffic flow from source to dest is as follows:
src->even port->odd port->dest
While creating Monitor circuit using Even portless port as source, the circuit will get created in the
direction towards:
dest-> odd portless port-> Even portless port -> dest Monitored port
While creating Monitor circuit using odd portless port as source, the circuit will get created in the
direction towards:
src-> Even portless port-> odd portless port -> dest Monitored port
Note Monitor circuits cannot be used with Ethernet circuits.
11.9 Path ProtectionCircuits
Use the Edit Circuits window to change path protection selectors and switch protection paths
(Figure 11-7). In the Path Protection Selectors subtab in the Edit Circuits window, you can:
• View the path protection circuit’s working and protection paths.
• Edit the reversion time.
• Set the hold-off timer.
• Edit the Signal Fail/Signal Degrade thresholds.
• Change payload defect indication path (PDI-P) settings.
EC1-12 OC-N
XC
ONS 15454
Node 1
OC-N DS1-14
XC
ONS 15454
Node 2
VT1.5 Drop
VT1.5 Monitor
Test Set
Port 1
Port 2
Class 5
Switch
45157