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7-4
Cisco ONS 15310-MA SDH Reference Manual, Release 9.1 and Release 9.2
78-19417-01
Chapter 7 Circuits and Tunnels
Circuit Properties
7.2.2 Circuit States
The circuit service state is an aggregate of the cross-connect states within the circuit.
• If all cross-connects in a circuit are in the unlocked-enabled service state, the circuit service state is
In-Service (unlocked).
• If all cross-connects in a circuit are in an Out-of-Service (locked) service state, such as
locked-enabled,maintenance; Out-of-Service and Autonomous, Automatic In-Service
(locked-disabled,Automatic In Service); or Out-of-Service and Management, Disabled
(locked-enabled,disabled), the circuit service state is locked.
• PARTIAL is appended to the locked circuit service state when circuit cross-connect states are mixed
and not all states are unlocked-enabled. The locked-PARTIAL state can occur during automatic or
manual transitions between states. locked-PARTIAL can appear during a manual transition caused
by an abnormal event such as a CTC crash or communication error, or if one of the cross-connects
could not be changed. Refer to the Cisco ONS 15310-MA SDH Troubleshooting Guide for
troubleshooting procedures.
You can assign a state to circuit cross-connects at two points:
• During circuit creation, you can set the state on the Create Circuit wizard.
• After circuit creation, you can change a circuit state in the Edit Circuit window or from the
Tools > Circuits > Set Circuit State menu.
Note After you have created an initial circuit in a CTC session, the subsequent circuit states default to the
circuit state of the initial circuit, regardless of which nodes in the network the circuits traverse or the
node.ckt.state default setting.
During circuit creation, you can apply a service state to the drop ports in a circuit. You cannot transition
a drop port from the unlocked-enabled service state to the locked-enabled,disabled service state; you
must first put the port in the locked-enabled,maintenance state before changing it to the
locked-enabled,disabled state. For more information about port service state transitions, see
Appendix B, “Administrative and Service States.”
Circuits do not use the soak timer, but ports do. The soak period is the amount of time that the port
remains in the locked-disabled,Automatic In Service service state after a signal is continuously received.
When the cross-connects in a circuit are in the locked-disabled,Automatic In Service service state, the
ONS 15310-MA SDH monitor the cross-connects for an error-free signal. It changes the state of the
circuit from locked to unlocked or to locked-PARTIAL as each cross-connect assigned to the circuit path
PENDING_MERGE Any new circuits created to represent an alternate path in a topology
upgrade are set to this status to indicate that the circuit is temporary.
These circuits can be deleted if a topology upgrade fails. For more
information about in-service topology upgrades, see Chapter 9, “SDH
Topologies and Upgrades.”
DROP_PENDING A circuit is set to this status when a new circuit drop is being added.
Table 7-1 ONS 15310-MA SDH Circuit Status (continued)
Status Definition/Activity