ISUP Circuit

Each ISUP Circuit object is a child of an ISUP Circuit Group object.

The object contains configuration parameters and status information for an ISUP circuit. An ISUP circuit is an individual timeslot on a DS1. A single circuit carries voice or data traffic for both directions of a telephone call. ISUP Circuits are automatically activated when the parent ISUP Circuit Group is activated so no initial configuration or activation of these objects is required.

Each circuit is uniquely identified by the local exchange, the DS1 (with which the parent circuit group is associated) and the timeslot. Alternatively a circuit can be uniquely identified by the local and remote destinations and the Circuit Identification Code (CIC). A CIC is a unique code for a circuit to a particular remote exchange. It is derived from the base circuit number of the parent circuit group and the number of the timeslot, by multiplying the base circuit number of the circuit group by 24 (for T1 channelization) or 32 (for E1 channelization) and adding the timeslot number. A CIC has a value in the range 1-16383 (for T1 channelization) or 1-4095 (for E1 channelization).


Parameter

Access

Description
Timeslot Read only Timeslot for the circuit.
DS0 status Read only Status of the DS0 Termination to which the circuit binds. Values:
  • Active
    The DS0 Termination is active.
  • Inactive
    The DS0 Termination exists but is inactive.
  • Transient
    The DS0 Termination is in a transient state.
  • Quiescing
    The DS0 Termination is preparing for normal deactivation. It is operating normally but will not accept any new users.
  • Unequipped
    The DS0 Termination is not equipped.
  • Unknown
    The state of the DS0 Termination is unknown.
Local block status Read only Current local blocking status of the circuit. Values:
  • Not blocked
    The circuit is not blocked.
  • Hardware blocked
    The circuit is hardware blocked.
  • Maintenance blocked
    The circuit is maintenance blocked.
Remote block status Read only Current remote blocking status of the circuit. Values:
  • Not blocked
    The circuit is not blocked.
  • Hardware blocked
    The circuit is hardware blocked.
  • Maintenance blocked
    The circuit is maintenance blocked.
  • Unequipped
    The circuit is remotely unequipped.
Allocation status Read only Current allocation status of the circuit. Values:
  • Allocated
  • Free
  • User part unavailable
Last circuit group test result Read only This field does not appear if the parent ISUP Local Signaling Destination's ISUP variant is set to UK. It does not apply in the UK.
Alarm state Read only Specifies whether any alarms are currently raised for this object. Values:
  • Clear
    No alarms are currently raised.
  • Attention Required
    Attention Required - the object is not operating normally, and needs operator intervention.
  • Attend To Dependent
    Attention Required elsewhere - another object on which this object depends is not operating normally.
Alarm log correlator - Attention Required Read only Identifier of the log message for the event that caused the last Attention Required alarm state for this object. This field is reset when the Attention Required alarm events field is reset to zero.
Attention Required alarm events Read only / Reset Number of times (since the alarm count was reset) that this object's alarm state has gone to Attention Required.
Alarm log correlator - Attend To Dependent Read only Identifier of the log message for the event that caused the last Attend To Dependent alarm state for this object. This field is reset when the Attend To Dependent alarm events field is reset to zero.
Attend To Dependent alarm events Read only / Reset Number of times (since the alarm count was reset) that this object's alarm state has gone to Attend To Dependent.
Alarm state changed timestamp Read only The time at which the Alarm state last changed.
Alarm events reset timestamp Read only The time at which the Attention Required alarm events was last reset to zero.