DEFINITY ECS Release 8.2 Maintenance for R8.2csi
555-233-119 Issue 1
April 2000
Maintenance Objects
3-738ISDN-TRK (DS1 ISDN Trunk)
3
— Pending-maintenance (PMTC)
This state is supported only by systems using country protocol 1
(including US). The near-end has sent a B-channel maintenance
message to the far-end, requesting that the B-channel service state
be transitioned to maintenance. The far-end has a certain amount
of time to respond to the message. The service state will be PMTC
until either a response is received or the timer expires.
— Call Activity States
In addition to the service and pending state, the state of a
B-channel also reflects its call activity. If a call is connected over the
B-channel, then the state of the trunk will reflect the "active" call
state, for example, "in-service/active." If there is no call on the
B-channel, then the trunk will reflect the "idle" call state, for
example, "OOS/FE-idle."
The following diagram of the DS1 ISDN Trunk service states shows the
common progression from one service state to another and the event that
caused the change of state.