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 b y 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 s tate
be transitioned to maintenanc e. The far-end has a certain amount
of time to respond to the messag e. 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 s tate, the state of a
B-channel also reflects its c all activity. If a call is connec ted over the
B-channel, then the state of the trunk will reflec t the "active" call
state, for example, "in-service/active." If there is no call o n 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 servic e state to another and the event that
caused the change of state.