DEFINITY ECS Release 8.2 Maintenance for R8.2csi
555-233-119 Issue 1
April 2000
Maintenance Objects
3-737ISDN-TRK (DS1 ISDN Trunk)
3
The trunk is unusable for outgoing c alls. On US interfaces, the trunk is
unusable for incoming calls, but on non-US interfaces, inc oming calls will
be accepted.
■Out-of-Service/Near-end (OOS/NE)
This is the state of the trunk when a hardware failure exists on the link, the
NPE Crosstalk Test fails, or when the trunk is busied out b y system
technician. In this state, the trunk is unus able for incoming or outg oing
calls. No messages are sent to the far-end until the signaling link c omes
back into service or the tr unk is released by system technic ian.
■Maintenance/Far-end (MTC/FE)
This state is reached when the far-end d oes not respond to messages
sent over the signaling link for a p articular trunk after a certain amount of
time. This state is different from OOS/FE since the signaling link must have
initially been up and the B-c hannels in-service. The switch will p eriodically
send messages to the far-end to try to negotiate the trunk (B-chann el) into
service. The trunk is unusable for outg oing calls but will servic e incoming
call requests from the far-end. Note that tran sitions into MTC/FE do not
drop stable ca lls. Therefore, if the service state changes from in-servi ce to
MTC/FE, then stable calls are unaffected.
■Maintenance/Near-end (MTC/NE)
The trunk (B-channel) is in this state if the signaling link (PKT-INT) is
busied out by system tec hnician. The trunk (B-channel) is also tempo rarily
in this state if system technician has iss ued a test trunk trunk_
group/trunk_member long command. This command will exec ute the
ISDN-PRI test call. This test will change the state of the trunk member to
MTC/NE for the duration of the test unless a call request comes in from the
far-end. In that case, the test would abort. Note that transitions into
MTC/NE do not drop stable calls . Therefore, a system technician-
demanded busyout link lnk-no command will not drop stable trunk c alls.
In this state, the B-channel is not usable fo r new outgoing calls, b ut is
available for incoming c alls and outgoing test calls.
■Pending States
If the near-end is expecti ng a timed response from the far-end for a
request to change the servic e state of a trunk, then the state of the trunk
reflects a Pending State.
— Pendi ng-in-service (PINS)
The near-end has sent a B-channel maintenanc e message to the
far-end, requesting that the B-c hannel service state be transitioned
to in-service. The far-end has a cer tain amount of time to respond to
the message. The service state will be PINS until either a response
is received or the timer expires.