DEFINITY ECS Release 8.2 Maintenance for R8.2csi
555-233-119 Issue 1
April 2000
Maintenance Objects
3-736ISDN-TRK (DS1 ISDN Trunk)
3
NOTE:
The service state of a particular DS1 ISDN Trunk B-channel can b e
displayed by issuing the status trunk <trunk_group/trunk_member>
system technician comman d.
If a call is present, the Specific ation defines the permis sible Call States as well.
There are tests in the Short and Long Test Sequences for DS1 ISDN Trunk
designed to aud it these states and ensure agreement bet ween both ends of the
PRI connection.
Alarming Based on Service States
A warning alarm is logg ed against a DS1 ISDN B-channel trunk when it is p laced
in the Maintenance/Far-End or Out-Of-Service/Far-End states, during which the
trunk is unusable for outgoing calls. When a warning alarm is p resent, use status
trunk group#/member# command to determine the exac t state. Other alarms
can be diag nosed by using the short and/or long test sequenc es. Note that an
ISDN B-channel trunk can be p laced in a Far-End service state b y either action
taken by the far-end switch or by failure of the far-end switch to resp ond. For
example, if the far-end does not respond to a Remote Layer 3 Query (Test #637
for ISDN-SGR), the associated DS1 ISDN trunk B-channels is placed in the
Maintenance/Far-End service state.
As a port on a DS1 circuit pac k (DS1-BD or UDS1-BD), and as part of a signaling
group depend ent on a D-channel (ISDN-PLK) for signaling, op eration of the
ISDN-TRK is dependent on the health of these other maintenance ob jects.
DS1 ISDN Trunk Service States
This section defines the possib le service states of a DS1 ISDN trunk, explains the
reason for each service state, and provides the recommend ed recovery
procedures (when required ).
Service States
■In-Service (INS)
The B-channel is in its normal operating state.
■Out-of-Service/Far-end (OOS/FE)
A B-channel is initialized to this s tate when administered and it m ay also
be in this state if there is a failure on the B-channel attrib uted to a problem
on the far-end switch. The switch send s messages to the far-end to
negotiate the B-channel into servic e. If the far-end does not respond to the
messages within a certain time p eriod, then the service state remains
out-of-service and maintenanc e will periodically resend the messages.