DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Object Repair Procedures
9-956ISDN-TRK (DS1 ISDN Trunk)
9
On 24-channel interfaces, any of the first 23 ports on the DS1 circuit packs can
be a B-channel. On the TN464C/D UDS1 circuit pack, the 24th port may be used
as a B-channel or as a D-channel depending on the type of ISDN-PRI signaling
group (FAS or NFAS) implemented on the circuit pack. For more details, refer to
‘‘ISDN-SGR (ISDN-PRI Signaling Group)’’
P in this chapter. On the TN767 DS1
circuit pack, all 24 ports are used as B-channels since D-channel signaling is not
supported on the TN767 circuit pack. The signaling for these B-channels is done
over a D-channel located on a UDS1 TN464C/D board.
On 32 channel interfaces, any of ports 1-15 and 17-31 on the DS1 interface
circuit pack can be a B-channel. The 16th port may be used as a B-channel or as
a D-channel depending on the type of ISDN-PRI signaling group (FAS or NFAS)
to which it belongs. For more details, refer to ‘‘ISDN-SGR (ISDN-PRI Signaling
Group)’’ and "DS1-BD (DS1 Interface Circuit Pack)" in this chapter.
For interfaces using country protocol 1 on the DS1 circuit pack administration
form (including US), the signaling protocol used for the maintenance of the
B-channel is defined by the Lucent ISDN-PRI specification. For interfaces using
country protocols other than 1, the signaling protocol used for the maintenance
of the B-channel is defined by the CCITT ISDN-PRI Specification.
There are five possible service states for a B-channel. the service state is
negotiated with the far-end switch, changes over time, and may have a far-end
and near-end components. The service state is initialized to
out-of-service/Far-End and an attempt is made to negotiate it to in-service.
The Lucent ISDN-PRI Specification defines the possible SERVICE STATES for a
B-channel. The service state is negotiated with the far-end switch, changes over
time, and may have a far-end or near-end component. The service state is
initialized to the Out-Of-Service/Far-End state and an attempt is made to
negotiate it to In-Service.
NOTE:
The service state of a particular DS1 ISDN Trunk B-channel can be
displayed by issuing the
status trunk
trunk group/trunk member
system
technician command.
When a call is present, the specification defines the permissible call states as
well. There are tests in the short and long test sequences for DS1 ISDN Trunk
designed to audit these states and ensure agreement between both ends of the
PRI connection.
Alarming Based on Service States
A warning alarm is logged against a DS1 ISDN B-channel trunk when it is placed
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 present, use status
trunk group#/member# command to determine the exact state. Other alarms
can be diagnosed by using the short and/or long test sequences. Note that an
