Справочник Пользователя для Lucent Technologies R5SI
DEFINITY Enterprise Communications Server Release 5
Maintenance and Test for R5vs/si
Maintenance and Test for R5vs/si
555-230-123
Issue 1
April 1997
Maintenance Object Repair Procedures
Page 10-821
ISDN-TRK (DS1 ISDN Trunk)
10
Figure 10-59.
PRI Over PACCON DS1 ISDN Trunk Interactions (24-channel interface)
DS1 ISDN Trunk Service States
This section defines the possible service states of a DS1 ISDN trunk, explains the
reason for each service state, and provides the recommended recovery
procedures (when required).
reason for each service state, and provides the recommended 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 state when administered and it may also
be in this state if there is a failure on the B-channel attributed to a problem
on the far-end switch. The switch sends messages to the far-end to
negotiate the B-channel into service. If the far-end does not respond to the
messages within a certain time period, then the service state remains
out-of-service and maintenance will periodically resend the messages.
The trunk is unusable for outgoing calls. On US interfaces, the trunk is
unusable for incoming calls, but on non-US interfaces, incoming calls will
be accepted.
be in this state if there is a failure on the B-channel attributed to a problem
on the far-end switch. The switch sends messages to the far-end to
negotiate the B-channel into service. If the far-end does not respond to the
messages within a certain time period, then the service state remains
out-of-service and maintenance will periodically resend the messages.
The trunk is unusable for outgoing calls. On US interfaces, the trunk is
unusable for incoming calls, but on non-US interfaces, incoming calls will
be accepted.
Packet B us
D-C hannel
B -C hannels
TD M Bus
Processor
(TN 786)
Packet
C ontrol
Circuit
Pack
(TN778)
U D S1
Interface
C ircuit
Pack
(TN 464*)
IS D N-TRK
(B -Channel)
(B -Channel)
Voice or D ata
(Por t 1)
IS D N-TRK
(B -Channel)
(B -Channel)
Voice or Data
(Port 2)
IS D N-P LK
(D -C hannel)
(D -C hannel)
P rim ary S ignaling
Link
(Port 24)
IS D N-TRK
(B -Channel)
(B -Channel)
Voice or Data
(Port 23)
*TN 464 C or later
24-Channel