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DEFINITY Enterprise Communications Server Release 5
Maintenance and Test for R5vs/si
555-230-123
Issue 1
April 1997
Maintenance Object Repair Procedures
Page 10-821ISDN-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).
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.
Packet Bus
D-Channel
B-Channels
TDM Bus
Processor
(TN786)
Packet
Control
Circuit
Pack
(TN778)
UDS1
Interface
Circuit
Pack
(TN464*)
ISDN-TRK
(B-Channel)
Voice or Data
(Port 1)
ISDN-TRK
(B-Channel)
Voice or Data
(Port 2)
ISDN-PLK
(D-Channel)
Primary Signaling
Link
(Port 24)
ISDN-TRK
(B-Channel)
Voice or Data
(Port 23)
*TN464 C or later
24-Channel