User Guide

DEFINITY Enterprise Communications Server Release 5
Maintenance and Test for R5vs/si
555-230-123
Issue 1
April 1997
Maintenance Object Repair Procedures
Page 10-803ISDN-SGR (ISDN-PRI Signaling Group)
10
If no other symptoms are not present, no action is required. If Layer 3
communication is down, there should be indications in the form of alarms
and errors for link components. Check out other errors against ISDN-SGR,
ISDN-TRK, and other hardware components on the link.
There is no test to clear these errors. The error counter is decremented by
1 every 15 minutes.
b. This error indicates that the primary signaling channel connection has
been lost for more than 90 seconds. If a secondary signaling channel
does not exist or is not in-service, the associated B-channels will be
placed in the ISDN Maintenance/Far-End state. The B-channels will not be
usable for outgoing calls, although incoming calls will still be accepted.
The switch will automatically attempt to recover the signaling link. Pay
particular attention to the results of Test #636 (Primary Signaling Link
Hardware Check) in the test sequence. When the link does recover, the
B-channels will be negotiated back to the In-Service state and their alarms
will be retired.
When this error occurs, the state of the Signaling Group is changed to
out-of-service (verify using the status sig-group command).
c. This error indicates that the secondary signaling channel connection has
been lost for more than 90 seconds. If the primary signaling channel is not
in-service, B-channels will be placed in the ISDN Maintenance/Far-End
state. The B-channels will not be usable for outgoing calls, although
incoming calls will still be accepted. The switch will automatically attempt
to recover the signaling link. Pay particular attention to the results of Test
#639 (Secondary Signaling Link Hardware Check) in the test sequence.
When the link does recover, the B-channels will be negotiated back to the
In-Service state and their alarms will be retired.
When this error occurs, the state of the Signaling Group is changed to
out-of-service (verify using the status sig-group command).
d. This error indicates a failure of the Layer 2 Status Query Test for the
primary signaling channel
e. This error indicates a failure of the Layer 2 Status Query Test for the
secondary signaling channel.
f. A specific message was sent to the far-end switch, and it did not respond
within the allotted time. Investigate elements of the ISDN PRI D-channel(s)
(ISDN-LNK, ISDN-PLK, ISDN-SGRP, PI-LINK, PI-PT, PKT-CTRL) for both
this switch and the Far-end switch. If Test #637 fails twice in a row, the
B-channels will be alarmed and made unavailable for outgoing calls
(although incoming calls will still be accepted). When Test #637 succeeds
and the Far-end switch starts responding properly, the DS1 ISDN Trunk
(B-channels) will be placed back into normal operation and their alarms
will be retired.