DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Object Repair Procedures
9-943ISDN-SGR (ISDN-PRI Signaling Group)
9
■ NFAS duplex signaling
In a FAS signaling group, the 24th port of the TN464C/D UDS1 Interface circuit
pack carries D-channel signaling for up to 23 B-channel ports on the same circuit
pack.
In an NFAS signaling group, the 24th port of one TN464C/D UDS1 Interface can
carry D-channel signaling for B-channels on several other DS1 circuit pack as
well, including TN767s and TN464Bs. The 24th port on the other circuit packs
can be used for B-channels. A D-channel in an NFAS group can signal for
B-channels on a total of 20 DS1 circuit packs.
NFAS duplex signaling provides increased reliability, which is highly desirable
since NFAS permits the D-channel to signal for many more B-channels. NFAS
Duplex allows the administration of a backup D-channel which remains in a
standby state until the active D-channel goes down. If the active D-Channel does
go down, the backup D-Channel takes over and provides signaling for all the
B-channels in the signaling group.
The operation of the entire ISDN-PRI signaling group depends on several other
entities: the ISDN-PRI signaling channel ports, the TN464C/D UDS1 Interface
circuit pack on which the D-channels reside and the system link that is carried
over the packet bus to the processor. When there are problems with the
ISDN-PRI signaling group, also investigate ISDN-LNK, UDS1-BD, SYS-LINK. and
PKT-BUS.
Error Log Entries and Test to Clear Values
Table 9-361. ISDN-PRI Signaling Group Error Log Entries
Error
Type
Aux
Data Associated Test
Alarm
Level
On/Off
Board Test to Clear Value
0
1
0 Any Any test sig-group
grp#
1 (a) Any None
257 (b) Any None test sig-group
grp#
513 (c) Any None test sig-group
grp#
769 Any Primary Signaling Link
Hardware Check (#636)
test sig-group
grp#
1025 Any Secondary Signaling Link
Hardware Check (#639)
test sig-group
grp#
1793 (d) Any Layer 2 Status (Test #647) WARNING OFF test sig-group
grp#
2049 (e) Any Layer 2 Status (Test #647) WARNING OFF test sig-group
grp#
2305 (f) Any Remote Layer 3 Query
(Test #637)
MINOR OFF test sig-group
grp#
Continued on next page
