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-c hannel signaling for up to 23 B-channel ports o n the same circuit
pack.
In an NFAS signaling group, the 24th port of on e TN464C/D UDS1 Interface can
carry D-channel sig naling for B-channels on several other DS1 ci rcuit pack as
well, including TN767s and TN464Bs. The 24th port on the other circuit p acks
can be used for B-c hannels. A D-channel in an NFAS group can sig nal for
B-channels on a total of 20 DS1 circuit p acks.
NFAS duplex signaling provides increased reliability, which is highly desirable
since NFAS permits the D-channel to signal for many mo re B-channels. NFAS
Duplex allows the administration of a b ackup D-channel wh ich remains in a
standby state until the ac tive D-channel goes down. If the active D-Channel does
go down, the bac kup D-Channel takes over and p rovides signaling for all th e
B-channels in the signaling group.
The operation of the entire ISDN-PRI signaling group dep ends on several other
entities: the ISDN-PRI signaling channel ports, the TN464C/D UDS1 Interfac e
circuit pack on wh ich the D-channels reside an d the system link that is carried
over the packet bus to the p rocessor. When there are problems with the
ISDN-PRI sign aling gro up, also i nvest iga te ISDN -LNK, UDS1-B D, SYS-L INK. a nd
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
010 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#
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