Avaya S8700 - Page 1699

ISDN-SGR (ISDN-PRI Signaling Group)
Issue 1 May 2002
8-977555-233-143
In a FAS signaling group, the 24
th
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 24
th
port of one TN464C/D UDS1 Interface can
carry D-channel signaling for B channels on several other DS1 circuit packs as
well, including TN767s and TN464Bs. The 24
th
port on the other circuit packs can
be used as a B channel. A D channel in an NFAS group can signal for B channels
on a total of 20 DS1 circuit packs.
D-channel backup provides increased reliability, which is highly desirable since
NFAS permits a D channel to signal for many more B channels. NFAS allows the
administration of a backup D channel that remains in a standby state until the
active D channel goes down. If so, the backup D Channel takes over and
provides signaling for every B channel 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 (ISDN-PRI Signaling Link
Port)’’, ‘‘UDS1-BD (UDS1 Interface Circuit Pack)’’, ‘‘SYS-LINK (System Links)’’,
and ‘‘PKT-BUS (Packet Bus)’’.
Error Log Entries and Test to Clear Values
Table 8-386. ISDN-PRI Signaling Group Error Log Entries
Error
Type
Aux
Data Associated Test
Alarm
Level
On/Off
Board Test to Clear Value
0
1
0Any 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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