Error Log Entries And Test To Clear Values - Avaya G700 Maintenance Manual

6 Avaya MultiVantage Software-Controlled Maintenance:
Note: Throughout this discussion the term B-channels refers to ISDN-TRKs or PE-
BCHLs, depending on the application under investigation.
The MM710 Interface Media Module, which has a direct interface to the packet bus, is required for
D-channel signaling. There are two types of DS1 interfaces:
• 24 DS0 channels on a 1.544 Mbps link
• 31 DS0 channels + 1 framing channel on a 2.048 Mbps link
The following discussion describes 24-channel interface signaling groups. The 32-channel interface
works the same way, except that only port number 16 is used for signaling instead of port number 24.
Ports 1 through 15 and 17 through 31 are used for B-channels. The 32nd channel (port 0) is always
used for framing.
ISDN-PRI D-channel signaling can be combined with a group of B-channels in three basic ways:
• Facility-associated signaling ( FAS )
• Nonfacility-associated ( NFAS ) simplex signaling
• NFAS duplex signaling
In a FAS signaling group, the 24th port of the DS1 MM Interface Media Module carries D-channel
signaling for up to 23 B-channel ports on the same Media Module.
In an NFAS signaling group, the 24th port of one DS1 MM Interface can carry D-channel signaling
for B-channels on several other DS1 Media Module as well, including TN767s and TN464Bs. The
24th port on the other Media Modules can be used for B-channels. A D-channel in an NFAS group
can signal for B-channels on a total of 20 DS1 Media Modules.
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 DS1-MM Interface Media Module 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, DS1-MM, and SYS-LINK.

Error Log Entries and Test to Clear Values

Table 35. ISDN-PRI Signaling Group Error Log Entries
Error
Type
0*
1 (a)
166
Aux Associated Test
Data
0 Any
Any None
ISDN-SGR (ISDN-PRI Signaling Group)
Alarm On/Off
Level Board
Any
Maintenance for S8300/S8700 and G700
555-234-101 — Issue 2 — October 2002
Test to Clear
Value
test sig-group
grp#
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