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Communication Manager Maintenance-Object Repair Procedures
1430 Maintenance Procedures for Avaya Communication Manager 3.0, Media Gateways and Servers
ISDN-PRI D-channel signaling can be combined with a group of B channels in three basic ways:
● FAS (facility-associated signaling)
● NFAS (non-facility-associated signaling)
● Backup NFAS signaling
In a FAS signaling group, the 24
th
port of the TN464 UDS1 Interface circuit pack or MM710 DS1
Interface Media Module carries D-channel signaling for up to 23 B-channel ports on the same
circuit pack or media module.
In an NFAS signaling group, the 24
th
port of one TN464C or higher suffix UDS1 Interface or
MM710 DS1 Interface Media Module can carry D-channel signaling for B channels on several
other DS1 circuit packs or DS1 Media Modules, as well, including TN767s and TN464Bs. The
24
th
port on the other circuit packs or media modules 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 or media
modules.
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:
● S8700 | 8710 / S8500 / S8300: The ISDN-PRI signaling channel ports, the TN464 UDS1
Interface circuit pack or MM710 DS1 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-PLK
(ISDN-PRI Signaling Link Port) on page 1423, UDS1-BD (UDS1 Interface Circuit Pack) on
page 2374, MG-DS1 (DS1 Interface Media Module)
on page 1594, SYS-LINK (System
Links) on page 2175, and PKT-INT (Packet Interface) on page 1799, as appropriate.
Error Log Entries and Test to Clear Values
Table 514: ISDN-PRI Signaling Group Error Log Entries
Error
Type
Aux
Data
Associated Test Alarm
Level
On/Off
Board
Test to Clear Value
0 (a)0 Any Any test signaling-group grp#
1 (b
) Any None
257 (c
) Any None test signaling-group grp#
513 (d
) Any None test signaling-group grp#
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