Server Alarms - Avaya Support

ISDN-TRK (DS1 ISDN Trunk)
On 24-channel interfaces, any of the first 23 ports on the DS1 circuit packs or media modules
can be a B-Channel. On the TN464C or higher suffix UDS1 circuit pack or DS1 Media Module,
the 24 th port may be used as a B-Channel or as a D-Channel depending on the type of
ISDN-PRI signaling group (FAS or NFAS) implemented on the circuit pack or media module.
For more details, see ISDN-SGR (ISDN-PRI Signaling Group). On the TN767 DS1 circuit pack,
all 24 ports are used as B-Channels since D-channel signaling is not supported on the TN767
circuit pack. The signaling for these B-Channels is done over a D-Channel located on a UDS1
TN464C or higher suffix board.
On 32-channel interfaces, any of ports 1 – 15 and 17 – 31 on the DS1 interface circuit pack or
media module can be a B-Channel. The 16 th port may be used as a B-Channel or as a
D-Channel depending on the type of ISDN-PRI signaling group (FAS or NFAS) to which it
belongs. For more details, see ISDN-SGR (ISDN-PRI Signaling Group) and DS1-BD (DS1
Interface Circuit Pack) or MG-DS1 (DS1 Interface Media Module).
For interfaces using country protocol 1 on the DS1 circuit pack or media module administration
form (including US), the signaling protocol used for the maintenance of the B-Channel is
defined by the Avaya ISDN-PRI specification. For interfaces using country protocols other than
1, the signaling protocol used for the maintenance of the B-Channel is defined by the CCITT
ISDN-PRI Specification.
There are five possible service states for a B-Channel. The service state is negotiated with the
far-end switch, changes over time, and may have far-end and near-end components. The
service state is initialized to Out-of-Service/Far-End, and an attempt is made to negotiate it to
In-Service.
Note: The
Note:
service state of a particular DS1 ISDN Trunk B-Channel can be displayed by
entering status trunk grp#/mem# on the system access terminal.
When a call is present, the specification defines the permissible call states, as well. There are
tests in the short and long test sequences for DS1 ISDN Trunk designed to audit these states
and ensure agreement between both ends of the PRI connection.
Communication Manager Release 5.0 Issue 4 January 2008 929