Isdn-Trk (Ds1 Isdn Trunk) - Avaya Definity SI Maintenance Manual

ISDN-TRK (DS1 ISDN Trunk)

ISDN-TRK (DS1 ISDN Trunk)
MO Name (in
Alarm Log)
1
ISDN-TRK
ISDN-TRK
ISDN-TRK
1 For additional repair information, refer to the
maintenance object.
2 A MAJOR alarm on a trunk indicates that alarms on these trunks are not
downgraded by the set options command and that at least 75 percent of the trunks
in this trunk group are alarmed.
A DS1 ISDN Trunk is known as a B-channel. It is a 64 kbps Bearer channel that
can be used to transmit digital traffic, be it voice or data. These trunks use a
separate channel for signaling (for example, for call setup); this mode of operation
is known as out-of-band signaling, as opposed to in-band, robbed-bit signaling,
where the signaling traffic flows over the same channel as the voice or data traffic.
The separate signaling channel is called a D-channel in ISDN terminology, and it
carries all the call control signaling messages for the DS1 ISDN Trunk
B-channels. The D-channel for these B-channels is an ISDN-PRI (Primary Rate
Interface) Signaling Link Port (ISDN-LNK/ISDN-PLK).
On 24-channel interfaces, any of the first 23 ports on the DS1/UDS1 interface
circuit pack can be a B-channel. The 24th port may be used as a B-channel or as
a D-channel depending on the type of ISDN-PRI Signaling Group (ISDN-SGR) to
which it belongs. On 32 channel interfaces, any of ports 1-15 and 17-31 on the
DS1 interface circuit pack can be a B-channel. The 16th port may be used as a
B-channel or as a D-channel depending on the type of ISDN-PRI Signaling Group
(ISDN-SGR) to which it belongs. For more details, refer to the ISDN-SGR and
DS1-BD/UDS1-BD Maintenance documentation.
NOTE:
If a Packet Control circuit pack is used instead of a Processor Interface Link
as the interface of the PBX SPE to the D-channel, then the signaling link
port on the UDS1 circuit pack is referred to as ISDN-PLK and only the
TN464C or later may be used to carry D-channel Signaling. The B-channels
may be carried by any DS1/UDS1 interface circuit pack. If a Processor
Interface is used for connectivity then the Signaling Link port is referred to
as a ISDN-LNK and the TN767 or TN464B or later DS1 interface circuit pack
may be used to carry D-channels Signaling.
For interfaces using country protocol 1 on the DS1 Circuit Pack administration
form (including US), the signaling protocol used for the maintenance of the
B-channel is defined by the AT&T ISDN-PRI Specification.
555-233-123
Initial Command to
Alarm Level Run
2
MAJOR test port PCSSpp l
MINOR test port PCSSpp l
WARNING test port PCSSpp sh
''DS1-BD (DS1 Interface Circuit Pack)''
Full Name of MO
DS1 ISDN Trunk
DS1 ISDN Trunk
DS1 ISDN Trunk
Issue 4 May 2002 10-977