User`s guide

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Datum/Date Rev
Dokumentnr/DocumentnrUppgjord/Prepared
Dokansv/Godkänd - Doc respons/Approved Kontr/Checked Tillhör/Referens-File/Reference
97-10-31 D
486/155 34-ASB 150 02 Uen
FACILITY DESCRIPTION
Faktaansvarig - Subject responsible
SEA/TB/MP T.Preißner
SEA/TB/MP ASB 150 02
SEA/TB/XE
TRUNK
Definition
A trunk (external line) is a physical connection be-
tween ASB 150 02 and its environment.
Trunks can be analogue or digital.
Trunks are used particulary for:
• Lines to the public exchange
• Lines to a superior PBX
Analogue trunks can also be used for:
• Music/information source for music on hold and
background music
• External paging equipment
Analogue trunks
Analogue trunks (eight units per board) are used
mainly for connection to old, analogue public
exchanges.
Analogue trunks are also used for the connection of
paging equipment and music sources.
To minimise distortion on lines due to impedance
mismatches the feature Automatic Trunk Impedance
Adaption (ATIA) can be enabled via RASC for each
trunk and tie line. This function adapts to the best
possible impedance balance automatically.
Command 1033 can only be envoked if command
1032 is enabled. This feature must not be used on
lines where the connected terminals already have a
selfadapting functionality e.g. modems, fax mashines
etc.
Digital trunks
Digital trunks are used for connection to modern, digit-
al public exchanges. The following digital trunks are
supported by ASB 150 02
• 2Mb/s CAS trunk ( 30 channels )
• 2Mb/s ISDN trunk ( 30 channels )
• 192kb/s ISDN trunk ( 2 channels )
For further information about ISDN-trunks,
see document 268 / 155 34-ASB 150 02 Uen
Directory numbers
On system start, each trunk is assigned automatically
a directory number from 700 and upwards.
Routes
Several trunks that go to the same terminal point and
that are to be called with the same directory number
can be placed in one route. 32 different public numbers
can be assigned to the trunks. Up to 16 digits can be
programmed per public number. On initiation all trunks
are placed in route 0.
See also under "ROUTE SELECTION",
document 444/155 34 ASB 150 02 Uen.
Use
See also under "OUTGOING EXTERNAL CALLS",
document 381/155 34 ASB 150 02 Uen
and "INCOMING EXTERNAL CALLS",
document 262/155 34 ASB 150 02 Uen.
Operation
See also under "OUTGOING EXTERNAL CALLS",
document 381/155 34 ASB 150 02 Uen
and "INCOMING EXTERNAL CALLS",
document 262/155 34 ASB 150 02 Uen.
486.fm
Database reference