User`s guide

2(14)
Datum/Date Rev
Dokumentnr/DocumentnrUppgjord/Prepared
Dokansv/Godkänd - Doc respons/Approved Kontr/Checked Tillhör/Referens-File/Reference
99-07-15 F
361/155 34-ASB 150 02 Uen
FACILITY DESCRIPTION
Faktaansvarig - Subject responsible
Open number plan (variable number length)
Each outgoing tie line route is assigned to a ROUTE
ACCESS NUMBER. This number is used for the
selection of the desired exchange of the private net-
work.
After dialling the ROUTE ACCESS NUMBER you may
dial the directory number of an extension or the route
access number to aNother exchange.
Coordinated number plan (fixed number length)
All interconnected exchanges in the private network
share a common numbering plan. Each exchange
uses a unique first digit in its numbering plan. This first
digit determines the exchange that is called.
ASB 150 02 either calls an extension within the actual
exchange or forwards the call to aNother exchange.
The extension is called if the leading digits belong to
the exchange that has received the number. If the first
digit belongs to aNother exchange, ASB 150 02
forwards the call to the correspondent route. The
called exchange receives the dialled number –
including the first digit (pre-digit) – for further analysis.
All routes and pre-digits have to be programmed for
each exchange within the network, even if the routes
use the same physical tie lines.
Example:
Three exchanges are connected via tie lines using a
coordinated number plan. The exchange named "PBX
C“, has "3“ as first digit in its numbering plan.
An extension within PBX A dials the digits 3XXX. The
exchange selects one of the free lines in route 3 and
transmits the pre-digit 3 followed by the remaining
digits to PBX B (the exchange connected to route 3).
PBX B analyses the received digits (3XXX) to forward
the call to PBX C.
TRAFFIC OPTIONS
Outgoing traffic
Outgoing traffic can be automatic or manually
transferred via the operator
( for more informations, see OPERATOR,
document 380/155 34-ASB 150 02 Uen ).
Automatic traffic
By dialling the appropriate directory number (ROUTE
ACCESS NUMBER) one free individual in the route to
the inter-working exchange is selected. The exchange
then sends the called directory number to the inter-
working exchange.
Manual traffic
In the event that the route has a limited number of lines
or if it is a matter of a distant and expensive
connection, it may be desirable to allow the operator to
control traffic.
The extension then calls the operator who either
transfers the line with dial tone or calls B-extension
and then transfers the call.
Alternative routing
Alternative routing offers two alternative choices per
route when the desired route is busy. ASB 150 02
adds up to ten digits before the original dialled number
to access the alternative route.
Alternative routing via the public network is
particularly beneficial if the public network offers the
DIRECT-IN-DIALLING (DID) facility.
PBX A
(numbering plan 1xxx)
PBX B
(numbering plan 2xxx)
PBX C
(numbering plan 3xxx)