User`s guide

3(44)
Datum/Date Rev
Dokumentnr/DocumentnrUppgjord/Prepared
Dokansv/Godkänd - Doc respons/Approved Kontr/Checked Tillhör/Referens-File/Reference
99-07-15 G
268/155 34-ASB 150 02 Uen
FACILITY DESCRIPTION
Faktaansvarig - Subject responsible
ISDN BASIC ACCESS
ISDN PRIMARY RATE ACCESS
DEFINITION
The ISDN ( PRA / BA ) trunk lines of ASB 150 02 make
possible the access to an ISDN network specified
according to ACA, ETSI standards and also country-
specific versions of the ETSI standard.
The PRA comprises 30 B-channels, one
synchronisation channel and one D-channel. The BA
comprises 2B channels and one D-channel.
In case of the BA, the ASB 150 02 system can be
connected to the Network Terminator in a point to point
or point to multipoint configuration
PRA's and BA’s scope of services in ASB 150 02
includes “Basic Call“ and the following supplementary
services.
• DDI Direct Dialling In
• AOC Advice of Charge
• CLIP Calling Line Identification Presentation
• CLIR Calling Line Identification Restriction
• COLP Connected Line Identification
Presentation
• COLR Connected Line Identification
Restriction
• MCID Malicious Call Identification
• MSN Multiple Subscriber Number
• SUB Sub-addressing
You will find a detailed description in the following
chapters.
At first initialisation of the PBX, a directory number
starting with 700 upwards is assigned to each trunk
individual, according to the number of B-channels.
Compared to analogue trunks or digital CAS-lines
there is normally no relation between the trunk
individual and the B-channel (corresponds to the
physical external line in the analogue world )
PRA's and BA's B-channels may be seen as
independent trunk lines, although it is only possible to
seize one outgoing direction.
USE
See 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 OUTGOING EXTERNAL CALLS,
document 381/155 34-ASB 150 02 Uen,
and
INCOMING EXTERNAL CALLS,
document 262/155 34-ASB 150 02 Uen.
CAPACITY
The maximum number of trunk lines is determined by
the number of speech channels in the system ( 60 ).
32 different public numbers can be assigned to the
trunks. Up to 16 digits can be programmed per public
number.
LIMITATIONS
Transit traffic to another trunk line (ISDN or analogue )
is allowed but no ISDN facilities are supported.
Supplementary services are always valid for the
complete link.
In case of outgoing traffic it is possible in ASB 150 02
to create groups of channels for defined purposes
( e.g. tenant groups) but it depends on the national
network operator if this is also supported.
In case of incoming traffic it is not possible to assign B-
channels to specific groups. If special applications like
ACD-groups require dedicated trunk resources a
complete link ( PRA or BA ) has to be used without
DDI subscription.