BusinessPhone Communication Platform 4.0
Facilities

## ISDN General

## Definition

Integrated Services Digital Network, ISDN, is the definition of a digital telephone network according to CCITT. This network makes possible voice, video and data transmission on the same line.

For the connection of a PBX to the ISDN network, the user has two types of connection at his/her disposal, depending on the respective network operator.

### ISDN Basic Access (BA; 2B+D)

This access comprises 2 B-channels with a transmission rate of 64kb/s each, which are used for voice, video and data transmission, as well as one D-channel with a transmission rate of 16kb/s, which is used for signalling as well as data transmission. The B-channels are completely independent and, in case of a PBX, may be seen as two independent trunk lines for external traffic.

### ISDN Primary Rate Access (PRA; 30B+D)

This access comprises 30 B-channels, one synchronisation channel and one D-channel for signalling. As for a PBX, these 30 channels may be seen as independent trunk lines for external traffic.

ASB 150 02 supports the BA and PRA interface for connecting to public ISDN networks defined according to ACA (Australian Communication Authority) and
ETSI (European Telecommunications Standard Institute).

ASB 150 02 offers also the possibility to connect ISDN terminals on the extension side.

### S-Interface (2B+D)

This access enables the connection of up to eight logical data links (usually one per ISDN terminal) in passive bus configuration on the user side.

ISDN-terminals that are in compliance with the ACA (Australian Communication Authority) and ETSI recommendations (EURO - ISDN) as well as the country specific versions of the ETSI standard are supported on the S-interface.

## Use

With its various features, ISDN opens the door to trend-setting functions, such as CTI (Computer Telephony Intergration) which are used in all types of industries.

The ISDN-features are called “supplementary services“. Which services are offered or available to the end user depends on the network operator.

PRA‘s, BA‘s and S-interface´s scope of services in ASB 150 02 includes “Basic Call“ and supplementary services.

You will find a detailed description in the following chapters.

## Operation

See the following chapters.

## Capacity

See the following chapters.

## Limitations

See the following chapters.

## Programming

See the following chapters.

## Equipment

BTU-D with ISDN prom set or BTU-B_ or MFU.

Revision: H © Ericsson Enterprise 2003