BusinessPhone Communication Platform 7.0
Facilities

## Subsystem

## Definition

ASB 150 02 used as subsystem means that the trunks in ASB 150 02 are connected to analogue extension positions in a superior system PBX, key system, etc.

## Use

The function is used when an existing larger system is to be complemented with one or more ASB 150 02 systems.

The function can also be used when the public exchange allows the ordering of facilities such as inquiry and transfer.

The function means that extensions in ASB 150 02 can initiate inquiry and transfer in the superior system.

## Operation

### Inquiry

Inquiry in the superior system is initiated by depression of the R-key programmed for the function (different key as used for the internal inquiry)

A connected trunk in ASB 150 02 will then initiate a break that the superior system interprets as the recall signal.

The extension receives dial tone from the superior system and can then dial the required extension number.

### Transfer

Transfer in the superior system is undertaken by replacing the handset.

Note

Renewed depression of the key will result in a new recall signal whose function is dependent on the superior system. For continued operation, see the “Instructions for Use” applicable for the superior system.

## Capacity

The number of trunks to the superior system is limited by the total number of trunks.

This number should not to exceed 60.

## Limitations

As the scope of the facility is dependent on the ability of the superior system to interpret the register recall signals, it is first necessary to analyse how the extension positions in the superior system interprete signals.

Note

An inquiry to a superior system means that there will be no TCD-analysis in conjunction with number dialling. An extension who has been assigned a key for inquiries to the superior system must be regarded as fully open for external traffic. Other TCD-analysis must be undertaken in the superior system.

## Programming

0301 |  | Key function

Enter function code = 25.

Following commands are only accessable via BMS:

1417 |  | Length of external inquiry signal

1018 |  | Subsystem to PBX?

## Equipment

System Telephones.

Revision: E © Ericsson Enterprise 2005