Siemens Aktiengesellschaft

Gunther Beckinger

Thomas Rambold

Gerhard Egler

In each case, a common interface module is assigned to subscriber lines and/or trunk groups. This interface module is connected both to the speech path switching network and, via a data transmission trunk group, to a central controller which establishes the switching paths. The information is transmitted via the speech path switching network using pulse code modulation. To provide central control for the telephone exchange, the information is transmitted via a data transmission trunk group using a message format with variable data length (HDLC procedure). Each interface module is assigned an interface circuit for transmitting information to and receiving information from the connected subscriber lines and/or trunk lines, for buffering speech and signal information, and for monitoring status. Speech and signal information are transmitted based upon the control commands of the central controller and based upon a peripheral controller assigned to the interface module. A transmitting and receiving unit assigned to this module makes it possible not only to transmit information via the data transmission trunk group to the central control, using a message format with variable data length, but also to convert this information into pulse frames, transmitted with pulse code modulation, which are appropriate for transmitting information via the speech path switching network. This fully integrable interface module should make it possible to transmit data in addition to speech information via the speech path switching network using a fully integrable interface module allocated to a group of subscriber stations and trunks.

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Unterpfaffenhofen, Germany

Gunther Beckinger