Broadband pabx

The invention is based on a broadband PBX to the switching of video, audio and data messages.

The public switched broadband network VBN of Deutsche Bundespost permits transmission of image and sound in TV quality, at a data rate of 140 Mbit / s. The VBN provides a broadband Selbstwählnetz for a large number of broadband terminals participating as TV phones, videoconferencing. Each participant will have a 140-Mbit / s signals in video, audio and data signals changing subscriber line unit TAE with the VBN connected. over such a subscriber unit may also include a broadband PBX to the VBN be connected. This known broadband PBX consists of a video switching matrix, an audio switching matrix and a central controller. About this system, up to 15 users access to video communications to the VBN. Each broadband terminal includes to its own videophone controller and a remote operator console for controlling the connection setup and for signaling in VBN (P. Pernsteiner, F. Brendel, ntz Volume 42 (1989), No. 8, pages 486-493).

By any broadband terminal associated remote operator station, a subscriber terminal unit TAE for 15 participants will be of practical use, however, are not a PBX distinctive features, ie any internal and external connections, possible.

From US-3997736 further comprises a broadband PBX is known in which a broadband switching for switching a broadband connection between a calling and a called subscriber terminal, separated by a regular coupling field exists. Subscriber terminals are connected to the regular switching network and via a respective broadband unit with the broadband switching. For the construction of a broadband connection to connect via the switching network from the calling to the called subscriber terminal first in the usual manner. A broadband control circuit evaluates in this connection resulting signals, which are allocated to the two subscriber terminals, and establishes a broadband connection between the two subscriber terminals respectively associated broadband units through the broadband switching on.

The object of the invention is to realize a broadband PBX, when all connected devices are employable without a specifically associated remote operator station.

This object is inventive approximately achieved by the technical teaching of the main claim.

Because according to the invention associated with a broadband switching broadband terminals are connected to a known narrow band telephone PBX as "normal" narrowband telephone subscriber and also a signaling conversion module bidirectional signaling conversion - broadband network VBN and telephone PBX - performs in a predetermined Telephonic PBX usual signaling, all able connected broadband terminals are conveyed without any broadband device requires its own remote operator station. Thus, all features of the telephone private branch exchange can be provided to the broadband terminal devices also advantageously.

All broadband equipment can then autonomously assemble and disassemble connections.

Particularly advantageously, the inventive use of a digital voice memory in the signaling conversion module further is because all the necessary signals converted to speech and thus be understood by the participants. The voice-activated user interface can be an inexpensive telephone PBX to control the connecting and disconnecting can be used without the signaling implementation changes are necessary.

In addition, in an advantageous embodiment of the invention, a signaling adaptation to various public networks, such as via a subscriber line unit for networks with a transmission speed of 2 Mbit / s or an integrated services network (ISDN) in that the signaling conversion module is reprogrammed accordingly.

Further advantageous embodiments of the subject invention are disclosed in the dependent claims.

An embodiment is explained below with reference to the drawing.

The drawing shows a block diagram of a broadband PBX invention.

A broadband PBX BB-PABX according to the invention, consists of a broadband switching array BB-V, which is a built in space switch matrix with 32 inputs / outputs for be through broadband signals (video, audio, data) substantially. The broadband switching contains decoders for addressing the crosspoints, memory for holding the switch-on or Ausschaltinformation and a serial interface (V24) for control data.

Such a broadband switching array BB-V, as used in the embodiment is available from SVT Video Systems, Ltd., Essex, England under the name of AVS 264 Video Matrix.

are at the marked 1 to 24 inputs / outputs of the broadband switching array BB-V, as shown in the figure, 24 with BB-E1 to BB-E24 designated broadband terminals via one optical transmission path OUE, in the corresponding electro / optical E / O and optical / electrical converter O / e are inserted, connected.

The switchable via the broadband switching array BB-V analog signal comprises a video signal with two audio channels FBASTT and two data channels DD and is for further processing in each terminal BB-E1, ..., BB-E24 implemented through respective multiplexer / demultiplexer MUX.

The broadband terminals can be eg tele-video equipment, multifunctional workstations or even a video conference room BB-E24. The production of video conferences a videoconference set via multiplexers / demultiplexers MUX to the inputs / outputs of the broadband switching array BB-V denoted by 28 to 30, according as the broadband terminals connected.

Another geographical locations with 25 input / output of the broadband switching array BB-V is connected via an appropriate multiplexer / demultiplexer MUX with a subscriber terminal unit TAE for a public-switched broadband network VBN of the German Post Office in order to produce external broadband connections.

Optional is a first with 27 designated additional input / output of the broadband switching array BB-V via a corresponding multiplexer / demultiplexer MUX with a first additional subscriber line unit TAE1 for networks with a transmission speed of 2 Mbit / s (video conferencing, for example via satellite) and a second additional with 26 designated input / output of the broadband switching array BB-V via a corresponding multiplexer / demultiplexer MUX with a second additional subscriber line unit TAE2 for an integrated services network - ISDN - connected.

Furthermore, a narrow band telephone PBX SB-PABX via the serial V-24 interface and a narrowband / broadband connection computer SB / BB-C is connected to the broadband switching array BB-V; to control the construction and dismantling of broadband connections. To the telephone private branch exchange 24, the broadband terminals are also connected to the inputs designated namely having 1 to 24 / outputs. The broadband devices such as narrowband telephone subscriber via conventional 2-wire interfaces are connected to the telephone PBX and can thus as usual telephone sets are mediated.

Given as a narrowband telephone subscriber with a further input / output 25 of the telephone private branch exchange SB-PABX and via a signaling channel ZGK with the subscriber terminal unit TAE for the broadband switching network VBN a narrowband / broadband signaling conversion module VBNA is also inventively connected firstly.

Optionally, with 26 and 27 designated inputs / outputs of the telephone PBX for signaling conversion via additional signaling conversion modules with the first additional subscriber line unit TAE1 or with the second subscriber terminal unit TAE2 connected.

also (not shown) to be connected to the subscriber telephone private branch exchange SB-PABX, both analogue and digital (ISDN) are trunks AL connected to the public telephone network. However, only the ausgestatt ended with broadband terminals participants build links the authority over the broadband network VBN.

To be able to make an internal or external broadband connection, a narrow band telephone connection is always on the telephone private branch exchange SB-PABX. For this purpose, the signaling conversion module VBNA a computer unit comprising a microprocessor (eg from the family MCS 51 OF Intel) with associated program and working (eg EPROM and RAM) and a signaling transmitter / receiver, preferably a multi-frequency code transmitter / receiver, and a digital speech memory , The signaling channel ZGK is also connected via an HDLC (High Level Data Link) connected to the signaling conversion module.

The signaling conversion module VBNA sets one for the broadband network VBN according FTZ Directive 141R50 predetermined signaling in a predetermined Telephonic PBX signaling after the multifrequency code dialing method by which (as will be explained) in particular for the coming of the subscriber terminal unit TAE signaling via display of prompts a voice-controlled user guidance is ,

Starting from a rest condition (not mediated) of the broadband PBX BB-PABX, the case of an outgoing occupancy in the broadband switching network VBN will be described first.

Given first is a narrowband connection in the telephone private branch exchange SB-PABX from a subscriber A, eg the broadband terminal BB-E1, constructed for signaling conversion module VBNA, having the status of another telephone subscriber of telephone PBX. Now, is controlled by the microprocessor, an announcement "dial tone" from the voice memory read and sent to the subscriber A for signaling the choice for recording. At the same time the multi-frequency code transmitter / receiver is switched to the mode "Receive" to accommodate the now discharged from the subscriber A via the narrowband speech channel selection, that is, to detect multifrequency tone pairs. The received tone pairs are implemented and communicated to the subscriber terminal unit TAE for establishing a connection via the signaling channel ZGK.

Will the realization of a connection via the broadband network VBN determined by appropriate signaling, then a first narrow band telephone connection with the subscriber A is prepared.

In addition, a compound subscriber A to subscriber terminal unit TAE constructed over the narrowband / broadband connection computer SB / BB-C via the broadband switching array BB-V, so that if to agree, both parties to a broadband connection, by operating entsprechnder buttons on the broadband terminal BB-E1 , this is claimed. This results in a picture, sound and data through connection via the broadband network.

Solves one of the participants, the corresponding trigger character is either passed over the telephone PBX system, implemented by the signaling conversion module to the broadband network VBN or reversed accordingly via the subscriber terminal unit TAE, again converted by the matching module, sent to the telephone private branch exchange and a narrow band and is controlled via the connection computer SB / BB-C triggered broadband.

In the event of an incoming assignment, ie A-subscriber via the VBN wishes B subscriber of the broadband PBX BB-PABX, the incoming connection request is sent over the signaling channel ZGK and be registered in the matching module VBNA. Then, a corresponding reaction in which controlled by the computer unit, the multi-frequency code receiver / transmitter is now set in the mode "Send" and the dialing information corresponding multifrequency tone pairs are sent. The telephone PBX SB-PABX switches the desired compound, so that the B-subscriber is called.

If the B-subscriber answers the narrow band telephone connection is restored first and if a broadband connection is desired is done, then after that described immediately in a manner analogous to the outgoing call, a circuit through a broadband connection. Analog is also a release of the connection.

In addition to Mehrfrequenztonsignalisierung also announcements for voice-controlled user interface of broadband terminals subscriber can take place. These can be read from the speech memory and displayed to the subscriber as announcements such as "dial tone", "dedicated connection", "Error" or "wrong number".

Thus, the broadband terminals participant receives in a simple cost-effective manner, without any changes are required in the telephone PBX, clear and comprehensible information. This represents a significant simplification of the operation of a public broadband network connection, without each participant a separate operator station should be assigned.

Furthermore, the broadband terminals are broadband PBX invention BB-PABX all features of the telephone private branch exchange SB-PABX available (eg conference, consultation), since these features through the narrowband connection are introduced in a simple manner and then only have the broadband connection, as described, must be activated ,

The broadband PBX invention is in no way limited only to the specified in the above embodiment, signaling as it can implement by simple programming of the signaling conversion module any type of signaling to eg use the optionally provided connections to ISDN or to 2 Mbit / s network can.