DE3315884A1 - Method and circuit arrangement for operating a centrally controlled telecommunication, particularly telephone, switching system - Google Patents

Abstract

A subscriber which dials a subscriber connection which is currently busy because of a data connection (for example videotext) receives an announcement which informs him of the type of busy case. Dialling suffix dialling codes triggers the sending out of a particular information item by a signalling circuit looped into the data connection which results in a visual indication on the screen of the calling subscriber. If the called subscriber releases the data connection on the basis of this indication, a telephone connection is established between him and the calling subscriber. The indication on the screen can also contain the name or the telephone number of the calling subscriber.

Description

Method and circuit arrangement for operating a

centrally controlled telecommunications, in particular telephone switching system The invention relates to a method and a circuit arrangement for operation a centrally controlled telecommunication system, in particular a telephone exchange, at which subscriber lines either with the respective subscriber station and the switching system or with a data station and via a connection line can be connected to a data center (e.g. screen text center), a caller of such a subscriber line during a connection receives the busy signal from the switching system with the data center.

The subscriber line, each of which is a telephone subscriber station connects to the telephone exchange can also be used for data transmission , for example as part of the video text service.

The telephone subscriber station is used on the subscriber side for this purpose separated from the subscriber line and the latter connected to a modem. On the switching side, the subscriber line is from the double network the switching system and either directly or via another modem connected to a data exchange, via which a connection to the screen text center can be produced. Is the on-screen text headquarters directly at the If the switching system is connected, then the outputs of the screen text center are already provided with modems, which means there is no need to switch over on the exchange side.

Is such a participant connection with a screen text center connected, he is not available for callers. As the subscriber station is disconnected from the subscriber line, there is also no possibility of notify the called party of the presence of a call, such as this for example in the case of a line occupied by a telephone connection Feeding in a special audible tone (call waiting) is possible. It's already suggested been (P 32 38 087.9), the subscriber line through appropriate carrier frequency devices simultaneously usable for both telephone and data connections. In such a case, there is no busy case during a data transmission.

The object of the invention is now to provide a method and a Specify circuit arrangement, whereby in an alternatively usable subscriber line the possibility is given to a subscriber whose subscriber line is busy by a data transmission to indicate the presence of a call.

This object is achieved in that the calling subscriber line with a call to a subscriber line connected to the data center an announcement device is connected, which notifies this, for whatever reason the desired subscriber line is busy that by one in the relevant Connection line looped-in reporting record corresponding to the called subscriber line Data signals are transmitted, which at the data station by an optical Point out the display of the call in progress.

The caller receives the message instead of the busy tone G w ensure that the desired subscriber line is busy because of a data transfer is and that the desired subscriber is aware of the presence of a call is made. The presence of the call can be shown, for example, on the screen of the Data station are displayed.

A further development of the invention is that the reference to on the screen in a special line. This can be the bottom one, for example Screen line that is reserved for system messages (IT reports, published by W. Brauer on behalf of the Gesellschaft für Informatik (22), communication in distributed systems, Springer-Verlag, Berlin, Heidelberg, New Kork, 1979, page 204).

Further advantages result from the subclaims.

The invention is explained in more detail using an exemplary embodiment, which is shown in the drawing.

1 shows the block diagram of a telephone exchange and FIG. 2 shows the block diagram of a message record.

In the block diagram of a telephone exchange shown in FIG For example, it can be one with analogue switching through of the speech paths Act. However, the application of the invention is not limited to such a system but also applicable to systems with time-mutliplexer connection.

The block diagram of the telephone exchange contains only those Devices that are absolutely necessary for an understanding of the invention. In the Incidentally, the telephone exchange can be a public telephone exchange or a private branch exchange. The structure and the mode of operation a telephone exchange is, for example, in the publication TN-Nachrichten, Issue 76 (1975) on pages 7 ff and issue 79 (1978) on pages 8th ff described. With regard to the screen text service, reference is also made to the printed matter TN-Nachrichten Heft 85 (1982) pages 31 to 37 referenced.

Telephone subscriber stations TA, TB are via subscriber lines TAL and subscriber line circuits TSA, TSB connected to the coupling device KN. Connection lines DVL are via individual line circuits LS with the coupling network KN connected. In addition, there are connections between those controlling the switching network KN central control devices ZST and the subscriber line circuits TS and the Line circuits LS.

At the subscriber line circuit TSA is via the subscriber line TAL a switching device U connected, which an optional connection of the Subscriber line TAL with a telephone subscriber station TA or with a modem M allows. A data station DS is on the modem, for example a television set and an operating device connected. The subscriber line is thus prepared for the use of the screen text service.

The connecting lines DVL1 and DVL2 lead to a video text center BTZ. A DMS message record is looped into the connection line DVL, which is connected to the central control device ZST. Another connection option of the reporting record DMS is indicated in the dashed arrangement, the same can be looped into a connection through the coupling network KN. Furthermore, there is a double field KN connected an announcement device ANS, whose announcement texts by the central Control device ZST are selectable.

It is now assumed that a connection from the subscriber line TA to the screen text center BTZ is to be set up. Through the switching device U is to be indicated symbolically that for this purpose the subscriber line TAL is connected to the modem M. The switching device U can either be an independent one Facility be, or also form part of the subscriber station or the modem. By manually or automatically triggering the transmission of a screen text service The connection establishment is initiated with the identifying number. The election numbers the call number can now either in the subscriber line circuit TSA or also recorded by a not shown election recording device and the central Control device ZST are communicated, which then establishes a connection between a free connection line DVL and the subscriber line circuit TSA within of the switching network RN and initiates the switching in the switching network KN. This establishes the connection with the BTZ screen text center. By typing further dial numbers can now be communicated to the central BTZ on-screen text, which screen text provider should be used. In the further description it is assumed that the subscriber line TA via the connecting line DVL2 is connected to the screen text center BTZ. From the screen text center BTZ now receives the subscriber line information that is modulated by a modem M. Via the connecting line DVL2, the switching network KN, the subscriber line TAL is transmitted and demodulated by the modem M on the subscriber's side. the Information transmission in the direction described takes place in blocks, whereby each block contains the information for a so-called "screen text page. In the data station DS, this information is stored in a video text decoder stored, whichever is the same for display on the screen processed. The retrieval of information from the subscriber line takes place in the opposite direction to the BTZ screen text center.

If a call is now made to the subscriber line TA either via a telephone connection line not shown or, for example, from the subscriber station TB, the calling subscriber normally receives the busy tone independently whether the desired subscriber line is now because of a telephone connection or because of a teletext connection is busy. He knows desired participants have the appropriate authorization, i.e. only a part or also all subscriber lines that use the teletext service are prepared, are ready for the optical call waiting "according to the invention, so the calling subscriber line or diématem calling subscriber is connected Connection line at the request of the central control device ZST via the Coupling field KN connected to an announcement device ANS.

During the free / busy test in the central control device ZST it is determined that the desired subscriber line is based on the selected Call number is connected to the screen text center BTZ and whether the relevant Subscriber connection has a corresponding authorization. Is that the case, so instead of the connection with a sentence to transmit the busy tone a connection with the announcement device ANS.

The calling subscriber receives an announcement which informs him that the desired subscriber is currently using the teletext service and if the calling party wants the called party to be aware of the presence of a call is made aware of this by dialing a specific code is to be marked. The suffix is either sent by one to the connection in question switched on, not shown election acceptance rate or by a corresponding Elective recording device take place in the announcement device ANS. The selected code number reaches the central control device ZST, wc ~ Ulfse looping in the reporting record DMS (dashed line) through the switching network KN into the connection with the Screen text initiates the central BTZ The DMS message record sends at the instigation of central control device ZST a corresponding information to the subscriber line of the desired subscriber, where they are in the data station DS on the screen triggers a corresponding display.

This advertisement can, for example, in a special, reserved Line on the screen. With the help of this display, the participant made aware of the presence of a call.

With the beginning of the transmission of the information from the reporting record DMS begins a time limit to expire, within the duration of which a corresponding signal of the data station DS must arrive. The called subscriber can now either state that he wants to call back, thereupon the calling subscriber receives based on the evaluation of the signal in the central control device ZST from the announcement device ANS a corresponding announcement, whereupon this releases the connection. Run the specified time without a signal from the called subscriber in the DMS message record arrives, the calling subscriber receives an announcement from the announcement device ANS, which reports that the called subscriber does not respond to the display. The same announcement is sent out when the called subscriber is within calls up a new page within the specified time.

In these cases, instead of further announcements, the called subscriber the busy signal can also be communicated.

The called subscriber resolves based on the display on the screen the connection with the screen text center BTZ within the given time off, its telephone subscriber station TA is initiated by the central Control device ZST connected to the calling subscriber via the coupling field KN, so that there is a normal telephone connection between the two.

With different codes, which are provided by the calling subscriber different display information can be entered in the DMS message record triggered for the called subscriber.

As already mentioned, the calling subscriber is gift a post-dialing information prompted by the announcement. For entering the suffix a period is specified after which the calling subscriber gives the busy signal received if a by-election has not taken place. The connection could be charged be treated in such a way that the connection is closed until the beginning of the period for the by-election is free of charge because the called subscriber is only sent a message through suffix dialing is transmitted.

The period after the by-election can now either be given to the calling subscriber or the called subscriber will be billed, including a Flat-rate compensation within the framework of the higher basic fee for the special authorization is conceivable.

So far it had been assumed that for the implementation of the so-called optical AnklopSens "a free reporting record DMS in the connection with the screen text center BTZ is displayed. However, it is also another Solution conceivable in which the DMS reporting record is already firmly in a connecting line looped in, as shown for the connection line DVL1.

The switching process already described in the switching network KN could the case occur that a data transmission between the screen text center BTZ and the subscriber line is mutilated. This is done with a fixed assignment of a DMS reporting record to a DVL connection line avoided. With such a Arrangement takes place the connection of a subscriber line for the teletext service with such a connecting line DVL, if the relevant subscriber line has the appropriate authorization for optical call waiting ". Other subscriber lines Without this authorization, a DVL connection line without a DMS tied together.

For control reasons, the announcement device ANS and the voting device, not shown, is also part of the reporting record Be DMS. Further details on the structure of the DMS reporting record will be available based of the block diagram in Fig. 2 explained in more detail.

The connection line DVL is connected to the reporting record, which is performed via the switches S1 and S2 to the switching network KN. Another connection with the switching network KN is used to connect the announcement device ANS and the dial recording device WE. In the illustrated rest position of the two switches S1 and S2, the connecting line is DVL looped through the DMS message record while the switch is in the other position S1 and S2 are a data receiving device DEM and a data sending device DES, respectively can be connected to the connecting line DVL. With the data transmission device switched on DES can use the switch S3 to control the data receiving device DEM in parallel with the same be switched on. The switches S1 to S3 can also be used as electronic switching devices be designed, they are in each case by the control device ST of the reporting record DMS actuated. The data receiving device DEM takes the data on the connection line DVL occurring information and forwards them to the memory SP, which the capacity for the information of an entire block, which is a screen text page corresponds to. Incoming signals from the subscriber are received by the data receiving device DEM passed on to the control device ST. The data sending facility is DES on the one hand with the memory SP for sending the memory contents of the same in the direction Subscriber connection and on the other hand with the control device ST for transmission the particular one on the subscriber line of the called subscriber on the screen to be displayed, information indicating the presence of a call connected. The selection of the announcement texts is made by the control device ST, either on the basis of the post-dial codes received from the election recording device WE or on the basis of information from the central control device ZST.

For sending information to the called subscriber line to display a corresponding note on its screen, the Switches S1 and S2 actuated. The data transmission device DES sends the speaking Information to the subscriber line, at the same time is the data receiving device DEM connected to the connection line DVL, thus when a data block occurs during the transmission of the information to the called party the same in the Memory SP can be cached. This way it becomes a mutilation the transmission of information from the screen text center BTZ to the subscriber line Avoided during the transmission of the indication of the presence of a call. To The information is then sent to the called subscriber line the content of the memory SP, i.e. the data block received by the data sending device DES sent to the called subscriber line.

After sending the information about the waiting call to the called Subscriber, the switch 53 is closed and thus the data receiving device DEM connected. Incoming signals from the subscriber line are transmitted by the same recorded and passed on to the control device ST, where they can be selected of announcement texts for the announcement device ANS.

The release of the connection with the screen text center is either in the line set LS of the relevant connecting line DVL or in the reporting set DMS recognized and passed on to the central control device ZST, which does the separation the connection in the switching network KN caused.

In addition to an on-screen indication of the presence of a call the display of the caller's number or name is also conceivable.

Claims (18)

Method and circuit arrangement for operating a centrally controlled Telecommunication, in particular telephone switching system Patent claims, method to operate a centrally controlled telecommunications system, in particular a telephone exchange, at which subscriber lines either with the respective subscriber station and the switching system or with a data station and via a connection line can be connected to a data center (e.g. screen text center), a caller to such a subscriber line during a connection with the data center receives the busy part from the switching arlage, thereby characterized in that the calling subscriber line with a call to a the data center connected subscriber line with an announcement device (ANS) is connected, which informs this of the reason for the desired subscriber connection is occupied that looped into the relevant connection line by a Message record (DMS) transmitted the corresponding data signals to the called subscriber line which at the data station (DS) by a visual display on the present Notify call. 2. The method according to claim 1, characterized in that the reference the presence of a call is displayed on the workstation screen. 3. The method according to any one of claims 1 or 2, characterized in that that the message appears on the screen in a special line. 4. The method according to any one of claims 1 to 3, characterized in that that the calling subscriber line is connected to the called subscriber line is, if within a predetermined time the called subscriber line the Data connection triggers. 5. The method according to any one of claims 1 to 4, characterized in that that the calling subscriber line gives the busy signal or a corresponding announcement receives if the called subscriber receives further data within the specified time from the data center (DZ). 6. The method according to any one of claims 1 to 5, characterized in that that the calling subscriber line receives the busy signal if until the expiry of the given time, no agreed data signal is sent out by the data station (DS) will. 7. The method according to any one of claims 1 to 6, characterized in that that the call number of the calling subscriber is displayed on the data station (DS). 8. The method according to any one of claims 1 to 7, characterized in that that the name of the calling subscriber is displayed on the data station (DS). 9. The method according to any one of claims 1 to 8, characterized in that that by different signals sent out by the data station the transmission different announcement texts can be controlled by the announcement device (ANS). 10. The method according to any one of claims 1 to 9, characterized in, that the caller is prompted for suffix dialing by an announcement text, and that different Post-dialing digits different messages through the message record (DMS) to the data station (DS) are sent out. 11. The method according to claim 10, characterized in that the calling party Subscriber line receives the busy signal if within a specified Time no post-election digits arrive from this. 12. The method according to any one of claims 10 or 11, characterized in that that the specified period for the calling subscriber line is free of charge. 13. Circuit arrangement for performing the method according to the claims 1 to 12, characterized in that the reporting record (DMS) as well as all others peripheral devices of the switching system with the central control device (ZST) is connected. 14. Circuit arrangement according to one of claims 1 to 13, characterized marked that the reporting record (DMS) as required in the connection with the data center (BTZ) can be looped in. 15. Circuit arrangement according to one of claims 1 to 13, characterized marked that authorized subscriber connections with the data central (BTZ) are connected via connecting lines (DVL), which are individual Have reporting record (DMS). 16. Circuit arrangement according to one of claims 1 to 15, characterized characterized in that the reporting record (DMS) has a data transmission device (DSE), a data reception device (DEM) and a memory with a capacity for the information of a screen text page having, the data transmission device (DSE) and the data reception device (DEM) with the memory (SP) can be connected. 17. Circuit arrangement according to one of claims 1 to 16, characterized marked that the announcement device (ANS) is part of the message record (DMS) is. 18. Circuit arrangement according to one of claims 1 to 17, characterized characterized in that the reporting record (DMS) is an election receiver (WE) for receiving the Having by-election.