DE2941263A1 - PBX extension telephone set - has one key for selecting several connection functions including optional appliance remote start and stop circuit - Google Patents

Abstract

A relatively slow but inexpensive selection circuit for a p.b.x. connects an exchange line to any p.b.x. line and enables any p.b.x. to select and communicate with a selected other p.b.x. or enables an external calling subscriber over an exchange line to set up, by remote control, one of several electric circuit switches e.g. to switch on or off a heating system, air conditioning system, etc. In the first case, an external call causes all extension bells to ring. If the answering station happens to be other than the desired one, the attendant presses a key which sets a bistable enabling a clock signal generator and a ring counter. The latter presents its binary output to the addressing circuit. When the right address appears, the key is pushed once more which resets the bistable and stops the counts. The barrier circuit is restored and the external line connection connects to the desired extension.

Description

description

The invention relates to a device for triggering functions within a telephone network by means of a telephone set, in particular for triggering ringing signals on telephones in a private branch exchange.

In the case of dial-up systems, they are used to control functions within a telephone network - in particular to establish a connection - necessary Signals emitted via dialing pulses or other buttons such as the earth button, except there are no additional connections on the line to transfer the call. If the connection is being established within the system, for example for relaying and for queries made via the rotary dial or the keypad is for A dial-up receiver is required for decoding the function control signals. One of those Dialing receivers could be relatively inexpensive with the previously used pulse dialing method will be realized.

When using the multi-frequency method (DTMF), however, is a more complex one Construction required, which is a significant cost component in smaller systems would matter. But also with smaller systems (series systems1 where the Switching takes place via keys, which are the individual devices in the private branch exchange are assigned, is due to the number of keys and the required per set The required consultation rate requires a relatively large amount of effort.

This also applies to smaller private branch exchanges suitable for private households to meet the need for queries and transfer calls, a conception is required in which as few simple assemblies as possible are used will. In addition, it is desirable to trigger additional functions via telephone sets (if necessary also externally) is possible. So can with in-house telephone systems for example, arranged on a telephone set actuating elements in Connection with a door intercom system included in the private branch exchange a door opener can also be controlled.

The invention specified in claim 1 is based on the object to specify a device of the type mentioned above, which makes it possible to use Operating means associated with a telephone set remotely controlled functions - In particular switching functions - to be triggered without being in the case of the switching functions this would require an optional recipient or additional consultation records. The device should also be able to be produced with little component effort.

It is particularly advantageous in the solution according to the invention that the assemblies required for triggering functions in conventional telephones can be integrated. Changes to prefabricated, high-volume, and therefore assemblies that are inexpensive to manufacture, such as the keypad would have to be carried out in the case of apparatuses working according to the multi-frequency method, are not necessary Consequently.

Advantageous further developments of the invention, which are also in the subclaims are specified using the in the embodiment shown in the figures described in more detail below. The figures show: FIG. 1 the overall circuit of a circuit according to the invention Device containing simple private branch exchange in a schematic representation and FIG. 2 shows an additional arrangement which is advantageously used in the individual Telephone sets for ease of use is provided.

In the embodiment shown in Fig. 1 are within a private branch exchange, three telephones 1 to 3 for calls via one Trunk 4 provided.

Since the telephones 1 to 3 also have an internal part 4 ' the line 4 can be connected without an exchange connection being established Calls within the private branch exchange possible. In the illustrated embodiment it is an in-house telephone system in which the call frequency is low value is placed on the least possible effort. (The one used to establish the exchange connection by closing the exchange loop and connecting the individual telephones 1 to 3 with the line part 4 'necessary components and function controls are not shown in the illustration according to FIG. 1, they are however, measures familiar to those skilled in the art.) The dashed Continuation of L.eitung 4 'to the right in the figure indicates that further Extension sets can be connected. It can also be in the framework an in-house telephone system can be a door intercom.

The function control in a separate from the telephone sets components to be arranged, which belong to the control part of the private branch exchange, are summarized in a block 5, which is bordered by dash-dotted lines.

For the sake of clarity, that part of the described device, which is used to mediate between the individual apparatus 1 to 3 is required. The representation should be based on the process for an incoming call.

If an outside call is received, this is indicated by a telephone ringing (main unit function) or all connected devices are displayed. The one of the apparatuses 1 to 3, the is picked up is connected directly to the exchange to answer the call.

Often times it will happen that not the person who picked up the weight first has, is required, but another that is close to one of the others Telephone, but was not the first to pick up the handset. A referral of the incoming call now proceeds as follows: The subscriber, who answered the call, but found that the call was not was intended for him, presses the earth key, which when the connection is established In the illustrated embodiment, the function of a call button or call forwarding button takes over.

The signal generated by pressing the earth button is sent to an OR gate 6 and from the output of this OR gate to the set input s one Flip-flops 7. The set flip-flop 7 generates a clock via its output 8 activated, which cyclically emits a pulse train at a speed which can be easily followed by an operator by counting, so that by the operator in response to a signal within the normal response time an operation can be carried out before the next signal appears. The number the signals to be emitted by the clock within a sequence corresponds to Number of telephones connected to the private branch exchange. The clock 8 repeats these pulse trains cyclically, with each successive pulse train a break of a duration is provided which differs from the duration of the between The pauses provided for the impulses, which enable counting, are clearly differentiated.

The pulses appearing at the output of the clock generator 8 arrive at a signal generator 9 through which audio-frequency signals for the duration of the pulses be generated. These audio-frequency signals arrive via a switch 10 Line part 4 ', with which the devices of the private branch exchange can be connected. This part is separated from the outgoing exchange line 4 by a lock 11, which prevents the audio-frequency signals 10 from reaching the public network. Such a lock can be implemented, for example, by a switch, which disconnects the private branch exchange from the exchange line when the clock generates 8 pulses be handed in, whereby self- be taken care of at all times must maintain the connection to an external participant during this time remain.

The subscriber who answered the call can now hear the Sequence of sound-frequency impulses in such a way in the earpiece that he can count and actuated when he has reached the number that corresponds to the digit that corresponds to the one The set is assigned to which the incoming call is to be transferred, the earth key again. Since the impulses are emitted cyclically, it is meaningless if the person who answered the call misses the first pass, to press the earth button in good time. After the programmed longer break the impulses are emitted again and the counting process can start again at one to be started.

If the earth button is pressed a second time, it comes from this output signal via the OR gate 6 in turn to the one already set Flip-flop 7, which then does not change its state, and to an AND gate 12, and since its other input is connected to the output of flip-flop 7, to a component 13, which takes over addressing and switch functions, which are to be explained in more detail below. The component 13 determines which The (switching) function can be initiated by pressing the earth button a second time, i.e. it prepares the function to be triggered. In the present example there is this is that a call is triggered on one of the other devices 1 to 3.

The component 13 is controlled by a ring counter 14, which increasing the count by "1" Clock pulses from the output of the clock 8 receives. The maximum count corresponds to the number of pulses one episode. When the maximum count is reached, the ring counter 14 comes back in its initial position. The ring counter sends the counter reading in binary code to the Component 13 further, which depends on the operating mode described here from the binary coded counter reading one of its to one of the devices 1 to 3 (and if necessary, outputs leading to other apparatuses are addressed. With it got the pulse appearing from the AND gate 12, which is caused by the actuation of the The earth button of the set on which the call was accepted was triggered, to one of the other telephones and triggers a ringing signal there. The outgoing ring signals also appears at one input of an OR gate 15, which is the flip-flop 7, the clock generator 8 and the ring counter 14 resets to an initial state, wherein by resetting the flip-flop 7, the clock generator 8 is switched to inactive and does not emit any more impulses.

The clock 8 and the ring counter 14 enter a state that ensures that with a renewed activation always with the beginning of the pulse train is started, i.e. in the case of the clock generator 8 that with cyclical delivery of the pulse train a longer pause only appears when the number of impulses has been delivered and for the Ring counter 14 that after the first pulse of the clock 8 of the device of the private branch exchange is addressed to which the number "1" is assigned.

The process of relaying is completed in that the now called subscriber of the extension location decreases and from the participant who answered first about the existence of one for him specific conversation is informed. After the first named participant his Has declared willingness to take over the conversation, the participant who Conversation has initially accepted, which means additional - not shown - Means the lock 11 is lifted and the connection to the calling subscriber is established will. Should turn out to be the person for whom the incoming call is determined, is not at the device to which the first transferred the first subscriber or the one called within the extension can be used Subscribers forward the outside call to a third set by again the earth button is pressed and the process running in the switching function is triggered will. The device according to the invention also makes it possible for participants to call selected for a call within the private branch exchange or also transfer an outgoing call to another subscriber.

The circuit shown is the schematic shown Representation realized through components as they are in the form of complex integrated Logic circuits available on the market or by interconnecting several such Components are realizable. In a corresponding way, a solution is programmed by means of Logic circuits possible, with the functions described of the components shown are to be included in a program sequence, which in the corresponding a microprocessor containing circuit to the input signals shown out the necessary Output signals testifies. The OR gate 15 can be used in the above The illustrated mode of operation of the circuit is omitted, it only has to be ensured be that after the delivery of a pulse from the AND gate 12 to the component 13 a reset of the flip-flop 7, the clock generator 8 and the ring counter 14 takes place.

The circuit according to the invention advantageously enables in addition to generating selected calls, there are also additional functions outside of it of the telephone network, which is particularly useful for controlling in one House or building maintenance installed devices can be useful. In an easy way can first of all control the function of a door intercom system through the shown device are adopted. Such a door intercom is just like another subscriber set connected to the private branch exchange If this does not generate a call signal by pressing the earth button a second time, but without further ado a connection is established, as is the case with picking up the phone corresponds to a corresponding telephone set. After the doorbell rings it is therefore sufficient that the The handset is picked up and the earth button is pressed. By pressing the Earth key after a given pulse of the pulse train is the connection to Door intercom is established and the incoming person can be contacted will. Appropriately, a further pulse of the pulse train is the actuation assigned to the door opener, whereby the door opener is controlled by a signal, which is output by the component 13 when the corresponding output is addressed is.

The further components shown in FIG. 1 are advantageous Possibility given by means of the switch within the control part (block 5) between the devices of the components already present in private branch exchanges and some additional circuits remotely controlled from outside the PBX Trigger functions in devices that are electrically connected to the control section (block 5) are.

In this way, for example, the owner of the private branch exchange of switch active or inactive outside monitoring circuits or a heating system put into operation so that warming has already occurred when after some Time arrives at his house. The possible applications are only limited here that the envisaged functions must be triggered by electrical signals.

In order to remotely control such a function, the private branch exchange like an answering machine function to be able to operate independently from the outside To answer incoming calls, for example, that a predetermined message text is delivered. The function of the actuating element (earth button of the connected Extension units) is activated by an external signal generator in this mode of operation taken over, which emits a tone-frequency signal on the line, which through Decoding means is recognized. In the illustrated embodiment, this is the case a filter circuit 16 is provided, which is only for the signal under consideration is permeable. The filter circuit 16 is followed by a pulse shaper circuit 17, whose output with a further input gear of the OR gate 6 connected is. The external signaling means can consist of a portable transmitter, the caller to trigger the function near the mouthpiece of the person Device from which the call was made and the function triggered externally shall be. Another possibility is that this signal transmitter device with another telephone set (for example in a weekend house) is built in and the corresponding signals can be issued at the push of a button. A first signaling corresponds to the first actuation of the earth button, whereupon via the flip-flop 7 of the clock 8 in the manner already described in action is set and the signal generator 9 emits sound-frequency pulses. In contrast to the mode of operation described above, the pulse shaper comes from the output 17 a signal to the switch 10, whereby this switched to its other position so that the signals emitted by the signal generator reach the trunk line 4 and become audible for the caller. This can now by pressing again of his signal generator after that impulse of the Signalfola, that of the desired one Function is assigned, via the ring counter 14 and the component 13, a switching pulse trigger that enables the function to be performed. (The mode of operation corresponds to that of the second actuation of the earth key.) Because but the pulse from the output of the pulse shaper 17 also to another input of component 13 arrives, it receives additional addressing information, whereby an output pulse does not go to one of the devices 1 to 3 but to one downstream shift register 18 arrives.

In itself there would be the possibility of using the other outputs of the Component 13 directly one of the functions to be executed F1 to F3 symbolizing Control blocks 19 to 21. But to secure against unauthorized access achieve, a function is only executed when a sequence of encoded Correctly transmitted. The caller who wants to trigger the function has successively several times within the signal sequence, each time after a pulse in trigger a signal at the specified position, whereupon it is sent to the input of the shift register 18 a corresponding signal arrives and a switch is made via the clock input is effected. When the information written in the shift register of those which is preset in a decoder 22 connected as a comparator the function corresponding to the transmitted code is triggered. Is this If the shift register is full, a signal is sent from a corresponding output to the OR gate 15, whereby the circuit is set in an output state and the shift register 18 is also reset. This ensures that there is no more information in the shift register when a new call is made. (It is favorable that if a shift register 18 for the evaluation of a more extensive to be transmitted information is provided, the component 13 only as a switch acts when a signal appears at its input connected to the pulse shaper 17, since the shift register can hold more information if it is with a binary Information is fed as if only on one of several input lines a signal is present.) In Fig. 2 is an ease of use shown for the device from which a (switching) function was triggered shall be. To save counting the signals within the sequence, there is one optical display provided, which synchronizes with the incoming audio-frequency signal pulses is switched on. This can be a numeric display or - as shown - act around a running light display 23, the individual light elements with the assigned functions or with identifications (A to E) for those Apparatuses are provided which can be called from the apparatus. The running light display 23 is controlled by a second ring counter 24 whose counting capacity with the Ring counter 14 in FIG. 1 corresponds. The ring counter 24 is via a flip-flop 26 by first pressing the earth button (ET), switched on, whereupon the over the line 4 incoming signals generated by the signal generator 9 (FIG. 1) Cause switching. (None of the elements of the running light display are in the initial state illuminated.) The ones coming from the line 4 to the ring counter 24 via the flip-flop 26 Clock signals are passed through a filter or

Pulse shaping circuit 25 processed. By pressing it a second time the earth key, the ring counter 24 is switched to inactive and into an initial state reset. The ring counter 24 is switched on and off synchronously to the counter 14.

The selectivity of the circuit 25 need only be low if the apparatus equipped with the device according to FIG. 2 within a telephone private branch exchange is arranged, because when the ring counter is activated, in the end the control pulses are present on the line and only these to the input of the circuit 25 can reach. The auxiliary circuit according to FIG. 2 can thus also be converted into Easily realize through integrated components, with complex filters for multiple frequencies and circuits that sequentially transmitted the Differentiate between frequency mixes in time, as in the case of the multi-frequency method working election recipients would be required.

Further embodiments can be used depending on the desired application be cheap. So the running light display can be represented by a number or symbol display Replace if the character appearing is such that it is convenient for the user it is possible to select this immediately from an apparatus of the private branch exchange or one Assign function.

Instead of pressing the earth key twice, one Another advantageous embodiment of the invention, the signal only follow and issued as long as the actuation of the earth button continues. When letting go of the same becomes the function "designated" at this point in time by the previously appearing impulse executed and then reset the counters involved. With that, the Flip-flops 7 and 26 are omitted.

The longer one provided between successive pulse arcs Pause can preferably be generated by the fact that, after the impulse sequence has been delivered, if the ring counter has reached its initial state, the clock generator 8 continues to work tet, but a pulse on the line leading to the signal generator 9 is suppressed, so that no audio-frequency signal assigned to an executable function is emitted or a corresponding visual display is triggered, but a corresponding one increased pause arises. The counter reading corresponding to the pulse to be suppressed the ring counter 14 or 24 forms its rest position, the none to be triggered Function is assigned.

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Claims (13)

Device for triggering functions within a telephone network. Claims t1. Device for triggering functions within a telephone network by means of a telephone set, in particular for triggering of ringing signals on telephones in a private branch exchange e t through first actuating means, which means (8, 9) for generating activate a sequence of signals appearing one after the other, which are used for the user of that telephone set (1, 2 or 3) over which a function is to be triggered, are individually perceptible, controlled by a counter (14) Switching means (13) which are synchronized with the signals appearing one after the other prepare the triggering of one of several different functions and second actuation means via which the prepared at the time of actuation Function can be released for execution. 2. Apparatus according to claim 1, d a d u r c h g e -k e n n z e i c That is, the signals generated are the same among themselves and for the operator are countable. 3. Device according to one of the preceding claims, d a d u r c it is noted that the means (8,9) for generating a sequence of Signals appearing one after the other are designed in such a way that in cyclical Continuous repetition of such sequences with a pause between each other appearing episodes are released, whereby the pause is noticeably greater than the pauses between individual signals. 4. Device according to one of the preceding claims, d a d u r c it should be noted that the first and second actuating means by a single actuating element (earth button ET) can be formed, with the function the first actuation means by a first or the beginning of the actuation and that of the second actuation means by a second or the end of the actuation of the actuating element is caused. 5. Device according to one of the preceding claims, d a d u r c h 9 e k e n n n z e i c h n e t that the signals as audio-frequency signals over the Earpiece of the telephone set (1 to 3) are noticeable. 6. Device according to one of the preceding claims, d a d u r c it should be noted that the means for the visual display of the signals are attached the telephone set are provided. 7. Apparatus according to claim 6, d a d u r c h 9 e -k e n n z e i c h n e t that the means for visual display controlled by the signals synchronously different with the signals of the signal sequence appearing one after the other Display signal states cyclically. 8. Apparatus according to claim 7, d a d u r c h g e -k e n n z e i c h n e t that the means for visual display consist of a numeric or character display exist. 9. Apparatus according to claim 7, d a d u r c h g e -k e n n z e i c h n e t that the means for visual display (23) consist of a running light display. 10. Device according to one of the preceding claims, d a d u r c h g e k e n n n z e i c h n e t that for forwarding an incoming call Within a private branch exchange, the switching means are designed such that as different functions one after the other the triggering of a call signal at the individual telephone sets (1 to 3) of the private branch exchange is being prepared. 11. The device according to claim 10, d a d.u r c h g e -k e n n z e i c h n e t that the earth button (ET) serves as an actuating means. 12. Device according to one of the preceding claims, d a d u r c h g e k e n n z e 1 c h n e t that for the remote-controlled triggering of functions Means (16, 17) for detecting a triggered by a remote actuating means, signal transmitted over the line to the called telephone set the appearance of the signal after pressing the first resp. of the second actuating means corresponds. 13. The apparatus of claim 12, d a d u r c h g e -k e n n z e i c h n e t that control means (18, 22) are provided which The storage of several signal states according to the type of functions to be triggered one after the other, with the actual selected function only then being used Execution is enabled when the sequence of signal states is a given Pattern matches.