DE3436595A1 - Telephone PBX system - Google Patents

Abstract

Telephone PBX system with at least one subscriber line circuit to connect in each case one terminal device, in particular a telephone set, to means for emitting control signals in the form of dialling signals via the speech wires and with at least one subscriber line circuit to connect a terminal device to means for exchanging control signals with the terminal device via at least one additional signal line, both types of subscriber line circuit being combined in one subscriber line circuit in each case for one connected terminal device, the type of signal transmission between the terminal device and the system being definable for each subscriber line circuit individually by means of an additional switching device either in the form of dialling signals via the speech wires or via the additional signal line.

Description

description

The invention relates to a private branch exchange as described in the preamble of claim 1 specified Art.

There are telephone private branch exchanges of the type specified at the beginning known, in which terminals of different types are connected at the same time can.

These are so-called "series systems", which for example in connection with external extensions the connection of conventional telephones allow via a two-core cable.

Special devices are connected directly to the series system, where, in addition to a keypad, an additional keypad for triggering Special functions and a display for status indications is provided. With such "Series systems" are the lines of the connected devices according to the state of the Technology also led centrally to the switching device, with additional to the speech cores further cores are provided, which as signal lines to Transmission of signal and status information and for power supply. To connect a normal speech set, such a series system must have a additional matching circuit can be added, which the signals of the additional Data lines transmitted from the connected device via the speech wires themselves Derives dial signals. In doing so, however, the connected normal apparatus only a limited selection of Functions of the row system steer. If two or more normal telephones are to be connected, the appropriate one is required Adaptation circuit to be provided accordingly several times, making a relatively large constructive Effort is required. Such matching circuits are also necessary, for example, if special devices are to be provided for the devices which are in the Usually only to be installed in connection with normal devices, such as Second set connections, second extension systems etc, The in the characteristic Part of claim 1 specified invention is based on the object of a private branch exchange to create the type specified above, in which the connection of several devices each of different genera is possible without great effort.

It is particularly advantageous that at the individual subscriber lines Both types of telephone can be operated alternately in the private branch exchange, subsequent changes can also be carried out easily. Since all operating functions of the private branch exchange is usually only of importance for a few extensions can - especially less frequented - extension sets be designed as normal apparatus.

Due to internal changes in the associated program, depending on connected apparatus by means of a bistable element, in particular in one corresponding data register - the connected device type as data status signal and, depending on the status of this register, the data and Status transmission either via the speech lines or via the additional ones Data lines made.

In advantageous developments of the invention, the additional Signal lines of the subscriber circuits are cyclically switched to a common line and interrogated so that the appropriate data transmission and isolation circuits only have to be present once.

According to a further advantageous development of the invention based on a known private branch exchange with microprocessor control, which is supplemented by a plug-in unit that connects the additional signal lines undertakes data operations to be processed, this additional unit in turn direct Has access to the data bus of the central processor and on the output side with the additional Signal lines of those connection organges is connected to the special apparatus can be connected in series system technology. This type of wiring allows in the telephone private branch exchange according to the invention from a conventional dialing system to assume, which only has to be changed in their programming, what by the exchange of ROMs is possible without any problems. That way is an economic one Manufacturability guaranteed, with an extension also after the use the private branch exchange can be made at any time without it being a complete Exchange needs. Furthermore, there are also normal speech sets connected to them all or nearly all Functions of the system can be triggered, with only the status information by means of the additional device from the corresponding registers of the central processor and accordingly on the displays of the connected Special apparatus are transferred.

If, according to another preferred embodiment of the invention, the The signals corresponding to the earth key function are also in the form of digital signals are transmitted via the additional signal lines from the special equipment, so when replacing normal devices with special devices with display and additional control buttons, no changes in the line network are required, as the previous four-wire lines can continue to be used.

By design in the form of an additional device to a microprocessor-controlled Dial-up private branch exchange, it is possible in a preferred manner, the connection options to retrofit special devices with comfort functions and a display, with the The execution shown below almost all for the connection of the special devices necessary assemblies in the (in the housing of the private branch exchange as a circuit board add-on devices that can be added at a later date are available. This is then for everyone Extension organs at the same time give the additional connection option without that - as in the prior art - a conversion for each connecting element individually must be done.

Advantageous further developments of the invention are set out in the remaining subclaims marked or will be standing together with the description a preferred embodiment of the invention shown in more detail. The only figure shows a schematic diagram of the switching device according to the invention.

A control part 1 contains the CPU, the BUS, the ROMs and RAMs of a microprocessor-controlled dialing system of smaller expansion stage. A power supply part 2 is only indicated symbolically and represents the power requirement for all of the shown Assemblies safe. The control unit 1 communicates with an input / output module via a BUS 3 4, which, depending on the program control of module 1, controls a switching matrix 5, with the relay the connections between two trunk lines 6 and 7 and three Participant organs 8, 9 and 10 are switched. The switching states are dependent generated by pending signals on the trunk and subscriber lines, the Signals on the subscriber lines (dial tone etc.) queried via modules 11 and 12 and passed on. Corresponding modules 13, 14 and 15 are for the subscriber lines provided, whereby these are designed to be interactive, i.e. there is also a signaling instead of the program present in the control unit 1. The assemblies 13 to 15 record the typical ones in a dialing system on the subscriber lines transmitted control signals, such as dial characters and DC loop. The submitted Signals include the call signals and the signaling of acoustic identifiers for the participant. The actuation of the earth button is a signal state on the lines "E" is queried and sent directly to the input / output unit 4 guided. The assemblies shown so far correspond to a conventional dialing system, with various equipment features (night service, etc.) from the control unit program can be influenced and via a corresponding signal via the keypad of the connected subscriber sets can be activated.

The embodiment according to the invention of the system shown here contains a further control part 16. This generates signals which are on a separate data line are available for participant organs 8, 9 and 10. One with the control unit 16 connected second input / output unit 17 controls the data traffic the other line, which is marked with "DAT". Be on this line Data signals transmitted to a connected special apparatus 18, which status displays trigger in a display unit 19. Furthermore, the signals from the keypad 20 and from another control keypad 21 from the apparatus 18 via the unit 17 transmitted to the control unit 16.

In the control unit 16 there are internal registers (not shown) Signal states recorded, which indicate the type of the subscriber circuits 8, 9, 10 identify connected devices. For the subscriber circuit 9 this is Characteristic "special apparatus" recorded so that for this subscriber circuit over the line "Dat" identifying control signals to the system and the status of the system Signals are transmitted to the device. The line for the earth key "E" is not needed. If several special devices are connected, these are identified using the Input-output output unit 17 cyclically one after the other supplied with data.

The control unit 16 and certain (not shown in the drawing) Transmission facilities for participant organs therefore only need to be present once to be.

The power supply of the takes place by means of a further line SV " Apparatus 18, whereby this line can be linked to the data line to the extent that that on the two-wire line formed in this way, both the power supply and the Data transfer takes place. A separate processor is provided in the control unit 16, which depends on the signal states present in the control unit 1 carries out a parallel-serial conversion according to a corresponding interface. In another - not shown in detail here - embodiment of the invention the corresponding signals can also be generated by the central control unit 1 The microprocessor available there has the corresponding signal processing capacity having. In this case the input / output control unit 17 is directly connected interactively connected to the BUS 3.

A simple dialing device 19 is connected to the extension unit 8, which in addition to the speech wires "a, b" only has the earth connection E " the special apparatus 18 does not need the earth connection "E" to be led to the apparatus so that a two-pair line is also sufficient for connection. The earth key is operated in the special device 18 by means of a key on the keypad 21 triggered and transmitted as a data signal over the "DAT" line. It will also one Evaluation of the duration of the actuation made, with releasing the corresponding key, the delivery of the characterizing this actuation Data telegram is initiated. The transmitted data telegram is opposite to the Telegram transmitted to a simple actuation changes if the duration of the actuation has exceeded a specified minimum time. This function is used if the system described here is used as a second private branch exchange and the actuation of the earth button function from the system via one of the lines 6 or 7 assigned lines "E" are passed on to the higher-level private branch exchange will. The time monitoring is carried out by means of a timing element, with this changes its state after the specified time and one of the timer Output signal sent via an AND link the data telegram sent changed in at least one bit. The output of an AND gate is preferred to the corresponding position of a shift register into which the Data telegram is transferred in serial readout. This transfer procedure is understandable to a person skilled in the art even without further representation in the drawing.

A branch circuit 20 is connected to the auxiliary unit 10, to which in turn two normal speech sets 21 and 22 are connected. here the speech wires "a, b" and the earth line "E" are carried out. It can be seen that at all of the connecting organs 8 to 10 normal speech devices and special devices as desired can be connected, each in a RAM of the control unit 1 through corresponding programming of the device allocation is filed, so that the signaling according to the connected apparatus either over the speech cores or via the additional data line "DAT".

The invention is not limited in its implementation to the above given example. Rather, a large number of variants are conceivable, which of the solution shown is also used in the case of fundamentally different designs do. In particular, the implementation is not limited to the implementation discrete logical assemblies, but can also be advantageously programmed with Realize logic - especially using a microprocessor.

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Claims (9)

Telephone private branch exchange claims telephone private branch exchange with at least one subscriber circuit for connecting a terminal device, in particular a speech set, with means for outputting control signals in the form of dialing characters over the speech cores as well as with at least one subscriber circuit to the Connection a terminal with means for exchanging control signals with the terminal via at least one additional signal line, d u r c h e k e n n z e i c h n e t that both types of subscriber circuits for each one connected Terminal in a single subscriber circuit (8, 9, 10) are combined, with the type of signal transmission between by means of an additional switching device Terminal (18, 19, 20) and system either in the form of dialing characters over the voice lines (a, b) or via the additional signal line (Dat) for each subscriber circuit can be set individually. 2. PBX according to claim 1, d a -d u r c h g It is clear that the switching device consists of at least one data register exists, the signal states of which determine the type of data transmission, with the Switching device contains control means which, depending on the stored Signal states the evaluation and generation of control signals either in the form of of dialing signals via the speech lines or as a digital signal via the additional Initiate signal line. 3. Telephone private branch exchange according to one of the preceding claims, d a d u r c h e k e n n z e i c h -n e t that another switching device (17) provided hen is which the additional signal lines of the Connects subscriber circuits cyclically with a common line, the Switchover synchronized with the cyclical query of the subscriber circuits takes place and an adaptation and / or disconnection circuit for each subscriber connection exists only once. 4. private branch exchange according to one of the preceding claims, d a d u r c h e k e n n z e i c h -n e t that a device (16, 17) for generating and interrogation of the signals transmitted via the additional signal lines are provided which is incorporated into a conventional microprocessor-based dialing private branch exchange can be inserted as an additional device. 5. private branch exchange according to claim 4, d a -d u r c h g e k e n n n z e i c h n e t that first line connections (BUS) between the additional device (16, 17) on the one hand and both the power supply part and the data bus of the Processors of the dial-up private branch exchange are provided on the other hand, and the second Line connections between signal input / output circuits (17) of the additional device and the additional signal lines (Dat) of the subscriber circuits. 6. private branch exchange according to claim 5, d a -d u r c h g it is not indicated that the additional device contains a device, which on one specified signal status present on the data bus a serial sequence of output signals is generated for output on the signal line and vice versa, signal sequences appearing on the signal line in signal states converts to transfer to the bus, addressing individual subscriber circuits is also controlled by signal states present on the data bus. 7. private branch exchange according to one of the preceding claims, d u r c h e k e n n n z e i c h -n e t that the actuation of the earth button in the case of a conventional speech set, the corresponding signal in the form of a digital signal train is transmitted via the additional signal line. 8. Telephone private branch exchange according to one of the preceding claims, d a d u r c h e k e n n n z e i c h -n e t that depending on the duration of the actuation the earth button causes different signal trains to be issued. 9. Telephone private branch exchange according to one of the preceding claims, d a d u r c h e k e n n z e i c h -n e t that connecting lines between the Subscriber circuits (8, 9, 10) and the common power supply provided are.