JPS6348239B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic telephone exchange that controls switching of telephone lines and sends and receives various information according to program information.

As the information society becomes more sophisticated, it is required to collect, transmit, store, process, etc. information quickly and accurately, and telephone exchange systems are required to be more versatile and easier to construct and maintain. etc. are required.
Therefore, in recent years, telephone exchanges have been developed that control exchanges and send and receive information in accordance with program information. However, when operating this type of exchange, each time a telephone terminal is connected to or removed from a peripheral control device, line blockage information is sent to the central control device that controls the operation of the peripheral control device using a teletypewriter ( It was necessary to input it via TTY) etc. This input operation is very complicated and is prone to errors, making it impossible to effectively operate the exchange.

The present invention was made in consideration of the above circumstances, and
The purpose of this is to automatically detect terminal telephone line disconnection information from the reply signal to the signal sent from the peripheral control device to the telephone terminal, without inputting line blockage information etc. from a teletypewriter etc. An object of the present invention is to provide an automatic telephone exchange that can be operated effectively by creating a blockage map, etc., and controlling switching operations.

The automatic telephone exchange of the present invention is an automatic telephone exchange having a central control unit that controls switching according to a program, a plurality of telephone terminals, and peripheral circuits connected to these telephone terminals via a hybrid circuit. The peripheral device includes a converter that transmits and receives audio signals, and a peripheral control device that receives data such as signals that control the operation of the telephone terminal or signals that indicate the status of the telephone terminal.

This peripheral control device consists of a modulation circuit that converts transmission data from the central control device into pulse width modulated data and sends it to the telephone terminal, and a modulation circuit that converts the data transmitted from the central control device into pulse width modulated data and transmits it to the telephone terminal, and a pulse width modulated data from the telephone terminal and pulses obtained by the modulation circuit. A phase determination circuit that determines whether the phase of the width-modulated transmission data is in-phase or out-of-phase, and the output of this phase determination circuit demodulates the pulse width modulation data from the telephone terminal and transmits it to the central control unit. It is equipped with a demodulation circuit.

For example, when a telephone terminal receives an inquiry signal from the central control unit, it outputs response data in which the opposite phase of the pulse width modulated transmission data from the central control unit is set as “0” and the in-phase as “1”. By doing so, the phase determination circuit can determine this.

In this case, if the telephone terminal is removed, the pulse-width modulated transmission data from the central control unit is returned as is by the hybrid circuit, so all signals of the same phase are "1" from the phase determination circuit.

Therefore, when the central control unit sends an inquiry signal to a telephone terminal, if the central control unit receives a specific code that is all “1” or all “0”, it can determine whether the telephone terminal has been removed or not. It can be detected that the data transmission/reception line is disconnected.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an automatic telephone exchange according to the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic configuration diagram, and 1 is a central control unit (CC) that is composed of a CPU, RAM, etc., and operates according to program information. Further, reference numeral 2 denotes a peripheral circuit including a converter 3 and a peripheral control device 4, respectively. Each of these peripheral circuits 2 is responsible for the operation of four-line telephone terminal equipment 5, such as a rotary dial telephone, a push-button telephone, and a key telephone developed in recent years. However, the central control device 1
and each peripheral control device 4 are connected by a clock signal line 6, a transmission bus 7a, and a reception bus 7b to transmit and receive information. The communication memory 8, whose operation is controlled by the central control unit 1, is connected to each of the converters 3 via a PCM transmission bus 9a and a PCM reception bus 9b to transmit and receive audio signals.

The converter 3 is, for example, as shown in FIG.
A hybrid circuit 11, a transmission filter 12, and a codec 1 each corresponding to a four-line telephone terminal.
3, and a reception filter 14. Then, between the telephones connected by line according to the line connection function of the peripheral control device 4, which will be described later,
A call is made as follows. That is, the analog voice signal from the telephone is sent to the hybrid circuit 1.
1 to a transmission filter 12, filtered and supplied to a codec 13. This codec 13 samples the analog audio signal, encodes it with PCM, and outputs it to a predetermined time slot, that is, a time slot given to the main line.
It is transmitted via the PCM transmission bus 9a. this
The audio signal (PCM
After the signal (signal) is temporarily stored in the call memory 8, it is sent to the time slot given to the other party's telephone upon receiving a command from the central controller 1.
It is sent to the PCM reception bus 9b. Therefore, the audio signal (PCM) sent to the above time slot
signal) is input to the other party's codec 13 and restored to an analog signal. Thereafter, the signal is filtered through the reception filter 14 and supplied from the hybrid circuit 11 to the telephone set. Also, the voice signal from the other party's telephone is similarly transmitted to the telephone on the other party's side. In this way, voice signals are transmitted and received between the telephones connected by line here, that is, telephone calls are made.

Now, the line connection control for the above-mentioned telephone conversation is performed by the peripheral control device 4. This peripheral control device 4 inputs various data signals such as hook-on/hook-off signals from a telephone, dial signals, or key telephone operations, and transmits each of the above information signals to the central control device according to a predetermined data format. Send to. It also analyzes data from the central control device 1 and issues a ringing signal to the telephone. The peripheral control device 4 having such a function is configured as shown in FIG. 3, for example. That is, telephone hook-on/hook-off information, dial signal information, etc. are demodulated by a demodulation circuit 21 and stored in a data register 22 together with code information given to the telephone. The information data stored in this register 22 is read out at a time slot described later and sent to the central control unit 1 via the transmission bus 7a described above. On the other hand, information data sent from the central control unit 1 via the reception bus 7b is taken into the data register 23 and stored in accordance with the address information. The data stored in this register 23 is
The signal is supplied to a command decoder 24, where the command is decoded, and also supplied to a modulation circuit 25. The data from the central control unit 1 modulated by the modulation circuit 25 is sent to the telephone specified by the command decoding.

From the above explanation, it is clear that data is exchanged between the peripheral control device 4 and the terminal 5. This means that peripheral control device 4 and terminal 5
A hybrid coil (not shown) is connected between
You can see that it is connected via.

Incidentally, the data sending timing from the data register 22 is determined as follows. That is, the data transmitted and received on the transmission bus 7a and the reception bus 7b is bit-synchronized with the clock signal provided on the clock signal line 6. This clock signal is sequentially counted by a frequency divider 26, and the counted value is supplied to a comparator 27.
This comparator 27 inputs the address number to the other side and detects a match between the counted values, and when a match is detected, it determines this as the time slot given to itself. That is, the format of the data sent to the transmission bus 7a is configured in a time-division manner for each peripheral circuit 2, and the data in each time slot corresponds to a predetermined peripheral circuit 2, respectively. Therefore, the comparator 27
identifies the time slot assigned to itself from the count value obtained by the frequency divider 26.
The data register 22 is then controlled by the control circuit 28 to which the above-mentioned identification information is input, and the data is sent to the above-mentioned time slot. If the time slots are different when data is stored in the data register 22, the data is held until its own time slot arrives, and then is sent out.

On the other hand, when data is taken into the data register 23 from the reception bus 7b, since address information is attached to the data, this address information is first taken into the address register 29. Then, the comparator 30 compares this address information with the address number described above, and when a match is detected, the control circuit 28 inputs the data into the data register 23. Therefore, the data register 23 stores only the data issued to itself from the reception bus 7b.

By the way, when the blockage information sense command (data) from the central control unit 1 is set in the data register 23, this data is decoded by the command decoder 24 and sent to the first flag circuit 31.
is set. By setting the flag circuit 31, a command is set to send the blockage information of the peripheral control device 4 to the central control device 1. The second flag circuit 32 is set upon receiving the detection signal from the demodulation circuit 21, and a command is set to send the data to the central control unit 1 since the data has been received from the telephone. Further, the third flag circuit 33 is set by the command decoder 24 to set a command to send the data received from the central control unit 1 to the telephone set. Therefore now,
When the first flag circuit 31 is set, the control circuit 28 energizes the blockage information circuit 34 and writes the blockage information stored in the circuit 34 to the data register 22. The control circuit 28 also includes second and third flag circuits 32,
33 is detected and data register 2 is set.
It controls data transmission from 2 and 23. still,
Needless to say, data is sent from the data register 22 by detecting the flag and detecting the time slot described above.

Further, to further describe these flag circuits 31, 32, 33, each flag circuit 31, 32, 3
3, a signal is applied from an initial circuit consisting of a resistor 35 and a capacitor 36. The initial circuit charges the capacitor 36 via the resistor 35 when the power is turned on, and initially outputs a LOW level signal for a period determined by its time constant. This signal causes the flag circuit 3 to
1 is set, and the flag circuits 32 and 33 are reset (cleared). Therefore, when the peripheral control circuit 4 is powered on, its blockage information is unconditionally sent to the central control unit 1. Moreover, the central control device 1 periodically detects the above-mentioned blockage information. As a result, the central control device 1 converts the time slot information and the blockage information in the time slot into a predetermined data format,
A blockage map of each line is created. At the same time, if the circuit board on which the peripheral control device 4 is mounted is removed from the peripheral circuit 2, there will be no response to the blockage information to the command, so the mounting state of the circuit board will be detected from now on.

Information (data) is exchanged between the telephone and the peripheral control device 4 via the demodulation circuit 21 and the modulation circuit 25, as described above. These circuits 21 and 25 are configured as shown in FIG. 4, for example. The modulation circuit 25 is a flip-flop 4
5, 47 and an AND circuit 43, it converts the transmission data from the register 23 into pulse width modulated data and transmits it to the telephone terminal. The phase of pulse width modulated data from the telephone terminal is determined by a flip-flop 48 and an EX-OR circuit 49, and then demodulated by a flip-flop 50.
After the system is reset by the initialization signal shown in FIG. 5a, this circuit divides the 4.8kHz reference clock signal shown in FIG. 5b by a flip-flop (FF) 41 to 2.4kHz as shown in FIG. is generating a signal. This Q output signal of FF41,
The reference clock signal inverted via the inverter 42 is ANDed in an AND circuit 43 to generate a first reference signal shown in FIG. 5d. Also, the output signal of FF41 is AND circuit 4
4, and a second reference signal shown in FIG. 5e is generated from the output signal of the inverter 42. The FF 45 driven by these first and second reference signals samples the signal from the data register 23 shown in FIG. 5f at the arrow point in the figure, and outputs it as shown in the figure g.
This data signal is converted by the AND circuit 46 as shown in FIG. That is, the data "0011000" illustrated in FIG. 5f is pulse width modulated as shown in FIG. 5i. Here, if the pulse width of “0” is T, the pulse width of “1” is 2T,
If "1" continues, the level is inverted.

On the other hand, FF48, which inputs the above output data,
The signal shown in FIG. 5j is obtained at its output. The output signal of the FF 48 is input to an EX-OR circuit 49, and is subjected to exclusive OR processing with, for example, data k in FIG. 5 from the telephone. Now, suppose that the telephone terminal wants to send, for example, response data "0000110" to the central control unit. "0" indicates the opposite phase of the input data, and "1" indicates the same phase as the input data, as shown in Figure 5k. Send pulse width modulation data.

That is, the input data to the telephone terminal is as shown in Figure 5i.
Therefore, depending on the data you want to send, this waveform can be sent back in reverse phase as ``0'' or as ``1'' in the same phase. The phase is reversed. Therefore, the waveform in FIG. 5k is delayed by d compared to that in FIG. 5i. Such response data is sent to the EX-OR circuit 49 and compared in phase with the input data i in FIG. The output signal of the EX-OR circuit 49 shown in FIG. ing.

According to the peripheral control device 4 equipped with such a demodulation circuit 21 and a modulation circuit 25, the data sent from the telephone sets the information "1" in phase with the data received from the central control device 1, and 0'' is defined as the reverse phase. Therefore, the demodulation circuit 21 of the peripheral control device reproduces a signal that is in phase with the transmitted signal as "1" and a signal that is in opposite phase as "0". Moreover, when such demodulation is performed, the first bit always becomes "1: HIGH level" as shown in FIG. 6, an example of the data.

According to this data format, when the telephone does not output data, the data register 22 is always supplied with information of "0". When the telephone transmits some information, the first bit of the information supplied to the data register 22 is always at the "1" level. Therefore, the data register 22 may regard, for example, 10 bits as data from the detection of the "1" level, and store the data as shown in FIG. Also, consider the case where the telephone 5 is removed from the peripheral control device 4 in the above embodiment. As is well known, the peripheral control device 4 and the telephone 5 are connected by a signal line via a hybrid coil. If the telephone is removed, even if data is sent from the central controller 1 to the telephone via the peripheral controller 4, this hybrid coil will simply serve as a return point, and the peripheral controller 4 will
The data is returned to the peripheral control device 4 as is.

Conversely, when the telephone 5 is connected to the peripheral control device 4, the hybrid coil does not return any discernible processing level data.
That is, the data register 22 is always supplied with information "0".

That is, since the above information data indicates a specific change in the hybrid coil, it is possible to detect connection or disconnection of the telephone by using this change.

In this embodiment, based on the above principle, a transmission signal coming from a predetermined bit string from the central controller 1,
For example, data that is all "1" is sent to the peripheral control device 4.
send to The peripheral control device 4 modulates the above-described transmission signal and normal information data as described above without making any distinction between them, and sends the modulated signals to the telephone set 5.

The sent signal reaches at least the hybrid coil. Here, as described above, the data stored in the data register 22 becomes in a specific manner due to disconnection or connection of the telephone 5. Such data is sent back to the central controller 1.

According to the modulation/demodulation method in this embodiment, the telephone 5
If it is removed from the peripheral control device 4 or its connection line is disconnected, the data supplied from the demodulation circuit 21 to the data register 22 always returns as the same phase and becomes "1". Therefore, as shown in FIG. 8, all "1" data is read into the data register 22 as shown in FIG.

This is transmitted to the central control device 1. Then, in the central control device 1, all "1"s are sent as transmission signals.
Compare with the data. As mentioned above, if all 1's are present, the line is disconnected. In this way, the control device 1 can recognize line disconnection. Therefore, the central control unit 1 blocks the line based on the line disconnection information, updates the blockage map, and shifts to new exchange control. Therefore, unlike the conventional system, there is no need for complicated operations such as detecting a line disconnection and inputting the information to the central control unit 1 using a typewriter or the like.

As explained above, according to the automatic telephone exchange according to the present invention, it goes without saying that various information such as blockage information of the telephone terminal can be automatically sent to the central control unit when the power is turned on or when the circuit board is mounted. Even if the phone terminal is removed or the line is disconnected, the information can be sent automatically. Therefore, unlike conventional systems, there is no need for complicated operations such as inputting various information on a teletypewriter each time depending on the line status, and the system is extremely easy to handle. Furthermore, errors associated with the above input operations are not caused.
Therefore, effective line switching control and transmission and reception of various information can be performed with accurate understanding of the line status. Also, maintenance is very easy and can be done quickly.

Note that the present invention is not limited to the above embodiments. For example, the format of transmitted and received data, the manner of transmitting and receiving audio signals, etc. may be determined according to specifications. Furthermore, the internal configuration of the peripheral control device may be determined as appropriate. In short, the present invention can be implemented with various modifications without departing from the gist thereof.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention;
FIG. 2 is a diagram showing an example of the configuration of a converter, FIG. 3 is a diagram showing an example of the configuration of a peripheral control device, FIG. 4 is a configuration diagram of a modulation circuit and a demodulation circuit, and FIGS. 4 is a signal diagram for explaining the operation of the circuit shown in FIG. 4, and FIGS. 6 to 9 are diagrams showing the format of transmitted and received data, respectively. DESCRIPTION OF SYMBOLS 1...Central control device, 2...Peripheral circuit, 3...Converter, 4...Peripheral control device, 5...Telephone terminal equipment, 11
...Hybrid circuit, 12, 14... Transmission (reception) filter, 13... Codec, 21... Demodulation circuit, 2
2, 23...Data register, 24...Command decoder, 25...Modulation circuit, 31, 32, 33...Flag circuit, 34...Block information circuit.

Claims (1)

[Scope of Claims] 1. In an automatic telephone exchange having a central control unit that performs switching control operations according to a program, a plurality of telephone terminals, and peripheral circuits connected to these telephone terminals via a hybrid circuit, the peripheral device consists of a converter that sends and receives audio signals, and a peripheral control device that receives data such as signals that control the operation of the telephone terminal or signals that indicate the status of the telephone terminal, and this peripheral control device is connected to the central control device. a modulation circuit that converts transmission data from the device into pulse width modulated data and transmits it to the telephone terminal; a phase determination circuit that determines whether the phase of transmission data is in-phase or out-of-phase; and a demodulation circuit that demodulates pulse width modulation data from the telephone terminal from the output of the phase determination circuit and transmits the demodulated data to the central controller. and, when the central control unit sends an inquiry signal to the telephone terminal, if the central control unit receives a specific code that is all “1” or all “0”, the telephone terminal is removed. An automatic telephone exchange characterized in that it detects when a data transmission/reception line is disconnected.