JP2955377B2 - Telephone switching equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a key telephone apparatus, and more particularly to a key telephone apparatus having an add-on module for enhancing the function of a key telephone and a key telephone having a structure to which the add-on module can be connected.

[0002]

2. Description of the Related Art FIG. 9 is a block diagram showing the general configuration of a conventional key telephone apparatus. The key telephone apparatus illustrated in FIG. 9 includes a plurality of add-on modules 14 and 18 provided for enhancing the functions of the key telephone, including the main apparatus 1, and these add-on modules 14 and 18 are connectable. A plurality of key telephones 10 and 20 having the configuration are provided, respectively. Note that FIG.
Here, for convenience of illustration, only two add-on modules and two key telephones are described.

In FIG. 9, a main unit 1 includes a central office line 17a,
Office line interface unit 2 connected to 17b
And a plurality of button telephones (not shown) such as a key telephone 10 and a plurality of key telephones including a key telephone 20 and a plurality of key telephones (not shown). (Not shown) comprises a key telephone interface unit 5 having the same configuration as the key telephone interface unit 4 having a plurality of ports so as to be connectable. The main apparatus 1 includes a plurality of key telephone interface units (not shown) having the same configuration as these in addition to the two key telephone interface units. The main device 1 further includes a time switch 3, a key telephone interface unit 4,
5 and a central control circuit 6 for controlling a plurality of key telephone interface units (not shown) under control. The central control circuit 6 includes a CPU 7, a ROM 8, and a RAM 9. Details of the above configuration will be described later.

On the other hand, the key telephone 10 includes not only a data transmission means 11, a transmission / reception circuit system 12, and a CPU 13, but also a dial pad, an extension key switch, an LED for an extension key switch, an office key switch. , And an LED for a central line key switch (both not shown).

The add-on module 14 includes a selector circuit 15, a CPU 16, and normally open contacts 35a to 35n.
And so on. Selector circuit 15
ND circuits 15a and 15c, inverter circuits 15b and O
It has an R circuit 15d. Normally open contacts 35a to 35n
Is closed by a pressing operation of one-touch keys (not shown) provided on the keyboard of the add-on module 14 in correspondence with the normally open contacts 35a to 35n, respectively. These one-touch keys (not shown) are assigned, for example, as one-touch keys for accessing abbreviated dial data stored in the RAM 9 or the like of the central control circuit 6 in advance.

The configuration of the key telephone 10 and the configuration of the add-on module 14 will be further described.

In the following description, it is assumed that the key telephone 10 is in a state in which the central office telephone can perform office line communication, that is, a state in which the key telephone 10 is capturing office lines 17a and 17b through the main unit 1.

The data transmission means 11 comprises, for example, a ping-pong transmission data transformer and a ping-pong transmission circuit. The ping-pong transmission circuit is the CP of the key telephone 10 side.
Under the control of U13, it receives serial digital data of a PCM signal (voice signal data) transmitted from the corresponding port of the key telephone interface unit 4 by a ping-pong transmission method and control data through a ping-pong transmission data transformer. . The PCM signal of the serial digital data is output to the transmission / reception circuit system 12, while the control data is output to the C / C.
Output to PU 13 and add-on module 14. The ping-pong transmission circuit also receives a PCM signal (voice signal data) output from the transmission / reception circuit system 12 and control data output from the CPU 13 or the add-on module 14. The PCM signal and the control data are converted into serial digital data, and the serial digital data is output to a corresponding port of the key telephone interface unit 4 through a ping-pong transmission data transformer.

The transmission / reception circuit system 12 includes a codec, a transmission amplifier, a reception amplifier, a handset transmitter, and a handset receiver. Illustration of these units constituting the transmission / reception circuit system 12 is omitted.

[0010] The CPU 13 receives control data output from the data transmission means 11. Then, by analyzing the received control data, it is detected whether or not the uplink data output request signal is included in the control data. When the CPU 13 determines that it is necessary to send various control data from the key telephone 10 to the main device 1, the control data provided from the data transmission unit 11 includes an upstream data output request signal. Is recognized, the AND circuit 1 configuring the selector circuit 15
An input terminal of the input terminal 5a, the input terminal of the inverter circuit 15b, and the CPU 16 transmit an upstream data transmission inhibition signal of a logical level "H". At the same time, CPU1
Reference numeral 3 sends various control data in the form of serial data to the other input terminal of the AND circuit 15a. As a result, from the OR circuit 15d, A
The various control data sent to the other input terminal of the ND circuit 15a is given to the data transmission means 11 in the form as it is. When the CPU 13 determines that it is not necessary to transmit the above-described various control data to the main device 1, the CPU 13 determines that the control data provided from the data transmission unit 11 includes the upstream data output request signal. When you recognize, A
One input terminal of ND circuit 15a and inverter circuit 1
A logical level "L" uplink data transmission permission signal is transmitted to the input terminal 5b and the CPU 16. At this time, the CPU 16 of the add-on module 14 recognizes the necessity of sending control data corresponding to this closing operation to the main device 1 by the closing operation of any of the normally open contacts 35a to 35n, and performs a predetermined operation. Is output from the selector circuit 15 to the data transmission means 11 as it is.

Here, the operation of the selector circuit 15, the CPU 13 and the CPU 16 will be described. When the CPU 13 outputs an upstream data transmission inhibition signal of logic level “H”, one input terminal of the AND circuit 15a and the CPU 1
6, the signal is applied with the logic level "H". On the other hand, when the signal passes through the inverter circuit 15b, the logical level thereof is inverted from "H" to "L" and applied to one input terminal of the AND circuit 15c. The CPU 16 determines that the output of the control data to be transmitted to the main device 1 from the add-on module 14 is prohibited by the output of the signal from the CPU 13. Then, the output of the control data to one input terminal of the AND circuit 15c is stopped. The reason why the CPU 16 checks whether or not the upstream data transmission prohibition signal is output from the CPU 13 is as follows.
U13 sends the control data to the main device 1 side, so that the control data from CPU 16
This is to prevent the output of control data from the CPU 16 when the data cannot be sent to the side. At the same time as the output of the upstream data transmission inhibition signal of the logic level “H”, the CP
When the control data is output from U13 to the other input terminal of the AND circuit 15a, the logical level of the output signal from the AND circuit 15c is "L". , The control data is output.

Contrary to the above, when the CPU 13 outputs an upstream data transmission permission signal of logic level "L",
The signal is applied to one input terminal of the D circuit 15a and the CPU 16 with the logic level "L". On the other hand, when the signal passes through the inverter circuit 15b, the logical level thereof is inverted from "L" to "H" and applied to one input terminal of the AND circuit 15c. When the above signal is output from the CPU 13, the CPU 16 sends the main device 1 from the add-on module 14 side.
It is determined that the output of control data to be transmitted to is permitted. Then, output of the control data to one input terminal of the AND circuit 15c is started. At this time, regardless of whether the control data is output from the CPU 13 to one input terminal of the AND circuit 15a, since the logical level of the output signal from the AND circuit 15a is "L", the OR The control data on the CPU 16 side is output from the circuit 15 d to the data transmission means 11.

Here, the upstream data output request signal means that the key telephone 1
0, a signal given to the add-on module 14 at predetermined intervals, which is a request signal to output some control data to the key telephone 10 and the add-on module 14. For example, when the upstream data output request signal is given from the main device 1, the key telephone 1
0, or various control data from the CPU 16 of the add-on module 14 to the main unit 1 are selectively transmitted.

The key telephone 20 has the same configuration as the key telephone 10. That is, in addition to the data transmission means 21, the transmission / reception circuit system 22, the CPU 23, etc., the dial pad, the extension key switch, the extension key switch LED, the office key switch, the office key switch LED, etc. (Both are not shown). The add-on module 18 has the same configuration as the add-on module 14. That is, the AND circuit 4
0a, 40c, inverter circuit 40b and OR circuit 40
In addition to the selector circuit 40 having d, a CPU 46, normally open contacts 45a to 45n, and the like are provided. Therefore, a detailed description of the configuration of the key telephone 20 and the configuration of the add-on module 18 will be omitted.

When the add-on module 14 is not connected to the key telephone 10, the key telephone 10 transmits data so that various control data output from the CPU 13 is directly supplied to the data transmission unit 11. The means 11 and the CPU 13 are connected.
Also, when the add-on module 18 is not connected to the key telephone 20,
The data transmission means 2 is provided so that various control data output from the CPU 23 is directly given to the data transmission means 21.
1 and the CPU 23 are connected.

[0016]

In the conventional add-on module 14 (or add-on module 18) configured as described above, the CPU 13 of the key telephone 10 (or the CPU 23 of the key telephone 20) with respect to the main device 1 receives a signal. Transmission of control data and transmission of control data from the CPU 16 on the add-on module 14 side (or the CPU 46 on the add-on module 18 side) are performed by two AND circuits, one inverter circuit, and one OR Since the selective adjustment is performed by the selector circuit 15 (or the selector circuit 40) including the circuit, the number of components constituting the add-on module 14 (or the add-on module 18) is unavoidably increased. Therefore, there is a problem that an add-on module different from the above-described add-on module 14 cannot be connected in order to further increase the function of the key telephone 10 as well as to increase the cost.

In order to solve the above-mentioned problems, a method of connecting a plurality of add-on modules to a plurality of ports of the key telephone interface unit 4 to which the key telephone 10 is connected has been proposed. Was done. In the key telephone apparatus adopting this method, the key telephone 10 and a plurality of add-on modules are directly connected to the main device 1, so that the key telephone 10 and the plurality of add-on modules output the respective signals. The transmission timing of each uplink control data is determined by the central control circuit 6 so that the transmission timings of the uplink control data do not overlap.
Can be controlled directly.

However, according to the above method, since the add-on module is directly connected to each port of the key telephone interface unit 4, a vacant port is closed, and the number corresponding to the number of connected add-on modules is reduced. However, there is a problem that the number of connected key telephones is reduced.

Accordingly, the present invention has been made in consideration of the above circumstances, and has as its object to reduce the number of parts constituting an additional device and to provide a telephone set connected to each port of a telephone interface unit. It is an object of the present invention to provide a telephone exchange device to which a plurality of additional devices can be connected without greatly reducing the number of devices and which can greatly enhance the functions of a telephone.

[0020]

In order to achieve the above object, the present invention provides at least one telephone for transmitting control data in accordance with a key operation, and the telephone based on the control data transmitted from the telephone. In a telephone exchange device comprising a main device for exchange connection between the office or the line and the telephone, a plurality of additional devices are cascaded to at least one of the telephones, and each of the additional devices is A control data generating means for generating control data to be transmitted to the main device, and a data transmission prohibition / instruction for instructing a subsequent additional device to output or prohibit output of the control data generated by the control data generation means. Data transmission prohibition / permission signal transmission means for transmitting a permission signal; Based on the variable signal, the priority setting means for said control data generated by the control data generating means for setting the priority to be transmitted to the main device,
The data transmission prohibition / permission signal transmission means generates the data transmission prohibition / permission signal to be transmitted to the subsequent additional device based on the set priority.

[0021]

A plurality of additional devices are connected in cascade to at least one of the telephones. The data transmission prohibition / permission signal transmitting means transmits a data transmission prohibition / permission signal to a subsequent additional device, and based on this signal, the priority setting means sets the priority for transmitting control data to the main device. Set.

On the other hand, when the control data is not output from the control data output means and the control data is not output from the control data output means of any other add-on module, the determination of each add-on module is performed. A control data output inhibition signal should have been given from the control unit to the means. At this time, the control data from the control unit is sent to the main unit as uplink data.

As is apparent from the above description, the number of components constituting the add-on module can be reduced, and a plurality of add-on modules can be connected without reducing the number of key telephones connected to the ports of the key telephone interface unit. The module can be connected, and the function of the key telephone can be greatly enhanced.

[0024]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an overall configuration of a key telephone apparatus to which one embodiment of the present invention is applied.
The key telephone apparatus shown in FIG. 1 is an add-on module provided to enhance the functions of the key telephone including the main apparatus 1 (that is, an extension terminal for additional buttons arranged beside the key telephone). 24, 34, and
The key telephone 10 has a configuration to which the add-on modules 24 and 34 can be connected.

The internal configurations of the add-on modules 24 and 34 and the key telephone 10 will be described later in detail. In FIG. 1, for the sake of illustration, two add-on modules and one key telephone are shown.
Although only one unit is described, a plurality of key telephones are connected to the main device 1 according to the present embodiment, and at least two or more add-on modules are connected to each of the plurality of key telephones. It is assumed that

In FIG. 1, the main unit 1 includes a central office line 17a,
Office line interface unit 2 connected to 17b
And a button telephone interface unit 4 having a plurality of ports to which a plurality of key telephones (not shown) including a key telephone 10 can be connected, and a key telephone having the same configuration as the key telephone interface unit 4. An interface unit 5. The main apparatus 1 includes a plurality of key telephone interface units (not shown) having the same configuration as these in addition to the two key telephone interface units. The main device 1 further controls the time switch 3, the line interface unit 2, the time switch 3, the key telephone interface units 4 and 5, and a plurality of key telephone interface units (not shown) in addition to the above-described units. The central control circuit 6 is also provided. The above configuration is described in more detail below.

The office line interface unit 2 comprises an office line 1
7a, 17b, which are provided for connecting the key telephone apparatus to the key telephone apparatus, including a line interface circuit, a transformer, a 2-wire 4-wire conversion circuit, a reception amplifier, a transmission amplifier,
It has a codec and a control circuit. Although illustration of these units constituting the office line interface unit 2 is omitted, the configurations of these units are as follows.

That is, under the control of the control circuit, the office line interface unit circuit detects an incoming call signal from the office line, captures the office line, sends out a dial pulse signal, and the like. The transformer is connected between the office line interface circuit and the 2-wire 4-wire conversion circuit. 2 lines 4
The line conversion circuit receives an analog signal (received voice signal or the like) provided from the local lines 17a and 17b through the local line interface circuit and the transformer, and outputs the analog signal to the receiving amplifier. The two-wire / four-wire conversion circuit also receives an analog signal (speech sound signal or the like) output from the transmission amplifier and passes it through the transformer and the office line interface circuit to the office line 17.
a, 17b.

The receiving amplifier receives and amplifies the analog signal (received voice signal or the like) given from the two-wire / four-wire conversion circuit, and outputs the amplified signal to the codec. On the other hand, the transmission amplifier receives and amplifies an analog signal (transmission voice signal or the like) output from the codec, and then outputs the amplified signal to the two-wire / four-wire conversion circuit.

The codec receives an analog signal (a received voice signal or the like) amplified by a receiving amplifier, digitizes the analog signal, and converts it into a PCM signal. Then, this PCM signal is output to the time switch 3 through a time slot allocated on the incoming PCM highway. The codec also outputs the P code output from the time switch 3 through the time slot allocated on the outgoing PCM highway.
Receives CM signal. Then, after converting the PCM signal into an analog signal (a transmission voice signal or the like), the PCM signal is output to a transmission amplifier.

The control circuit is placed under the control of the central control circuit 6 together with the time switch 3 described above. That is, the control circuit exchanges control signals with the central control circuit 6 through the data highway. The control circuit is connected from the central control circuit 6 to the office lines 17a,
When a control signal indicating that the line is to be captured is given, the line interface circuit is controlled in accordance with the control signal to control the line 17.
a and 17b are captured. When the central office interface circuit detects that a call signal has arrived from the office lines 17a and 17b, the control circuit sends a data signal indicating that the call signal has arrived to the central control circuit through the data highway. 6 is output.

The time switch 3 comprises a communication memory, a counter circuit and the like. Then, under the control of the central control circuit 6, by multiplexing, demultiplexing, or phase-converting the signals output through the plurality of incoming PCM highways, time division is performed between the corresponding incoming PCM highways and outgoing PCM highways. It is designed to be exchanged.

That is, the time switch 3 receives the PCM signal given from the time slot allocated on the incoming PCM highway and forms the key telephone interface unit 4 through the time slot allocated on the outgoing PCM highway. Output to each of the plurality of ping-pong transmission circuits. The time switch 3 also receives a PCM signal output from each of the ping-pong transmission circuits of the key telephone interface unit 4 through a time slot allocated on the incoming PCM highway, and outputs it to the time allocated on the outgoing PCM highway. Output to the codec through the slot.

The time switch 3 further configures the key telephone interface unit 5 to transmit a PCM signal output from the codec through a time slot allocated on the incoming PCM highway and a time slot allocated on the outgoing PCM highway. To the plurality of ping-pong transmission circuits, and through each of the ping-pong transmission circuits constituting the key telephone interface unit 5 through a time slot allocated on the incoming PCM highway and a time slot allocated on the outgoing PCM highway. The output PCM signal is provided to the codec.

Button telephone interface unit 4
As is apparent from the above description, a plurality of ping-pong transmission circuits can be connected to a plurality of key telephones (not shown) including the key telephone 10 shown in FIG.
The configuration includes the same number of ping-pong transmission data transformers and control circuits (both not shown) as the ping-pong transmission circuit.

Of the plurality of ping-pong transmission circuits described above, the ping-pong transmission circuit corresponding to the key telephone 10 is as follows.
Under the control of the control circuit, serial digital data of a PCM signal (audio signal data) transmitted from the time switch 3 through a time slot allocated on the outgoing PCM highway and control data supplied from the control circuit is converted into a digital signal. The data is transmitted to the key telephone 10 through the ping-pong transmission data transformer corresponding to the ping-pong transmission circuit by the ping-pong transmission method (digital transmission method). The ping-pong transmission circuit also converts serial digital data of a PCM signal (voice signal data) and control data sent from the key telephone 10 by a ping-pong transmission method through a ping-pong transmission data transformer corresponding to the ping-pong transmission circuit. In response to the PCM signal,
The data is output to the time switch 3 through the time slot allocated on the M highway, while the control data is output to the control circuit of the key telephone interface unit 4. The control circuit receives control data sent from the central control circuit 6 through the data highway,
This is output to the ping-pong transmission circuit corresponding to the key telephone 10. The control circuit also receives control data of the key telephone 10 provided from a ping-pong transmission circuit corresponding to the key telephone 10 and outputs the control data to the central control circuit 6 through a data highway. I have. The ping-pong transmission circuit corresponding to a key telephone (not shown) other than the key telephone 10 operates in the same manner as described above.

Button telephone interface unit 5
Has the same configuration as the key telephone interface unit 4.

That is, each of the plurality of ping-pong transmission circuits provided in the key telephone interface unit 5 includes:
Under the control of the control circuit, serial digital data of a PCM signal (voice signal data) transmitted from the time switch 3 through a time slot allocated on the outgoing PCM highway and control data supplied from the control circuit are corresponded. To the corresponding key telephones (not shown) through a ping-pong transmission data transformer. Each of the above ping-pong transmission circuits,
Also, it receives serial digital data of a PCM signal (voice signal data) and control data transmitted by a ping-pong transmission method from a corresponding key telephone (not shown) through corresponding ping-pong transmission data transformers. Then, the PCM signal is output to the time switch 3 through the time slot allocated on the incoming PCM highway, while the control data is output to the control circuit of the key telephone interface unit 5. As described above, the control circuit receives the control data sent from the central control circuit 6 through the data highway, and outputs the control data to each of the ping-pong transmission circuits described above. The control circuit also receives control data for each key telephone (not shown) provided from each of the ping-pong transmission circuits and outputs the control data to the central control circuit 6 through the data highway.

The central control circuit 6 includes the CPU 7 and the RO
M8 and RAM 9 are provided.

The ROM 8 contains a control program and the like, and stores non-volatilizable fixed data. The RAM 9 stores, for example, speed dial data,
Various data are stored. The speed dial data stored in the RAM 9 will be described later in detail.

The CPU 7 includes the time switch 3 described above, the various parts constituting the central line interface unit 2, and the key telephone interface units 4 and 5 (as described above, for convenience of illustration in FIG. 1 and only two add-on modules are shown, while only two of the key telephone interface units configured to allow connection of a plurality of key telephones are shown. The respective units constituting the main unit 1 of the key telephone device, such as the respective units, are placed under the control thereof.

The CPU 7 according to the present embodiment has various functions represented by functional blocks indicated by reference numerals 7a to 7e. That is, in the CPU 7, an uplink data input unit 7a, an uplink data analysis unit 7b, an ADM key processing unit 7c, a DKT input processing unit 7d, and a downlink data / uplink request data transmission unit 7e are constructed by software.

The upstream data input means 7a reads the control information transmitted from the key telephone interface unit 4 through the data highway as upstream data given from the key telephone 10 or the add-on modules 24 and 34. The upstream data input unit 7a sends the read upstream data to the upstream data analysis unit 7b. The control information is given from the control circuit to the upstream data input means 7a through the data highway by the CPU 7 outputting a predetermined control signal to the control circuit of the key telephone interface unit 4 through the data highway. Uplink data input means 7a
Is also related to the control information transmitted from the key telephone interface unit 5 through the data highway,
The same processing as above is performed.

The upstream data analysis means 7b reads the upstream data sent from the upstream data input means 7a and analyzes the upstream data so that the upstream data is transmitted to the CPU 13 and the add-on module 24 of the key telephone 10 side.
Side CPU 26 or add-on module 34 side CP
It is determined from which one of U66 it is transmitted. As a result of analyzing the above uplink data, the CP of the key telephone 10 is
When determining that the data is transmitted from U13, the upstream data analysis unit 7b transmits the upstream data to the DKT input processing unit 7b. On the other hand, as a result of analyzing the upstream data, if it is determined that the data is transmitted from the CPU 26 of the add-on module 24, the upstream data analyzing means 7
b sends out the upstream data to the ADM key processing means 7c. Also, as a result of analyzing the upstream data, when it is determined that the upstream data is transmitted from the CPU 66 of the add-on module 34, the upstream data analyzing unit 7b transmits the upstream data to the ADM key processing unit 7C. It has become.

The above-mentioned upstream data is whether the upstream data is transmitted from the CPU 13 of the key telephone 10 or not.
Or, the one sent from the CPU 26 of the add-on module 24 or the CPU of the add-on module 34
It is assumed that the data has been configured so that the upstream data analysis means 7b can analyze whether or not the data has been transmitted from the data transmission unit 66.

Upon receiving the uplink data from the uplink data analysis means 7b, the DKT input processing means 7d executes a signal processing operation based on the uplink data. The signal processing operation performed by the DKT input processing means 7d based on the uplink data includes, for example, at the time of an extension call of the key telephone 10,
An LED lighting control signal for lighting an extension key switch LED (not shown) of the key telephone 10, a CP of a key telephone (not shown) different from the key telephone 10.
A data signal indicating that a call has been made to U, and a signal for notifying CPU 13 of a response to the call of key telephone 10 from a key telephone (not shown) different from key telephone 10. There is signal creation.
In addition, when the central office telephone call of the key telephone 10, the key telephone 1
For example, creation of an LED lighting control signal for lighting an LED (not shown) for the office line key switch of 0, a data signal indicating that there is a call from the office line side, and the like are also included. DK
The T input processing means 7d uses a signal or the like obtained as a result of executing a signal processing operation based on the uplink data provided from the uplink data analysis means 7b as control data as downlink data /
It is provided to the upstream request data transmitting means 7e. The DKT input processing means 7d executes the same signal processing as described above even during an extension call or a central office call of a key telephone (not shown) other than the key telephone 10.

The ADM key processing means 7c is provided from the upstream data analysis means 7b to the CPU 26 on the add-on module 24 side.
When the corresponding uplink data or the uplink data corresponding to the CPU 66 of the add-on module 34 is provided, the signal processing operation based on these uplink data is executed. AD
The signal processing operation performed by the M key processing means 7c based on the above-mentioned up data includes, for example,
Creation of a shortened dial data read signal for reading the shortened dial data corresponding to the uplink data is mentioned. The ADM key processing means 7 c
A signal or the like obtained as a result of executing a signal processing operation based on the uplink data given from b is supplied to the downlink data / uplink request data transmitting means 7e as control data.

Downlink data / uplink request data transmission means 7e
When the control data is given from the DKT input processing means 7d, the control data is used as downlink data through the data highway and the port of the key telephone interface unit 4 to which the key telephone 10 is connected. CPU 26 of module 24 and CPU 36 of add-on module 34
To send to. Downlink data / uplink request data transmission means 7e
Also, when the control data is given from the ADM key processing means 7c, the control data, that is, the speed dial data read signal is sent to the RAM 9, and the speed dial data corresponding to the read signal is transmitted from a predetermined storage area of the RAM 9. Perform a read. The abbreviated dial data read out from the RAM 9 by the downlink data / uplink request data transmitting means 7e is provided by the CPU 7 from the central control circuit 6 to the station line interface unit 2 through the data highway. In other words, the abbreviated dial data given to the control circuit of the office line interface unit 2 through the data highway is given from the control circuit to the office line interface circuit, and the office line interface circuit sends the office lines 17a, 1
7b. The downlink data / uplink request data transmission means 7e further performs uplink request data in addition to the above operation,
That is, an upstream data output request signal is transmitted. That is, the downlink data / uplink request data transmitting means 7e
The CPU 13 of the key telephone 10, the CPU 26 of the add-on module 24, and the add-on module 3 are connected through a port to which the key telephone 10 of the key telephone interface unit 4 is connected.
An upstream data output request signal is transmitted to the CPU 66 on the fourth side at predetermined intervals. This uplink data output request signal will be described later in detail.

In addition to performing the various functions described above, the CP
U7 communicates with the control circuit through the data highway,
A plurality of units such as the key telephone set 10 transmit and receive a control signal for capturing a central office line, a control signal for transmitting a dial pulse signal, a signal for notifying the detection of an incoming call signal from the local office lines 17a and 17b, and the like. Key telephone (not shown)
Controls the respective parts of the key telephone device so that the local line call and the extension call can be made.

As is clear from FIG. 1, the key telephone 10 includes a data transmission means 11, a transmission / reception circuit system 12, a CPU 13, and the like. Data transmission means 1
1 includes, for example, a ping-pong transmission data transformer and a ping-pong transmission circuit.

Under the control of the CPU 13 of the key telephone 10, the ping-pong transmission circuit passes the ping-pong transmission data transformer through the key telephone interface unit 4.
Receives serial digital data of a PCM signal (voice signal data) and control data transmitted from the corresponding port by the ping-pong transmission method. And for the PCM signal of the serial digital data,
The output is sent to the transmission / reception circuit system 12, while the control data is sent to the CPU 13 and the CPU 2 of the add-on module 24.
6 and the CPU 66 of the add-on module 34. The ping-pong transmission circuit further includes a PCM signal (voice signal data) output from the transmission / reception circuit system 12 and the CPU 1.
3 or the control data selectively output from one of the CPU 26 of the add-on module 24 and the CPU 66 of the add-on module 34. And
The PCM signal and the control data are converted into serial digital data, and the serial digital data is output to a corresponding port of the key telephone interface unit 4 through a ping-pong transmission data transformer.

The transmission / reception circuit 12 includes a codec, a transmission amplifier, a reception amplifier, a handset transmitter, and a handset receiver. Although illustration of these units constituting the transmission / reception circuit system 12 is omitted,
The configuration of each of these units is as follows.

The codec is the data transmission means 1 described above.
1 receives a PCM signal (voice signal data) output from the ping-pong transmission circuit, converts the PCM signal into an analog signal (received voice signal or the like), and outputs the analog signal to a receiving amplifier. The codec also receives an analog signal (transmitted voice signal or the like) output from the transmitting amplifier, converts the signal into a PCM signal (voice signal data), and outputs the PCM signal to a ping-pong transmission circuit. . The receiving amplifier receives an analog signal (a receiving voice signal or the like) output from the codec, amplifies the signal, and outputs the amplified signal to a handset receiver. The transmission amplifier receives an analog signal (a transmission voice signal or the like) output from a transmitter of the handset, amplifies the signal, and outputs the amplified signal to the codec.

The CPU 13 according to this embodiment has a reference numeral 13a.
It has various functions represented by functional blocks indicated by reference numerals 13g. That is, in the CPU 13, the downlink data receiving means 13a, the downlink data / uplink request analysis means 1
3b, downlink data processing means 13c, key input means 13
d, upstream code creation means 13e, upstream prohibition to ADM /
The permission signal generation means (hereinafter referred to as “uplink prohibition / permission signal generation means”) 13 f and the uplink code transmission means 13 g
It is built by software.

The CPU 13 outputs a logic level signal of a logic level “L” in addition to the above-described functional blocks.
A signal source 13h is applied to the CPU 26 of the add-on module 24 for the number of bits. This signal source 1
3h, the add-on module 24 gives priority to the add-on module 34 when the upstream data output request signal is output from the main device 1 and there is no control data to be sent from the key telephone 10 side, and It is provided to make the CPU 26 recognize that transmission is possible. The signal source 13h will be described later in detail.

The downstream data receiving means 13a gives the control information output from the corresponding port of the key telephone interface unit 4 through the data transmitting means 11 to the key telephone 10, the add-on module 24 and the add-on module 34. Is read as downstream data to be read. The downlink data receiving means 13a converts the read downlink data into downlink data / uplink request analysis means 13b.
To be sent. The above-mentioned control information is C
When the PU 7 outputs a predetermined control signal to the control circuit of the key telephone interface unit 4 through the data highway, the ping-pong transmission circuit corresponding to the key telephone 10 and the ping-pong transmission corresponding to the key telephone 10 are transmitted from the control circuit. The data is transmitted to the data transmission means 11 through the data transformer. That is, the data is supplied from the ping-pong transmission data transformer of the data transmission unit 11 to the downstream data reception unit 13a through the ping-pong transmission circuit of the data transmission unit 11.

The downlink data / uplink request analysis means 13b
By reading the downlink data transmitted from the downlink data receiving means 13a and analyzing the downlink data, the downlink data is converted into a general downlink code (that is, an LED lighting control signal for the LED provided in the key telephone 10 described above). , An LED lighting control signal for lighting an LED built in each key of the add-on module 24 (shown in FIG. 2) or each key of the add-on module 34 (shown in FIG. 3). It is determined whether the signal is a signal notifying that there is a response, or a code requesting uplink data (that is, the above-described uplink data output request signal). As a result of analyzing the uplink data, if it is determined that the received data is a general downlink code, the downlink data / uplink request analysis unit 13b sends the downlink data to the downlink data processing unit 13c. On the other hand, as a result of analyzing the downlink data, if it is determined that the code is a code for requesting uplink data, the downlink data / uplink request analysis means 1
3b transmits an uplink data transmission command signal created based on the downlink data to the uplink code transmitting means 13g.

The downlink data processing means 13c reads the downlink data sent from the downlink data / uplink request analysis means 13b. Then, a signal processing operation based on the read downlink data is performed. The signal processing operation performed by the downlink data processing means 13c based on the downlink data includes, as described above, for example, at the time of an extension call of the key telephone 10,
An LED lighting control signal for lighting an extension key switch LED (not shown) of the key telephone 10 is output to an extension key switch LED drive circuit (not shown). In addition, when the key telephone 10 is in a local line call, an LED lighting control signal for turning on the local key switch LED (not shown) of the key telephone 10 is output to the local key switch LED drive circuit (not shown). And the like.

The normally open contacts 55a to 55x are provided in correspondence with a plurality of keys and buttons (none of which are shown) provided on the keyboard of the main body of the key telephone set 10. When any one of the keys and buttons is pressed, the corresponding normally open contact is closed. Each of the normally open contacts 55a to 55x outputs a predetermined electric signal to the key input means 13d when closed. Key input means 1
3d, when a predetermined electric signal is given from the normally-open contact that is closed by closing any of the normally-open contacts 55a to 55x, the electric signal is received and output to the up-code creating means 13e. Is configured.

The upstream code generating means 13e reads a predetermined electric signal output from the closed normally open contact through the key input means 13d. Then, based on the read electric signal, a code corresponding to the read electric signal (that is, an up code).
From the CPU 13 of the key telephone 10 to the CPU of the main unit 1
7 means various kinds of control data, and this control data includes, for example, a dial signal for calling another key telephone (not shown) during an extension call.
Create The upstream code generating means 13e sends the generated upstream code to the upstream code transmitting means 13g.

The uplink code transmitting means 13g periodically checks whether or not the above-mentioned uplink data transmission command signal has been transmitted from the downlink data / uplink request analysis means 13b. As a result of this periodic check, the uplink code transmission means 13g recognizes that the uplink code has been transmitted from the uplink code creation means 13e, and determines that it is necessary to transmit various control data corresponding to the uplink code. Then, A is sent to the upstream prohibition / permission signal generation means 13f.
A command is issued to output a DM-up prohibition signal. Then, the upstream code provided from the upstream code creating means 13e is read, and the read upstream code is used as the DKT upstream code in the AN provided in the add-on module 24.
Output to the D circuit 25. The DKT uplink code is transmitted from the uplink code transmitting means 13g in the form of serial data and AND
The circuit 25 is provided. At this time, as described later, dummy data (“FFH”) having a logic level “H” is sent from the upstream data transmitting unit 26 a on the add-on module 24 side and the upstream data transmitting unit 66 a on the add-on module 34 side as ADM upstream data. Since the output is output, the various kinds of control data sent from the upstream code transmission means 13g to the AND circuit 25 are supplied from the AND circuit 25 to the data transmission means 11 as they are. on the other hand,
As a result of the above check, when it is determined that the uplink code is not transmitted from the uplink code generator 13e and it is determined that it is not necessary to transmit various control data corresponding to the uplink code, the uplink code transmitter 13g transmits the uplink code. A command is issued to the prohibition / permission signal generating means 13f to output an ADM upstream permission signal. And DKT
An FFH signal (that is, dummy data: a signal of a logic level “H”) is output to the AND circuit 25 as an up code. Thereby, the AND circuit 2
From 5, either the serial data transmitted from the CPU 26 on the add-on module 24 side or the serial data transmitted from the CPU 66 on the add-on module 34 side is supplied to the data transmission unit 11 in the form as it is. When serial data is output as control data from the CPU 26 of the add-on module 24, the C
PU 66 outputs dummy data (“FFH”) of logic level “H” as ADM upstream data. Conversely, when serial data is output as control data from the CPU 66 on the add-on module 34 side, dummy data (“FFH”) of logic level “H” is output from the CPU 26 on the add-on module 24 side as ADM upstream data. Is output.
The above contents will be described later.

The upstream prohibition / permission signal generating means 13f outputs a predetermined ADM upstream prohibition signal and the upstream code transmission means 13g when a command to output an ADM upstream prohibition signal is issued from the upstream code transmitting means 13g. From ADM
When an instruction to output an uplink permission signal is given, a predetermined ADM uplink permission signal is output to the CPU 26 on the add-on module 24 side.

One end of the signal source 13h is a CPU.
26, and the other end comprises two signal lines which are both grounded. This signal source 13
h indicates that, as described above, the add-on module (in this case, the add-on module 24) directly connected to the key telephone 10 is connected to another add-on module (in this case, the add-on module 34) connected to this add-on module. ), The CPU 26 of the add-on module 24 always has the logic level “L” to make it aware that the control data can be transmitted.
Is output for two bits. In the present embodiment, the signal source 13h is configured to output the signal of the logical level "L" for two bits to the CPU 26 of the add-on module 24. The signal source 13h may be constituted by three or more signal lines whose other ends are both grounded so as to output three bits or more. Further, the signal source 13h may be constituted by two or more signal lines both having the other end connected to the positive power supply so as to output the signal of the logic level "H" for two bits or more.
Further, the signal source 13h may be provided with a logic level signal output unit separate from the above configuration. In the present embodiment, the signal source 13h is described as being provided in the CPU 13, but it may be provided in the key telephone 10 outside the CPU 13.

Here, the upstream data output request signal is, as described above, the main unit 1 (ie, the central control circuit 6).
A signal given from the side to the key telephone 10, the add-on module 24 and the add-on module 34 at predetermined intervals, and this signal should output some control data to the key telephone 10, the add-on module 24 and the add-on module 34. Request signal to the effect. In this embodiment, when this upstream data output request signal is given from the main device 1 side, various control data from the CPU 13 side of the key telephone 10 or the CP data of the add-on module 24
The control data sent from the U26 to the main device 1 or the control data sent from the CPU 66 of the add-on module 34 to the main device 1 is selectively sent. The control data from the add-on module 24 and the control data from the add-on module 34 are stored in the RA of the central control circuit 6 as described later.
This is for accessing speed dial data stored in advance in M9 or the like. As is apparent from the above description, in the present embodiment, when an upstream data output request signal is given from the main device 1 through the data transmission means 11, the CPU 13, CPU 26, and CPU 66 need to output control data. If it is recognized that the CPUs 13, 26, and 66 have priority, the priority of control data output from each CPU is determined in advance. Also, various control data output in the form of serial data from the CPU 13 and dummy data respectively output from the CPU 26 and the CPU 66
After the input to the D circuit 25, the AND circuit 25 outputs a predetermined logical level signal (that is, the various control data) as a result of the logical product operation to the data transmission means 11. It will be explained in. Also, control data (key input data) output in the form of serial data from the CPU 26 and the CPU 13
And the dummy data respectively output from the CPU 66 are A
After the input to the ND circuit 25, the AND circuit 25 outputs a predetermined logical level signal (that is, the key input data) as a result of the logical product operation to the data transmission means 11. It will be explained on the side. Further, control data (key input data) output from the CPU 66 in the form of serial data,
After the dummy data respectively output from the PU 13 and the CPU 26 are input to the AND circuit 25, the AND circuit 25
The details of the process of outputting a predetermined logic level signal (ie, the key input data) to the data transmission means 11 as a result of the AND operation will be described on the add-on module 34 side. The key telephone 10 is provided with one add-on module including an add-on module 24 (an add-on module 34 is connected to the add-on module 24).
The configuration is such that the data transmission means 11 and the CPU 13 are connected so that various control data output from the CPU 13 is directly supplied to the data transmission means 11 when no table is connected.

The key telephone 10 has a dial pad, an extension key switch, an extension key switch LED, an office key switch, and an office key in addition to the data transmission means 11, the transmission / reception circuit system 12 and the CPU 13. A switch LED and the like (both not shown) are provided.
The extension key switch is pressed when the speaker of the key telephone 10 wants to make an extension call. When the extension key switch is pressed, a signal indicating that the extension key switch is pressed. Is output to the CPU 13. The office line key switch is pressed when a speaker of the key telephone 10 wants to perform an office line path (external call). When the office line key switch is pressed, the office line key switch is activated. A signal indicating that the pressing operation has been performed is output to the CPU 13. The dial pad sends a dial signal corresponding to a button pressed by a speaker of the key telephone 10 to the CPU 1.
3.

As shown in FIG. 1, the add-on module 24 according to one embodiment of the present invention has an AND circuit 25, a CPU 26, normally open contacts 30a to 30t, and the like. The add-on module 24 according to one embodiment of the present invention also includes a keyboard 30 having a configuration as shown in FIG.

The CPU 26 according to the present embodiment has a reference numeral 26a.
26j are provided. That is, in the CPU 26, the upstream data transmitting unit 26a, the upstream data transmission / prohibition signal receiving unit 26b, the upstream code creating unit 26c, the key input unit 2
6d, downlink data receiving means 26e, downlink data / uplink request analyzing means 26f, downlink data processing means 26g, ADM
The discriminating means 26h, means for generating an upstream prohibition / permission signal to the subsequent ADM (hereinafter referred to as "prohibition / permission signal generating means") 26i, and means for transmitting an ADM discrimination signal 26j are implemented by software.

The downlink data receiving means 26 e receives the control information output from the corresponding port of the key telephone interface unit 4 through the data transmitting means 11,
It is read as downlink data given to the key telephone 10, the add-on module 24 and the add-on module 34. The downlink data receiving unit 26e sends the read downlink data to the downlink data / uplink request analysis unit 26f. The control information described above includes a CPU
7 outputs a predetermined control signal to the control circuit of the key telephone interface unit 4 through the data highway, so that the control circuit transmits the data transmission means 11 through the ping-pong transmission circuit and the ping-pong transmission data transformer corresponding to the key telephone 10. Sent to That is, the control information is provided from the ping-pong transmission data transformer of the data transmission unit 11 to the downstream data reception unit 26e through the ping-pong transmission circuit of the data transmission unit 11.

The downlink data / uplink request analysis means 26f
By reading the downlink data sent from the downlink data receiving means 26e and analyzing the downlink data, the downlink data is converted into a general downlink code (that is, an LED lighting control signal for the LED provided in the key telephone 10 described above). , An LED lighting control signal for lighting an LED built in each key of the add-on module 24 (shown in FIG. 2) or each key of the add-on module 34 (shown in FIG. 3). It is determined whether the signal is a signal notifying that there is a response, or a code requesting uplink data (ie, the above-described uplink data output request signal). As a result of analyzing the uplink data, if it is determined that the code is a general downlink code, the downlink data / uplink request analysis unit 26f sends the downlink data to the downlink data processing unit 26g. On the other hand, if it is determined that the code is a request for upstream data as a result of analyzing the downstream data, the downstream data / upstream request analysis means 26
f transmits an uplink data transmission command signal created based on the downlink data to the uplink data transmitting means 26a.

The downstream data processing unit 26g reads the downstream data sent from the downstream data / uplink request analysis unit 26f. Then, a signal processing operation based on the read downlink data is performed. The signal processing operation performed by the downstream data processing unit 26g based on the downstream data includes, for example, outputting the above-described LED lighting control signal to an LED driving circuit (not shown).

The normally open contacts 30a to 30t are provided in correspondence with the twenty one-touch keys AD1 to AD20 provided on the keyboard 30 shown in FIG. 2, respectively. When any one of the keys is pressed, the corresponding normally-open contact is closed. In the present embodiment, the twenty one-touch keys AD1 to AD20 described above are assigned as one-touch keys for accessing abbreviated dial data stored in advance in the RAM 9 or the like of the central control circuit 6 shown in FIG. Have been. As is clear from the contents already described, each of the one-touch keys AD1 to AD20 has a built-in LED (not shown).
The ED (not shown) is turned on by the LED drive circuit described above. Normally open contacts 30a-30
Each of t outputs a predetermined electric signal to the key input means 26d by closing. When a predetermined electric signal is given from the normally-open contact that is closed by closing any of the normally-open contacts 30a to 30t, the key input means 26d receives the electric signal and sends the signal to the up-code creating means 26c. It is configured to output.

The ADM discriminating means 26h receives a 2-bit logical level signal "00" which is constantly output from the signal source 13h of the key telephone 10 described above. And FIG.
The control data output sequence is determined in accordance with the flowchart shown in FIG. 4 so that the output of the control data from the add-on module (that is, the add-on module 24) has priority over the output of the control data from the add-on module 34. Recognize that That is, since the add-on module 24 is directly connected to the key telephone 10, the input 2-bit logical level signal is “0”.
0 "(steps 201 and 202).
The M determining means 26h recognizes that the output order of the control data of the corresponding add-on module (that is, the add-on module 24) is the first except for the key telephone 10 (step 203). In step 203, the result recognized by the ADM discriminating means 26h is notified to the upstream code creating means 26c and the ADM discriminating signal sending means 26j, and based on this notification, the ADM discriminating signal sending means 26j sends the ADM discriminating signal.
A 2-bit logical level signal "01" is sent to the determination means 66h (step 204).
In the present embodiment, the signal source 13 is set so that the logical level signal "00" for two bits is applied to the ADM discriminating means 26h.
h, the ADM discriminating means 26h is also
A logic level signal for two bits is set to be inputtable.

The upstream code generating means 26c reads a predetermined electrical signal output from the closed normally open contact through the key input means 26d, and reads the ADM discriminating means 26c.
h) to read the order data of the control data output notified from h. Then, based on the read electric signal and data, a code corresponding to the read electric signal and data (that is, an up code as described above).
Here, the upstream code refers to control data given from the CPU 26 of the add-on module 24 to the CPU 7 of the main device 1, and the control data is contained in the above-described predetermined storage area of the RAM 9. Key input data for reading any one of the speed dial data).

In the upstream code generating means 26c, the main unit 1
The main unit 1 can identify from which add-on module the uplink data sent to the device is output (in this embodiment, one of the add-on modules 24 and 34). Except for the above, the control data is set for each of the add-on modules (the add-on module 24 in the present embodiment) in which the output order of the control data is the first and the add-on module (the add-on module 34 in the present embodiment) in the second. The uplink code described above is created using different codes. As apparent from comparison between FIGS. 2 and 3, the add-on modules 24 and 34 have the same keyboard, and also have the same internal circuit configuration as shown in FIG. I have. In this embodiment, the add-on module 24 is ranked first except for the key telephone 10, and the add-on module 34 is ranked second. Therefore, when the speaker or the like presses the one-touch key AD1, the user goes up. The code creating means 26c creates a code (key input data) corresponding to the speed dial data "1". Conversely, when the add-on module 34 is in the first place except for the key telephone 10 and the add-on module 24 is in the second place, when a speaker or the like presses the one-touch key AD1, the up code creating means 26c A code (key input data) corresponding to the speed dial data "21" is created. As described above, even in the case of the same add-on module, the output order of the control data is
Except for the above, even if the same key is pressed between the first and second keys, the up-code generator 26c creates a different code. It is possible to freely set the ranking that has been done. The uplink code creating means 26c sends the created uplink code to the uplink data transmitting means 26a.

Upstream data transmission / prohibition signal receiving means 26b
Receives the signal output from the upstream prohibition / permission signal generating unit 13f and sends it to the upstream data transmitting unit 26a. That is, from the upstream prohibition / permission signal generation means 13f to A
The ADM upstream prohibition signal is supplied when the DM upstream prohibition signal is supplied, and the ADM upstream permission signal is supplied when the ADM upstream permission signal is supplied from the upstream prohibition / permission signal generator 13f. To be sent to the server.

The uplink data transmitting means 26a periodically checks whether or not the above-mentioned uplink data transmission command signal has been transmitted from the downlink data / uplink request analyzing means 26f. As a result of this periodic check, if it is determined that the upstream data transmission command signal has been transmitted from the downstream data / uplink request analysis unit 26f, the upstream data transmission unit 26f
In step a, it is checked whether or not an upstream code (that is, the above-described input data) has been transmitted from the upstream code generation unit 26c. As a result of the check, since the upstream code generation unit 26c recognizes that the upstream code has been transmitted, the control data corresponding to the upstream code (that is, as described above, the main unit 1
When it is determined that it is necessary to send control data for accessing the speed dial data stored in the RAM 9 or the like in advance, the upstream data transmission / inhibition signal receiving means 26b sends the ADM upstream permission signal or the ADM upstream signal. Check which of the inhibit signals is being sent. As a result of this check, when recognizing that the ADM uplink permission signal has been transmitted, the control data corresponding to the read uplink code and the ADM uplink data described above are regarded as ADM uplink data.
Output to the ND circuit 25. The ADM upstream data is transmitted from the upstream data transmitting means 26a in the form of serial data to the AN data.
It is provided to the D circuit 25. Upstream data transmitting means 26a
Also, together with the control data, the CPU 66 of the add-on module 34 instructs the CPU 66 of the add-on module 34 to output an ADM upstream prohibition signal to the upstream prohibition / permission signal generating means 26i. Emit.
At this time, the upstream code transmitting means 1 on the key telephone 10 side.
From 3g, the logic level "H" is used as the DKT uplink code.
Are output as dummy data (“FFH”). On the other hand, since the ADM upstream prohibition signal is output from the upstream prohibition / permission signal generating unit 26i to the upstream data transmission / prohibition signal receiving unit 66b on the add-on module 34 side, the upstream data transmission on the add-on module 34 side is performed. The dummy data (“FFH”) of logic level “H” is also output from the means 66 a as ADM upstream data. Therefore, the ADM transmitted from the upstream data transmitting means 26a to the AND circuit 25 is output from the AND circuit 25.
The upstream data is provided to the data transmission means 11 in the form as it is.

On the other hand, when recognizing that the ADM upstream prohibition signal has been transmitted from the upstream data transmission / prohibition signal receiving section 26b, the upstream data transmitting section 26a transmits the above upstream code from the upstream code generating section 26c. Regardless of whether or not the dummy data (“FFH”) of logic level “H” is the ADM upstream data,
The data is output to the D circuit 25. At the same time, dummy data (“FFH”) of logic level “H” is output from the add-on module 34 as ADM upstream data.
The uplink data transmitting means 26a issues a command to the ND circuit 25 to output an ADM uplink prohibition signal to the uplink prohibition / permission signal generating means 26i.

The upstream prohibition / permission signal generating means 26i outputs a predetermined ADM upstream prohibition signal and the upstream data transmission From ADM
When a command to output an uplink permission signal is issued, a predetermined ADM uplink permission signal is output to the CPU 66 on the add-on module 34 side.

The above-mentioned ADM discrimination signal transmitting means 26j
Always outputs a 2-bit logical level signal “10” to the CPU 66 of the add-on module 34 based on the recognition result of the output order of the control data excluding the key telephone 10 notified from the ADM determination means 26h. It is configured to output. ADM discrimination signal sending means 26
j always outputs a 2-bit logic level signal “10”, so that the key telephone 1 can be switched through another add-on module (in this case, the add-on module 24).
0 of the add-on module (in this case, the add-on module 34) connected to the CPU (in this case, the CPU 6).
6) recognizes that it is possible to send its own control data next to the other add-on module (in this case, add-on module 24).

In this embodiment, the add-on module 3
The ADM discriminating signal transmitting means 26j is configured to always transmit the 2-bit logical level signal "10" to the CPU 66 of No. 4, but the 2-bit logical level signals "01" and "11" are set. ADM to always send "
The determination signal sending means 26j may be configured.
Also, the ADM discrimination signal transmitting means 26j may be configured to always transmit a logical level signal of 3 bits or more. In the present embodiment, the ADM discrimination signal transmitting means 26j is constructed by software in the CPU 26, but may be provided as hardware in the add-on module 24 outside the CPU 26.

The AND circuit 25 outputs a logical level signal (that is, the above-mentioned DKT uplink code) output from the upstream code transmitting unit 13g of the key telephone 10 and an output from the upstream data transmitting unit 26a of the add-on module 24. And the logical level signal (A) output from the upstream data transmitting means 66a of the add-on module 34.
DM upstream data) and performs a logical AND operation of these three logical level signals. Then, the result of the AND operation is output to the data transmission means 11 of the key telephone 10 as a logical level signal. For example,
When key input data is transmitted as ADM upstream data from the upstream data transmitting unit 26a to the input terminal of the AND circuit 25, the logical level is output as dummy data from the upstream code transmitting unit 13g to another input terminal of the AND circuit 25. An "H" signal ("FFH") and a logic level "H" signal ("FFH") as dummy data are output from the upstream data transmission means 66a to still another input terminal of the AND circuit 25. to continue. Therefore, in this case, the key input data transmitted from the upstream data transmission unit 26a is output from the AND circuit 25 to the data transmission unit 11.

On the other hand, when various control data is transmitted as uplink data from the uplink code transmitting means 13g of the key telephone 10 to another input terminal of the AND circuit 25, the uplink data transmitting means 26a transmits the AND circuit 2
5, a signal of logic level "H"("FFH") is provided as dummy data to the input terminal No. 5 and dummy data is also provided to the other input terminal of the AND circuit 25 from the upstream data transmitting means 66a. The signal of the level “H” (“FFH”) is continuously output. Therefore, in this case, various control data transmitted from the uplink code transmission unit 13g is output from the AND circuit 25 to the data transmission unit 11.

Further, when another key input data other than the above is transmitted as ADM upstream data from the upstream data transmitting means 66a of the add-on module 34 to the further input terminal of the AND circuit 25, the upstream code transmission is performed. A signal of logic level “H” (“FF”) as dummy data from another means 13g to another input terminal of the AND circuit 25
H ”), a signal of logic level“ H ”(“ FFH ”) continues to be output as dummy data from the upstream data transmission means 26a to the input terminal of the AND circuit 25. In this case, the AND circuit The key input data transmitted from the upstream data transmitting means 66a is output to the data transmitting means 11 from 25. The add-on module 34 according to one embodiment of the present invention includes the contents described above and FIG. As is apparent with reference to the CPU
66 and normally open contacts 75a to 75x. Further, the add-on module 34 according to the embodiment of the present invention includes a keyboard 7 having a configuration as shown in FIG.
5 is also provided.

The CPU 66 according to the present embodiment has various functions represented by functional blocks denoted by reference numerals 66a to 66j, like the CPU 26 in the add-on module 24 described above. That is, in the CPU 66, the upstream data transmitting unit 66a, the upstream data sending / prohibiting signal receiving unit 66b, the upstream code creating unit 66c, the key input unit 66d, the downstream data receiving unit 66e, the downstream data / upward request analyzing unit 66f, Downlink data processing means 66
g, ADM discriminating means 66h, prohibiting uplink to subsequent ADM /
Permission signal generating means (hereinafter referred to as "uplink prohibition / permission signal generating means") 66i and ADM discrimination signal transmitting means 66j
Is constructed by software. CP mentioned above
The components constituting the U66 perform the same functions as the components constituting the CPU 26, respectively.

The ADM discriminating means 66h is a 2-bit logical level signal "10" always output from the ADM discriminating signal transmitting means 26j on the add-on module 34 side.
Receive. Then, it recognizes that the output order of the control data from its own add-on module (ie, add-on module 34) is determined next to the control data output from the add-on module 24 according to the flowchart shown in FIG. . That is, the add-on module 34
Is connected to the add-on module 24, the input 2-bit logical level signal is "01" (steps 201 and 202). Accordingly, the ADM discriminating means 66h recognizes that the output order of the control data of the corresponding add-on module (that is, the add-on module 34) is the second except for the key telephone 10 (step 2).
05). If another add-on module is connected to the add-on module 34, the ADM
The result recognized by the discriminating means 66h is notified to the ADM discriminating signal sending means 66j, and based on this notification, the ADM discriminating signal sending means 66j sends a 2-bit logical level signal to the CPU of another add-on module. “1
0 "is transmitted (step 206). As is apparent from FIG. 1, in this embodiment, the output order of the control data is higher in the add-on module 34 than in the add-on module 34. Since the lower order add-on module is not connected, the ADM discrimination signal transmitting means 6
6j does not receive the recognition result output from the ADM discriminating means 66h.

In the present embodiment, the ADM discrimination signal sending means 26j is configured so that the logical level signal "10" of 2 bits is applied to the ADM discrimination means 66h. A logic level signal for two bits is set to be inputtable.

The up code creating means 66c reads a predetermined electric signal output from the normally open contacts 75a to 75x through the key input means 66d and is notified from the ADM discriminating means 66h. The order data of the control data output is read. Then, based on the read electrical signal and data, a code corresponding to the read electrical signal and data (that is, an upstream code as described above. Here, the upstream code is
Control data given from the CPU 66 of the add-on module 34 to the CPU 7 of the main device 1,
The control data includes key input data for reading any one of the speed dial data stored in the predetermined storage area of the RAM 9 described above.

As apparent from the contents already described, the upstream code generating means 66c determines from which add-on module the upstream data to be transmitted to the main unit 1 is output (in this embodiment, the add-on module 24 ,
34 is an add-on module in which the output order of the control data is previously set to the first except for the key telephone 10 so that the main device 1 can identify the add-on module (in this embodiment,
The above-described upstream code is created using a different code set for each of the add-on module 24) and the second add-on module (in this embodiment, the add-on module 34).

The normally open contacts 75a to 75x are provided in correspondence with the twenty one-touch keys AD21 to AD40 provided on the keyboard 75 shown in FIG. 3, respectively. When any one of the keys is pressed, the corresponding normally-open contact is closed. In the present embodiment, the twenty one-touch keys AD21 to AD40 described above are assigned as one-touch keys for accessing the speed dial data stored in advance in the RAM 9 or the like of the central control circuit 6 shown in FIG. Have been. As is clear from the contents already described, each of the one-touch keys AD21 to AD40 has a built-in LED (not shown), and these LEDs (not shown) are turned on by the above-described LED drive circuit. It has become. Normally open contact 75a
Each of .about.75x outputs a predetermined electric signal to the key input means 66d when closed. The key input means 66d receives a predetermined electric signal from the normally-open contact that has been closed by closing one of the normally-open contacts 75a to 75x, and receives the electric signal to send the upward code to the upward code creating means 66c. It is configured to output.

In this embodiment, as described above, the add-on module 34 is not connected to an add-on module whose control data output order is lower than that of the add-on module 34. Therefore, the upstream data transmitting means 66
From a, neither a command to output an ADM upstream prohibition signal nor a command to output an ADM upstream permission signal to the upstream prohibition / permission signal generating means 66i is issued.
Further, for the same reason as described above, the ADM discrimination signal transmitting means 66j also does not output a logic level signal having the same function as that output from the ADM discrimination signal transmitting means 26j.

On the other hand, when another add-on module is connected to the add-on module 34,
Either a command to output an ADM upstream prohibition signal or a command to output an ADM upstream permission signal is issued from the upstream data transmission unit 66a to the upstream prohibition / permission signal generation unit 66i. Therefore, the upstream prohibition / permission signal generating means 66i is provided with the CPU of the another add-on module.
In this case, one of the ADM upstream prohibition signal and the ADM upstream permission signal is transmitted. The ADM discriminating signal sending means 66j always sends two bits for the CPU of the other add-on module based on the recognition result regarding the output order of the control data excluding the key telephone 10 notified from the ADM discriminating means 66h. Is output as the logical level signal “01”. Thereby, another add-on module (in this case, add-on modules 23 and 3)
The CPU of the add-on module connected to the key telephone 10 through 4) makes it possible to recognize that control data can be transmitted next to the add-on module 34.

In this embodiment, the add-on module 3
The ADM discrimination signal transmitting means 66j is configured to always transmit the 2-bit logical level signal “01” to the CPU 66 of the fourth CPU 66. The ADM discrimination signal transmitting means 66j may be constituted. In the present embodiment, the ADM discrimination signal transmitting means 66j is constructed by software in the CPU 66, but may be provided as hardware in the add-on module 34 outside the CPU 66.

Next, control data exchange between the key telephone 10, the add-on module 24 and the add-on module 34, and the main unit 1 will be described with reference to timing charts shown in FIGS.
FIG. 6 is a flowchart on the CPU 13 side shown in FIG.
This will be described mainly with reference to the flowcharts on the side of the CPU 26 and the CPU 66 shown in FIG. In the following description, it is assumed that the key telephone 10 is in a state in which the telephone line can perform office line communication, that is, a state in which the key telephone 10 is capturing office lines 17a and 17b through the main device 1.

In FIG. 1, when control data is output from the central control circuit 6 to the key telephone 10, the control data is transmitted to the key telephone interface unit 4 through the data highway. The control data is transmitted from the key telephone interface unit 4,
It is organized into one frame of serial data together with the PCM signal (audio signal data) transmitted from the time switch 3 (see FIG. 4A). One frame of serial data in the state shown in FIG. 4A is transmitted from the key telephone interface unit 4 to the data transmission means 11 of the key telephone 10. The serial data described above is separated by the data transmission means 11 into a PCM signal (audio signal data) and control data. The PCM signal (voice signal data) is transmitted from the data transmission means 11 to the transmission / reception circuit system 12, while the control data is transmitted from the data transmission means 11 to the CPU 13, the CPU 26 and the CPU 6.
6 is sent. In CPU13 side of downlink data / uplink request analysis unit 13b, CPU 26 side of the downstream data / uplink request analysis unit 26f and the CPU66 side of downlink data / uplink request analysis unit 66f time t _1, during the control data, an uplink data output It is detected that the request signal is included (FIG. 4A) (FIG. 6A, step 101),
(See step 111 in FIG. 6B). Here, when the upstream code transmitting unit 13g determines that it is necessary to transmit various control data from the key telephone 10 side to the main device 1 side by receiving the above upstream code from the upstream code generating unit 13e. (FIG. 6 (A) Step 1
02, step 103), the upstream prohibition / permission signal generating means 13f transmits an ADM upstream prohibition signal of logic level "H" to the upstream data transmission / prohibition signal receiving means 26b. The ADM upstream prohibition signal is transmitted from the upstream prohibition / permission signal generator 13f to the upstream data transmission / prohibition signal receiver 26.
b, the upstream data transmission / prohibition signal receiving unit 6 also transmits from the upstream prohibition / permission signal generation unit 26i.
An ADM upstream prohibition signal having a logic level "H" is transmitted to the second ADM 6b (FIGS. 4C, 4D, and 6).
(A) Step 104).

On the other hand, since the uplink data transmitting means 26a is given the above-mentioned uplink code from the uplink code creating means 26c, it is necessary to transmit various control data from the add-on module 24 to the main device 1. When it is determined (steps 112 and 113 in FIG. 6B), an ADM upstream prohibition signal of logic level "H" is transmitted from the upstream prohibition / permission signal generating means 13f to the upstream data transmission / prohibition signal receiving means 26b. It is checked whether or not it has been performed (steps 114 and 115 in FIG. 6B). When the ADM upstream inhibition signal of the logic level “H” is output from the upstream inhibition / permission signal generating unit 13f to the upstream data transmission / inhibition signal receiving unit 26b, the upstream data transmission / inhibition signal receiving unit 26b
Since the ADM uplink prohibition signal of the logical level “H” is continuously output to the uplink data transmitting unit 26a (step 117 in FIG. 6B), the uplink data transmitting unit 26a
Is a signal of logic level “H” as ADM upstream data based on the ADM upstream prohibition signal (ie, dummy data: “F”).
FH ") is sent to the input terminal of the AND circuit 25.
Similarly, the upstream data transmitting unit 66a also sends a signal of the logical level “H” (ie, dummy data: “FFH”) to the further input terminal of the AND circuit 25 as ADM upstream data. In other words, the upstream code generating means 26
c, the upstream data transmitting means 26a transmits the upstream code to the
It is not output to the input terminal of the AND circuit 25 as M-up data (see FIG. 4E). Similarly, even if the above-described upstream code is transmitted from the upstream code generation unit 66c, the upstream data transmission unit 66a uses the transmitted upstream code as ADM upstream data to another input terminal of the AND circuit 25. No output (see FIG. 4 (f)). Therefore,
When various control data is output from the upstream code transmission means 13g to another input terminal of the AND circuit 25, the various control data is supplied to the main device 1 through the data transmission means 11 as an output from the AND circuit 25. (FIG. 4B) (see step 105 in FIG. 6A).

[0096] On the other hand CPU13 side of downlink data / uplink request analysis unit 13b is at time t _2, the data transmission means 1
When the control data sent from the control unit 1 detects that the upstream data output request signal is included in the control data, and the upstream code transmission unit 13g does not receive the upstream code from the upstream code generation unit 13e, the button is pressed. Telephone 1
When it is determined that there is no need to send various types of control data from the 0 side to the main apparatus 1 side (step 10 in FIG.
3), the upstream prohibition / permission signal generating means 13f continues to output the ADM upstream permission signal of the logic level "L" to the upstream data transmission / prohibition signal receiving means 26b (FIG. 4C). (See step 106 in FIG. 6A).
Thereby, the upstream data transmission / prohibition signal receiving means 26b
Will continue to output the ADM uplink permission signal of the logic level "L" to the uplink data transmitting means 26a (step 116 in FIG. 6B). In this state, any of the one-touch keys AD1 to AD20 described above is
When the key input data corresponding to the pressing operation is given in the form of serial data from the upstream code creating unit 26c to the upstream data transmitting unit 26a due to the pressing operation by the speaker or the like, the upstream data transmitting unit 26a
The upstream code from the upstream code generation means 26c is sent to the input terminal of the AND circuit 25 as ADM upstream data based on the upstream permission signal. At the same time, the upstream data transmitting unit 26a
In order to prohibit the output of the ADM uplink data to the ADM 66, a command is issued to the uplink prohibition / permission signal generating means 26i to output the ADM uplink prohibition signal (FIG. 4D).
On the other hand, the upstream code transmitting unit 13g outputs a signal of the logical level “H” as the DKT upstream code (that is, the dummy data:
"FFH") is sent to another input terminal of the AND circuit 25 (FIG. 4B). Similarly, the upstream data transmitting unit 66a also transmits a signal of the logic level “H” (ie, dummy data: “FFH”) to the further input terminal of the AND circuit 25 as ADM upstream data (FIG. f)),
(Step 107 in FIG. 6A).

Therefore, the upstream data transmitting means 26a
The ADM upstream data transmitted to the input terminal of the ND circuit 25 is directly supplied to the main device 1 through the data transmission means 11 as an output from the AND circuit 25 (FIG. 4E).

At step 116 (time t _{3 in} FIG. 4), if none of the above-mentioned one-touch keys AD1 to AD20 is pressed by a speaker or the like, the upstream code creating means 26c sends the upstream data transmitting means 26a. No key input data is given. Therefore, the upstream data transmitting unit 26a transmits the signal of the logical level “H” (that is, dummy data: “FFH”) as the ADM upstream data to A
The signal is transmitted to the input terminal of the ND circuit 25 (FIG. 4E). At the same time, the upstream data transmission unit 26a transmits the upstream prohibition / permission signal generation unit 26 to permit the CPU 66 on the add-on module 34 side to output the ADM upstream data.
A command is issued to output an ADM upstream permission signal to i (FIG. 4D). At this time, the upstream code transmission unit 13g transmits a signal of the logical level “H” (ie, dummy data: “FFH”) as the DKT upstream code to the AND circuit 2
5 to another input terminal (FIG. 4 (b)). In this state, the one-touch keys AD21 to AD21
40 is pressed by a speaker or the like, and when key input data corresponding to this pressing operation is given in the form of serial data from the upstream code creating unit 66c to the upstream data transmitting unit 66a, the upstream data is transmitted. The transmitting means 66a transmits the ADM upstream permission signal (FIG. 4C,
Based on (d)), the upstream code from the upstream code generation means 66c is used as the ADM upstream data, and the AND circuit 25
To another input terminal.

Therefore, the upstream data transmitting means 66a sends A
The ADM upstream data sent to yet another input terminal of the ND circuit 25 is directly provided to the main device 1 through the data transmission means 11 as an output from the AND circuit 25 (FIG. 4 (f)).

FIG. 5 shows the upstream prohibition / permission signal generating means 13.
f gives an ADM upstream permission signal to the upstream data transmission / prohibition signal receiving means 26b, the upstream prohibition / permission signal generation means 26i provides an ADM upstream prohibition signal to the upstream data transmission / prohibition signal receiving means 66b, and 9 is a timing chart showing a mode of an AND operation performed by the AND circuit 25 when the code transmission unit 13g outputs a signal of a logical level “H” (“FFH”) as dummy data to the AND circuit 25. FIG. 5A shows dummy data output from the uplink code transmitting means 13g. In the dummy data, the start bit and the stop bit are at the logical level “L”, and eight bits (b ₀ , b ₁ , b) between the start bit and the stop bit are provided.
₂ , b ₃ , b ₄ , b ₅ , b ₆ , b ₇ ) are signals of the logic level “H”. FIG. 5 (B), shows the key input data outputted from the uplink data transmitting unit 26a, the key input data, a start bit and stop bit, b _1-bit and b ₅ bits and the logic level " L "and b ₀ , b ₂ , b ₃ , b ₄ , b ₆ , b ₇
Are the signals of the logic level "H". FIG. 5C shows a logical level signal output from the AND circuit 25.
This is the result of the AND operation between the dummy data shown in FIG. 5A and the key input data shown in FIG. 5B performed in the ND circuit 25. As is clear from the content already described, since dummy data is output from the upstream code transmitting means 13g, the AND shown in FIG.
The output signal from the circuit 25 is transmitted to the upstream data transmitting unit 26a.
Is the same as the key input data output from.

As described above, the key input data described above is used as a logical level signal as shown in FIG.
When output from the ND circuit 25, the key input data is transmitted to the central control circuit 6 through the data transmission means 11, the key telephone interface unit 4, and the data highway.
Sent to When the key input data is given to the central control circuit 6, the down data / up request data transmitting means 7e of the CPU 7 corresponds to the key input data from the shortened dial data stored in advance in the storage area of the RAM 9. Read the speed dial data of the address. The shortened dial data read by the downlink data / uplink request data transmitting means 7e is transmitted to the station line 17 through the data highway and the station line interface unit 2.
a and 17b (see FIG. 8). In addition, the upstream data transmitting unit 26a and the upstream data transmitting unit 6
The dummy data output as the ADM upstream data from 6a also has the same data configuration as the dummy data shown in FIG.

As described above, according to one embodiment of the present invention, the upstream data transmission / prohibition signal receiving means 26
b, the transmission of the control data from the uplink code transmission means 13g of the key telephone 10 can be given priority over the transmission of the control data output from the uplink data transmission means 26a by the uplink data transmission means 26a and the AND circuit 25. The add-on modules 24, 34
Not only can the number of components of the circuit constituting the conventional add-on module 14 shown in FIG. 9 be significantly reduced, but also A number (two in this embodiment) of add-on modules 24 and 34 can be connected without reducing the number of key telephones connected to each port such as 5 and so on.
0 function can be greatly enhanced.

In this embodiment, the configuration in which two add-on modules are connected to one key telephone is described. However, by changing the configuration of the signal source and the ADM discriminating means, one key telephone can be controlled. Of course, it is also possible to connect three or more add-on modules.

[0104]

As described in detail above, according to the present invention, a plurality of additional devices are cascaded to at least one of the telephones, and control data generating means is provided in each of the additional devices.
The data transmission prohibition / permission signal transmission means and the priority setting means are provided, and the control data generated based on the priority set by the priority setting means is transmitted to the main device. Can be reduced as compared with the related art, and a plurality of additional devices can be connected without reducing the number of telephones connected to the ports of the telephone interface unit. Therefore, the function of the telephone can be greatly enhanced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an overall configuration of a key telephone apparatus to which an embodiment of the present invention is applied.

FIG. 2 is a view illustrating a keyboard included in an add-on module according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating a keyboard included in an add-on module according to an embodiment of the present invention.

FIG. 4 is a timing chart showing an aspect of transmission and reception of various signals according to the key telephone apparatus according to the embodiment of the present invention.

FIG. 5 is a timing chart showing a mode of transmitting and receiving various signals according to the key telephone apparatus according to the embodiment of the present invention.

FIG. 6 shows a keypad-side CP according to an embodiment of the present invention.
7 is a flowchart showing a control operation of U and a flowchart showing a control operation of a CPU of the add-on module according to an embodiment of the present invention.

FIG. 7 is a flowchart when the CPU of the add-on module according to the embodiment of the present invention recognizes the output order of the control data of the corresponding add-on module.

FIG. 8 is an operation explanatory view of the key telephone apparatus according to the embodiment of the present invention;

FIG. 9 is a block diagram showing the overall configuration of a conventional key telephone device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main apparatus 10 key telephone 13 CPU 13h Signal source 17a Office line 17b Office line 25 AND circuit 26 CPU 26a Up data transmission means 26b Up data transmission / prohibition signal reception means 26c Up code creation means 26e Down data reception means 26f Down data / Ascending request analyzing means 26h ADM discriminating means 26i Ascending prohibition / permission signal generating means 26j ADM discriminating signal sending means 30a-30t normally open contacts 55a-55x normally open contacts 66 CPU 66a ascending data transmitting means 66b ascending data sending / prohibiting signal receiving means 66c Uplink code creation unit 66e Downlink data reception unit 66f Downlink data / uplink request analysis unit 66h ADM discrimination unit 66i Uplink prohibition / permission signal generation unit 66j ADM discrimination signal transmission unit 75a to 75x normally open contacts

Claims (4)

(57) [Claims] At least one telephone for transmitting control data in accordance with a key operation, and a main unit for exchanging connection between said telephones or between a central office and said telephone based on said control data transmitted from said telephone. A plurality of additional devices are connected in cascade to at least one of the telephones, and each of the additional devices has control data generating means for generating control data to be transmitted to the main device. Data transmission prohibition / permission signal transmission means for transmitting a data transmission prohibition / permission signal for instructing output permission or output prohibition of the control data generated by the control data generation means to a subsequent additional device; Based on the data transmission prohibition / permission signal transmitted from the preceding additional device or the telephone, the control data generation means Priority setting means for setting a priority for transmitting the generated control data to the main device, wherein the data transmission prohibition / permission signal transmitting means is provided in a subsequent stage based on the set priority. A telephone exchange device for generating the data transmission prohibition / permission signal to be transmitted to the additional device. 2. The data transmission prohibition / permission signal is composed of a predetermined number of bit strings of 2 bits or more, and the data transmission prohibition / permission signal transmitting means corresponds to a priority set by the priority setting means. 2. The telephone exchange according to claim 1, wherein said data transmission prohibition / permission signal comprising a bit value is transmitted to an additional device at a subsequent stage. 3. The control data generating means according to claim 1, wherein said control data generating means generates said control data in accordance with said priority set by said priority setting means.
A telephone exchange device according to claim 1. 4. The telephone exchange according to claim 3, wherein said control data generating means changes the code information of said control data when said priority is changed.