JPS5928318B2 - Distributed control button telephone - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a button telephone in a button telephone device.

A predetermined number of office lines and a predetermined number of key telephones are housed in one main device, and calls can be controlled between the housed key telephones or between any key telephone and any office line. A button telephone device is known.

Such conventional key telephone devices generally consist of one key telephone main device and a plurality of key telephone devices, and control functions are centralized in the key telephone main device. Therefore, the key telephone main unit was required to have advanced control functions, and its configuration was complicated. Moreover, the number of key telephone main devices produced was small compared to the number of key telephones, and the economical effects of mass production could not be expected, so the key telephone main devices were expensive. Furthermore, since the control functions required of the key telephone main device are almost the same depending on the number of key telephones accommodated in the system, especially in small-scale key telephone devices, the cost of the main device is not included in the system price. This accounted for a large proportion of the market, and this was hindering the price reduction of small-scale systems. Furthermore, since it is a centralized control system, if a failure occurs in the main unit, it will affect all key telephones, so the main unit must have extremely high reliability. Furthermore, the number of key telephones that can be accommodated in the system is limited by the capacity of the circuit that can be mounted on the main device. Furthermore, since the main device has a considerably larger volume than a key telephone, a special place must be prepared for it. On the other hand, there have been key telephone devices that do not use a main device, but these employ a system in which a small main device is built into a specific button telephone device, and other key telephone devices are centrally controlled by this device. Therefore, it had essentially the same drawbacks as the above case. Furthermore, in conventional button telephone devices, the main device uses separate control lines for controlling each button telephone, corresponding to the buttons and lamps of the button telephone. As a result, the number of cable cores required for wiring increases, and the price of the cable increases. Another disadvantage was that the construction work required for installation and modification was complicated. This invention was made in order to solve the various drawbacks of the conventional key telephone device as described above, and therefore, an object of the present invention is to distribute the control functions to each button telephone device, thereby improving the main function of the key telephone device. An object of the present invention is to provide a distributed button telephone set which allows a key telephone device to be configured without requiring any equipment.

The key point of the configuration of the present invention is that a key telephone set accommodates a central office line, an extension call line, and a control line that are to be connected in parallel to other similar key telephone sets, and
a data transmitting/receiving circuit for transmitting and receiving various data necessary for communication with other key telephones via the control line; a memory for storing availability of extension telephone lines; a telephone line switch; a telephone circuit; and a control circuit. The control circuit receives the extension number designation information and the other party's telephone designation information from a user who wishes to make a call to another similar key telephone via the extension telephone line, and based on that, the control circuit connects the extension telephone line. After confirming the availability of the extension using the memory, the data transmission/reception circuit transmits/receives various data necessary for mutual communication with the other party's key telephone via the control line, and finally connects the extension line. The main feature is that it is possible to talk to the other party's button telephone by connecting to the telephone circuit using a telephone line switch. Next, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing a connection method between key telephones according to the present invention.

In the figure, CO-1 to CO-k are central office lines or PBX extensions drawn from the telephone office, and INT-1 to 1NT-1.
is an extension communication line used for communication between extensions, PWL is a power supply line, and CL is a control line. By connecting multiple key telephones KT-1 to KT-m in parallel to these lines and further connecting the power supply line PWL to the power supply circuit PW,
Configure a button telephone device. The power supply circuit PW is connected to the power supply line P
Power is supplied through WL to operate various circuits in each button telephone set KT-1 to KT-m. Please refer to FIG.

The button telephone according to the present invention (for example, KT-1) can communicate with other similar button telephones (KT-1 to KT-m) via extension telephone lines (INT-1 to 1NT-l), and therefore Data regarding each button telephone set required for this purpose is transmitted and received via the control line CL.

That is, any number of button telephones according to the present invention can be interconnected as shown in FIG.
In the conventional key telephone device, it is possible to construct a key telephone device that does not require a main device. FIG. 2 is a block diagram showing one embodiment of the present invention.

In other words, it is a block diagram showing the configuration of an arbitrary key telephone set in FIG. 1. In the figure, SW-1 is a communication path switch, which includes office lines CO-1 to CO-k and extension communication lines 1NT-1 to 1NT-! Connect or disconnect any one or more of the lines and the telephone circuit NW-1. This communication path switch SW-1 is a control circuit CC-1.
1 and is driven by a switch drive circuit SWD-1. COIF-1 is a central office line interface circuit that detects incoming signals from the central office line. When the office line interface circuit COIF-i detects an incoming signal, it sends information identifying the office line number where the incoming call was received to the control circuit CO-1. KEY-J-1 to KEY-1-p are buttons consisting of line buttons for selecting the central office line or extension line used for calls, and function buttons operated for using special functions such as hold. It is an array.

Further, HS-1 is a switch and D-1 is a push button dial. Button arrangement KEY-1-1 to KEY-
When the i-p1 switch HS-1 and the pushbutton dial D-1 are operated, their signals are input to the control circuit CC-1 via the button information input circuit KIF-1.
LMP-1-1 to LMP-1-q are lamps for displaying the usage status of lines and special functions, and are driven by a lamp drive circuit LD-i under the control of a control circuit CC-1. 0SC-1 is an oscillation circuit that generates various signal tones necessary in connection with call connection operations.

Typical signal tones include dial tone, busy tone, ring tone, and bell signal. These tones are sent to telephone circuit NW-1 or amplifier AMP-1. The signal tone sent to telephone circuit NW-i is
You can listen to it through ND-1. Also, the amplifier AM
The signal tone sent to P-1 can be heard in an amplified state through speaker SP-1. HLD-1 is a hold circuit,
When the function button KEY-1-k for holding is pressed during a call, the line being called is put into a loop state and a hold tone is sent to it. T-1 is a button telephone KT-
1 is a data transmission circuit for sending data necessary for communication with other key telephones to a control line CL. The timing of data transmission is determined by the timing detection circuit TD-1. R-1 is a data receiving circuit that constantly monitors the control line CL, reads data appearing on the control line CL, and transmits it to the control circuit CC-1. Control circuit CC-1
is button information input circuit KIF-11 data reception circuit R
-11 The communication path switch SW-11 lamp L receives the signal from the station line interface circuit COIF-1, etc.
It drives MP-1-1 to LMP-1-q and controls data transmission. Control circuit C with such functions
C-1 can be realized by either the wired logic method or the storage program control method. Each key telephone KT-1 transmits and receives data to and from other key telephones by using the control line CL in a time-sharing manner in order to perform operations across a plurality of key telephones, such as calling each other.

FIG. 3 shows an example of the structure of data DATA-1 sent by the button telephone KT-1. In the figure, ST is a signal indicating the start of data, DST is information specifying the key telephone that should receive the data, 0RG is identification information of the key telephone that sent the data, LN is information on the line number used for the call, and SST is information specifying the key telephone that should receive the data. Sent button phone status information, END
is a signal indicating the end of data. Each button telephone K
FIG. 4 shows an example of the timing at which data DATA-1 sent by T-1 appears on the control line CL. At this time, it is assumed that all key telephones KT-1 to KT-m have been ordered in advance for data transmission. Various methods can be used for this, but one example is a small switch built into a button telephone. In the following description, it is assumed that the key telephone KT-1 is placed first. In order for each key telephone KT-1 to transmit data DATA-1 in a predetermined order as shown in FIG. 4, each key telephone KT-1 must adjust its own data transmission timing. need to be identified.

This function is realized by the timing detection circuit TD-1 in FIG. An example of a specific configuration of the timing detection circuit TD-1 is shown in FIG. In FIG. 5, SSW-
1 is a small switch for setting the data sending order, I
D-1 is a vacant time detection circuit for detecting that no data appears on the control line CL, CT-1 is a counting circuit, and E
D-1 is an END signal detection circuit.

The operation of this will be explained below. Free time detection circuit 1D-1
is connected to the data receiving circuit R-1, and the control line C
The state of L is input. When this circuit detects that no data appears on the control line CL for a certain period of time, that is, when a no-signal state is detected after the DATA-m in FIG. Information on the ranked order, for example "101", is set in the counting circuit CT-i. The END signal detection circuit ED-1 is also connected to the data reception circuit R-1, and the END signal detection circuit ED-1 is connected to the data reception circuit R-1.
Detect D signal. This circuit sends a signal to the counting circuit CT-1 every time it detects the END signal. Counting circuit CT
-1, each time the signal from the END signal detection circuit ED-1 is received, l is subtracted from its contents. The result of subtraction is
When the content becomes "001", the counting number CTi is counted by the data transmitting circuit T after a predetermined time margin.
-1 to start data transmission from the data transmitting circuit T-1. According to the data transmission timing allocation method explained above, the control line C is
After no data appears on L, data is sent from the data transmitting circuit T-1 in the order set by the small switch SSW-1, as shown in FIG. This makes it possible to send data at the same timing. The button turtle KT-m in the last rank is the data DAT.
After sending out A-m, no data appears on the control line CL for a while. This state is the free time detection circuit 1
By being detected by D-1, the above operation is repeatedly executed. In addition to the method described above, each timing detection circuit TD-1 extracts the transmitting telephone information 0RG from the data on the control line CL, and Various other methods are possible, such as a method in which data transmission is started when the data is the first one in the ranking assigned to the data.

As an example of the operation of a button telephone device constructed by connecting an arbitrary number of button telephones according to the present invention, a button telephone K
An example of the operation when T-1 calls the key telephone KT-m to make an extension call will be described.

The user uses the handset H on the button telephone KT-1.
Raise ND-1 and use extension line 1NT-1 for calls.
When you specify by pressing line button KEY-1-1,
Signals of state changes of the switch HS-1 and the line button KEY-1-1 are transmitted to the control circuit CC-1 through the button information input circuit KIF-1.

When control circuit CC-1 receives this signal, it connects extension line 1.
Make sure that NT-1 is not in use and seize its line. Next, the lamp LMP-1-1 corresponding to the line button KEY-1-1 is turned on to cause the telephone circuit NW-1 to send out a dial tone from the oscillation circuit 0SC-1. Furthermore, the telephone line number used for the telephone call is sent to the data transmitting circuit T-1. The data transmitting circuit T-1 transmits this information according to the sending timing signal from the timing detecting circuit TD-1.
It is sent to the control line CL as data DATA-1. K
Data receiving circuit R of button telephone KT-j other than T-1
-j, upon receiving data DATA-1, transmits this information to control circuit CC-J. The control circuit CC-j decodes this information and stores that the extension line 1NT-1 has become unusable. In the key telephone KT-1, when the user specifies the other party's key telephone KT-m from the dial D-1, the control circuit CC-1 stops sending out the dial tone,
Information specifying the key telephone KT-m is sent to the data transmitting circuit T-1. The data transmitting circuit T-1 transmits the data DATA-1 at its own transmitting timing as before. In the button telephone KT-m, this data DATA-1
When receiving the control circuit CC-m, the control circuit CC-m determines its own state, and if it is possible to receive the call, sends response data DATA-m via the data transmitting circuit T-m. In addition, the control circuit CC
-m causes the speaker SP-m to output a ring tone, and causes the lamp LMP-m-1 corresponding to the incoming call line INT-1 to blink. On the other hand, in the key telephone KT-j other than KT-m, the data DATA-1 sent from the key telephone KT-1 is
is ignored. The response data DATA-m from the button telephone KT-m is read only into the button "Turtle telephone KT-1", thereby controlling the control circuit CC-1 and the oscillation circuit 0SC-1.
1 to send a ringing tone to telephone circuit NW-1. On the key telephone KT-m that is receiving a call, the user raises the handset HND-m and presses the line button KEY-m-.
When you press 1, the control circuit CC-m determines that the incoming call has been answered, stops the ringtone, and turns on the lamp LMP.
-m-1 is turned on, and the telephone line switch SW-m connects the extension telephone line INT-1 and the telephone circuit NW-m.

Further, the fact that a response has been made to the incoming call is sent out on the control line CL as data DATA-m. When the button telephone KT-1 receives the response data DATA-m, it stops the ringing sound and connects the extension telephone line INT-1 and the telephone circuit NW-1 by the telephone line switch SW-1.

As a result of the above operations, two telephone circuits NW-1 and NW-
A call route is set between the two key telephones KT-1 and KT-m via the extension telephone line 1NT-1.
You will be able to make calls between. When the call ends and one of the users, for example the user of the key telephone KT-1, dials the handset HND-1, the switch HS-1
A change in the state of is transmitted to the control circuit CC-1. In response to this, the control circuit CC-1 memorizes that the extension telephone line 1NT-1 becomes vacant, restores the telephone line switch SW-1, and turns off the line lamp LMP-1-1.

It also sends information on the end of the call to the control line CL. When the button telephone KT-m receives call termination information, the button telephone KT-m
-1, the availability of extension telephone line NT-i is memorized, the telephone line switch SW-m is restored, and the line lamp LMP-m is restored.
-1 is turned off. Upon receiving the call termination information, the other key telephones KT-j memorize the availability of the extension telephone line 1NT-1 and turn off the line lamp LMP-j-1. As a result, the extension line 1NT-1 is completely opened and can be used for other calls from now on. Above, we have explained in detail an example of the operation in the case of mutual extension calls, but basically, the key telephone KT-1 that uses the telephone line always informs the other key telephones of its usage status, and each key telephone By remembering this, you can control your own actions. As a result, various functions such as responding to an incoming call from a central office line, holding a telephone call on a central office line, and transferring a call can also be realized by the method using the present invention. As explained above, according to the present invention, a button telephone device can be configured simply by connecting a plurality of button telephones in parallel to a speech line and a control line, thereby eliminating the need for a complicated and expensive button telephone main device. No longer needed.

Moreover, since each button telephone is realized with the same configuration, mass production is possible. Further, rapidly progressing semiconductor integrated circuit technology can be effectively applied to the circuit configuration of each button telephone. For these reasons, there is an advantage that key telephones can be made significantly more economical and smaller. Further, since the control that was performed by multiple pairs of wiring in the conventional key telephone device can be performed using only one pair of control lines, the number of core wires of the wiring cable can be reduced. Taking the case of configuring a button telephone device for 4 central office lines as an example, the conventional method required 40 cables, but according to the system using the present invention, 8 cables for central office lines are required. Wiring is possible with a total of 14 cable cores: 2 for internal calls, 2 for control, and 2 for power supply. Therefore, it is possible to achieve a reduction in cable prices due to a reduction in the amount of cables used, and a significant reduction in labor costs due to ease of installation and wiring change work. Furthermore, in the configuration of the present invention, the control functions are distributed to each button telephone, so a failure in the control circuit only affects the function of a specific button telephone, and the influence of the failure does not spread to the operation of the entire system. This increases the reliability of the system. Furthermore, depending on the method of using the control line in the present invention, the period for transmitting data from each key telephone is not fixed, but is automatically set according to the total number of key telephones. Therefore, when adding a key telephone, it is only necessary to connect the new key telephone in parallel to the existing call line and control line, and there is no need to make any changes to the existing system. It also has the advantage of high efficiency in the use of control lines, regardless of the number of telephones. As described above, the present invention has very excellent features and advantages that have not been seen before, so the effects brought about by the present invention are very large.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a connection method between key telephones according to the present invention, FIG. 2 is a block diagram showing an embodiment of the present invention, and FIG. 3 is an example of the data structure sent by the button telephone according to the present invention. FIG. 4 is a time chart showing the timing at which data transmitted from each push-button telephone appears on the control line, and FIG. 5 is a block diagram showing a specific example of the structure of the timing detection circuit. CO-1 to CO-k: central office line, INT-1 to NT-l
: Extension telephone line, PWL: Power supply line, CL; Control line, KT-
1 to KT-m: button telephone, PW: power supply circuit, SW
-1: Call path switch, NW-i: Telephone circuit, CC-
1; Control circuit, SWD-1; Switch drive circuit, COI
F-1: Office line interface circuit, KEY-1-1 to KEY-1-P: Button arrangement, HS-1: Hook switch, D-1: Push button dial, KIF-1: Button information input circuit, LMP- 1-1 to LMP-1-q: lamp, LD-1: lamp, drive circuit, 0SC-1: oscillation circuit, AMP-i: amplifier, HND-1: handset, SP-1: speaker, HLD-1; Holding circuit, T-1
: Data transmitting circuit, R-1: Data receiving circuit, TD-1
: Timing detection circuit, DATA-1: Data word, ST
: Data start signal, DST: Key telephone designation information, 0
RG: Send button telephone identification information, LN: Line number information, STT: Button telephone status information, END: Data end signal, SSW-1: Small switch, ID-1: Free time detection circuit, CT-1: Counting circuit, ED-1: END signal detection circuit.

Claims (1)

[Claims] 1 Accommodates the office line, extension call line, and control line that should be connected in parallel to other similar key telephones, and transmits various data necessary for communication with other key telephones via the control lines. A decentralized control type button telephone comprising a data transmitting and receiving circuit for transmitting and receiving data, a memory for storing channel conditions of a central office line and an extension telephone line, a telephone line switch, a telephone circuit, and a control circuit. , when making a call to another similar key telephone via the extension line, the control circuit confirms from the memory that the extension line with the relevant number is free by inputting the extension line number designation information. Capturing the calling line and displaying the fact, and then transmitting the calling line number to other similar telephones via the control line by the data transmitting/receiving circuit to ensure that the extension calling line of the number is not vacant thereafter. Then, when information specifying the other party's telephone is input, the information is sent onto the control line by the data transmitting/receiving circuit under the control of the control circuit, and the information is transmitted from the other party's telephone to the control line and the data transmitting/receiving circuit. When a response is received through the circuit, the control circuit displays a message to that effect, and then connects the extension line to the telephone circuit using a call path switch, thereby making it possible to talk to other key telephones. A decentralized button telephone featuring: