JPS63109693A - System for connecting and controlling key telephone system - Google Patents

Abstract

PURPOSE:To appropriately select a DP trunk line and PB trunk line regardless of the kind of telephone sets, by providing a transmitting channel switch in an extension circuit and operating the switch in such a way that the switch is opened while the connection of the circuit with a trunk line is controlled and closed while talking is made. CONSTITUTION:A transmitting channel switch 26 is opened while a telephone set 22 is on-hook. When the number of a called subscriber is designated from the telephone set 22, a control circuit 23 receives analyzed results from a DP reception analyzing circuit 24 or PB reception analyzing circuit 25 and sends DP signals from a DP signal generating circuit 18 or PB signals from a PB signal generating circuit 19 depending upon the kind of the designated trunk line 3. When a response is received, a polarity detecting circuit 20 detects the response and the transmitting channel 26 is closed. Thus a channel is formed. When the talking is terminated, each switch 17 and 26 is opened.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a connection method for a button telephone device.

(Prior Art) As a connection method for a two-wire button telephone device that uses a DP office line and a PB office line in combination, there is a circuit configuration shown in FIG.

In the figure, 1 is a main device, 2 is a button telephone for extension only, and 3 is a central office line.Although there are a plurality of telephones 2 and office lines 3, one of them is shown for convenience of explanation. Reference numeral 4 denotes a cross-point switch, which connects the extension lines to each other and between the extension lines and the office line. 7
, 8 are respective hybrid transformers which convert the two-wire system into a four-wire system consisting of a receiving path and a sending path 9.10 or 11.12, respectively. 13 and 14 are balance circuits for increasing the separation of the conversion. Reference numeral 15 denotes a control circuit, which includes connection control of the cross-point switch 4 and provides overall control of the main device 1. Reference numeral 16 denotes a reception analysis circuit that analyzes signals generated by pressing each button on the telephone 2 and sends the signals to the control circuit 15.

Reference numeral 17 denotes a loop switch as a central office line capturing means, which captures a vacant central office line 3 of a designated line type in the central office line circuit 6 by specifying a special number on the telephone 2, and also transmits a dial pulse when the central office line 3 is a DP circuit. Send a signal.

18 and 19 are DPs as calling signal generating means, respectively.
These are a signal generation circuit and a PB signal generation circuit.

A polarity detection circuit 20 detects that the polarity has been reversed based on the response.

In the configuration shown in Fig. 2, first, the key telephone 2 dedicated for extension
goes off-hook, the control circuit 15 switches the reception analysis circuit 1
6, the off-hook signal is received and control of the telephone 2 is started. When the central office line button of the telephone 2 is operated, the control circuit 15 similarly receives the central office line designation signal, closes the loop switch 17 of the designated central office line 3, and uses the crosspoint switch 4 to connect the telephone 2 to the central office line. Connect network 3. When the telephone number 2 is dialed, in response to this, if the specified office line 3 is a DP office line, the DP signal generation circuit 18 opens and closes the loop switch 17 to double the DP. Send a signal. In the case of a PB station line, the loop switch 17 is closed and the PB signal generating circuit 19 sends out a PB double signal. When there is a response, the polarity detection circuit 20 detects it and a communication path is established.

In FIG. 2, the telephone is equipped with a dedicated button telephone 2, but if the telephone is equipped with a standard DP telephone or PB telephone instead, a DP reception analysis circuit is used instead of the reception analysis circuit 16. and a similar PB signal analysis circuit in the transmission path 10, each of which is controlled as follows. In addition, in the following description, FIG. 2 will be referred to as appropriate.

(1) When making a call from a DP telephone, when the telephone goes off-hook, the DP reception analysis circuit sends this to the control circuit IS.

Here, when the DP office line of office line 3 is designated from the telephone by special number dialing for office line number selection, the control circuit 15
Upon receiving this via the reception analysis circuit, the loop switch 17 of the office line 3 of the selected DP is closed. Thereafter, a communication path is formed in the same manner as the operation shown in FIG. 2 described above.

When a PB station line is designated by the special number dial, the control circuit 15 receives this via the DP reception analysis circuit,
The central office line 3 of the PB is selected, its loop switch 17 is closed, and the cross-point switch 4 connects the telephone set to the network of the central office line 3. When the destination number is dialed, the PB signal generation circuit 19 transmits a PB double signal in response to the dialed number, and a communication path is formed in the same manner as in FIG. 2.

(2) When making a call from a PB telephone, when the telephone goes off-hook, the PB reception analysis circuit sends this to the control circuit 15. The control circuit 15 selects the DP office line from among the office lines 3 for a call from a PB telephone, and when the destination number is specified by button operation, the operation is similar to that shown in FIG. , DP signal generation circuit 1
A DP double signal is sent from 8, and a communication path is formed by the response.

(Problems to be Solved by the Invention) However, with the circuit configuration shown in FIG. 2, the telephone is limited to a button telephone exclusively for extension calls, so it cannot accommodate diversification or versatility.

In addition, if a standard DP telephone is used in accordance with the second circuit, when making a call from the PB telephone, it is assumed that the PB central office line is selected by the special code for central office line selection, and the relevant central office line 3 is selected. connection is established, and when the other party's number is subsequently specified by button operation, the PB double signal is analyzed by the PB reception analysis circuit, and the PB signal is sent from the PB signal generation circuit 19.
Although a doubled signal will be generated, the PB doubled signal caused by the button operation 1 will be sent to the central office line 3, which will interfere with connection control by the exchange. Therefore, in this case, it is necessary to prohibit the selection of the PB office line, and the use of the office line is limited.

SUMMARY OF THE INVENTION An object of the present invention is to provide a connection control system for a button telephone device that allows a DP office line and a PB office line to be appropriately selected without being restricted by the type of telephone.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention has a main device that accepts a mixed office line of DP office lines and PB office lines, and accommodates DP telephones and PB telephones. In the connection control method of the button telephone device, a normally open transmission path switch opens and closes the transmission path in the extension circuit, and a central office line capture means for the central office line circuit to capture the central telephone line in response to a call from the telephone; A reception analysis means receives the DP double signal or PB double signal from the telephone and reads the telephone type and the destination number, and generates the DP double signal or the PB double signal according to the line type of the captured office line. and when a response to the transmission or a predetermined confirmation corresponding to the response is obtained, the transmission path switch is closed to form a communication path, and upon termination of the call, It is designed to open the circuit.

(Function) When the transmission path switch is in the open state, the central office line is captured by a special number etc. from the telephone, and the destination number is read in response to the DP double signal or F'B signal from the telephone. , a DP double signal or a PB double signal is sent to the relevant office line depending on the line type of the relevant office line. Therefore, in the process, transmission of the DP double signal or PB double signal from the telephone to the central office line is blocked by the channel switch. When there is a response, the transmission path switch is closed to form a communication path, and when the call is terminated, the transmission path switch is opened to return to the initial state.

(Embodiment) Fig. 1 is a circuit diagram of a button telephone device showing an embodiment of the present invention, and parts equivalent to those in Fig. 2 are denoted by the same reference numerals, and their explanations are omitted as appropriate. do.

In the figure, 21 is the main device, 22 is a two-wire standard D
The telephone 22 is composed of a plurality of P telephones or PB telephones, but for convenience of explanation, only one of them will be described. 23
is a control circuit that collectively controls the main device 21. 24 is a DP reception analysis circuit as reception analysis means, and the telephone 22 is a DP reception analysis circuit as a reception analysis means.
When using a P telephone, specify the office line by special number and specify the destination number by dialing (by analyzing the DP double signal, the control circuit 23
Send to. Similarly, 25 is a PB reception analysis circuit which serves as a reception analysis means, and when the telephone 22 is a PB telephone, it can specify the central office line by special number and the destination number by button operation (P
The B-fold signal is analyzed and sent to the control circuit 23.

Reference numeral 26 denotes a normally open transmission path switch, which opens and closes the transmission path 10 in the extension circuit 5 with respect to the crosspoint switch 4. Reference numeral 27 denotes a switch control unit, which controls the opening and closing of the channel switch 26 under the control of the control circuit 23, and closes the channel switch 26 when the polarity detection circuit 20 detects the polarity reversal of the central line in response. It will be opened by the end of the episode.

The operation of the configuration shown in FIG. 1 above will be explained below.

The transmission path switch 26 is open when the telephone 22 is on-hook. DP or PB standard telephone 2
When the telephone 2 goes off-hook, the control circuit 23 receives the off-hook signal via the DP reception analysis circuit 24 and starts controlling the telephone 22 in question. When a central office line is designated by the telephone set 22 using a special number, the designation is analyzed by the DP reception analysis circuit 24 or the PB reception analysis circuit 25, and the result is sent to the control circuit 23. Control circuit 2
3 closes the loop switch 17 connected to the specified office line 3, and connects the telephone 22 to the network of the office line 3 by means of the cross-point switch 4. When the destination number is specified by the telephone 22, the control circuit 23 similarly receives the analysis result from the DP reception analysis circuit 24 or the PB reception analysis circuit 25, and performs a selection according to the type of the specified central office line 3. Similar to the operation shown in FIG. 2, the DP signal generation circuit outputs the DP signal or the PB signal generation circuit 19 outputs the PB signal. When there is a response, the polarity detection circuit 20 detects it, and the transmission path switch 26 is closed to form a communication path. Then, due to the end of the call, each switch 17
．． 26 is open.

In addition, if the polarity is not reversed at the time of response, such as when central office line 3 is connected to a private branch exchange, if the operation for specifying the destination number exceeds a predetermined time interval, a confirmation equivalent to a response will be obtained. At this time, the channel switch 26 is closed.

Although in the system shown in FIG. 1, the telephone 22 is a standard DP telephone or PB telephone, a button telephone exclusively for extension calls may be used in combination, as in FIG. 2. In that case, for example, the DP reception analysis circuit 24 is provided with the function of the reception analysis circuit 16 shown in FIG. It is possible to control the connection including the control of

(Effects of the Invention) As explained above, according to the present invention, a transmission path switch is provided in the extension circuit, and the transmission path switch is kept open during connection control with the office line, and only during a call. Since the circuit is opened, a signal from the telephone on the calling side is not sent to the office line during connection control, so that connection control is performed regardless of the type of telephone, and the type of office line is not limited.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram of a button telephone device showing an embodiment of the present invention, and FIG. 2 is a circuit diagram of a button telephone device showing a conventional example. 3... Office line 5... Extension line circuit 6... Office line circuit 17... Loop switch (office line capture means) 20...
- Polarity detection circuit 21...Main device 22...Telephone 23...Control circuit 26...Talking path switch.

Claims (1)

[Scope of Claims] In a connection control system for a button telephone device in which the main device accepts a mixed DP office line and PB office line and accommodates a DP telephone and a PB telephone, A normally open channel switch that opens and closes the channel, a central line capturing means that captures the central line in the central line circuit when a call is made from the telephone, and receiving a DP signal or a PB signal from the telephone to determine the type of telephone and the other party. A reception analysis means for reading the destination number, and a calling signal generation means for generating a DP signal or a PB signal according to the line type of the captured office line and transmitting it to the office line, and responding or responding to the transmission. 1. A connection method for a button telephone device, characterized in that when a predetermined confirmation corresponding to the above is obtained, the transmission path switch is closed to form a communication path, and the communication path is opened when the call ends.