JP2776422B2 - Telephone switching equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a telephone exchange. [Background Art] Conventionally, in a telephone exchange of this type, an extension and an outside line are always connected in a standby state.
When a door phone is called, a closing signal or a dial signal due to off-hook of a telephone connected to an extension is transmitted to an exchange of the central office via an external line, and the exchange of the central office is activated. [Purpose of the Invention] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to allow an outside line to be immediately dispatched and no dial signal to be sent to a telephone exchange when an extension is called. Providing telephone exchange equipment. [Disclosure of the Invention] The present invention provides a switch means for opening and closing between an outside line and an extension from a telephone station, an incoming detection unit for detecting an incoming signal from the outside line, and energizing the extension when at least the extension is disconnected from the outside line. Current source, and off-hook detection means for detecting the off-hook of the telephone connected to the extension, and within a fixed time from the detection of the first dial signal transmitted after the off-hook of the telephone connected to the extension is detected At least a dial signal transmitting means for direct-currently closing the external line when the next dial signal is detected and transmitting the dial signal to the external line in the order of the data of the dial signal; The extension is connected to the extension by the switch means, and the connection between the extension and the extension by the switch is released when the on-hook is detected at the end of the external call. It is characterized by being formed like this. Hereinafter, the present invention will be described with reference to examples. FIG. 1 shows the configuration of a telephone system using the apparatus of the present invention. A telephone exchange apparatus 1 is connected to an outside line 2 connected to a telephone office, and to a telephone outlet 6 for connecting a general single telephone set T. Extension 4 and control line 5, communication line 7 connected to doorphone slave 3, security sensor 8,
The signal lines 10 and 11 connected to the alarm unit 9 are connected, and the general telephone T connected to the extension 4 and the external line 5 are connected.
, A call between the general single telephone T connected to the extension 4 and the intercom slave unit 3, and a transmission and display of a voice signal for reporting a line state to a notification speaker provided at the telephone outlet 6. Transmission of display control signals to the unit, furthermore, signal input from the sensor 8 and its processing, and
A circuit unit is provided for transmitting an alarm signal to the alarm unit 9 based on the signal from the telephone outlet and transmitting an alarm signal to the notification speaker of the telephone outlet 6. FIG. 2 shows a circuit configuration of the telephone exchange apparatus 1. In this circuit, an external line switching relay Ry is provided between the external line 2 and the internal line 4.
A _first relay contact r _1, the r ₂ b contacts, are inserted a series circuit of the off-hook dial pulse detection circuit 12. And between L _1, L ₂ wire outside line 2 is connected a series circuit of the relay contact r ₃ of the dial signal transmitting relay Ry ₂ and the resistor Ra, there are connected further incoming detection circuit 13, a hold circuit 14 . With the a-contact of the external switch relay Ry ₁ connects a current source 15 for the extension call, intercom call circuit 18
And the intercom slave terminal connection terminals 17 ₁ and 17 ₂ are connected via the switch element 19 ₁ or 19 ₂ . Further it is connected to the output from the mixing amplifier 21 mixes the signal of the audio signal and a constant frequency from the melody IC20 via the transistor Tr _1. The doorphone slave unit connection terminals 17 ₁ and 17 ₂ connect the doorphone slave unit 3 respectively, and receive a call signal from the doorphone slave unit 6 via transistors Tr ₂ and Tr ₃ to input port R ₅ of a control circuit 22 described later. , R _4, and outputs the audio signal from the mixed amplifier 21 to the door phone body 3 via the transistors Tr ₄ , Tr ₅ . The control circuit 22 controls the connection between the external line 2 and the internal line 4 by controlling the transistors Tr ₆ and T ₇ for driving the relays Ry ₁ and Ry ₂ with signals output from the output ports O ₆ and R _6. And a function of transmitting a DC signal and transmitting a dial signal, and an incoming detection signal from the incoming detection circuit 13 to the input port R _8.
A hold control function for sending a hold control signal from the output port O ₇ to the hold circuit 14 when a hold operation described later is detected, and closing and holding the outside line 2 by the hold circuit 14 when a hold operation described later is detected. , a door phone call detection function by the input call signal from the intercom slave unit 3, the output port P ₁ and P ₀
A back tone transmission control function to the intercom slave unit 6 by a control signal from the control unit, a door phone selection control function by a signal from the output ports O ₅ and O ₄ to the switch elements 19 ₁ and 19 ₂ ,
A function for the determination of data of off-hook detection and dial signal takes in the detection signal from the off-hook dial pulse detection unit 12 to the input port K _0, a timer function comprising the time interval measurement of the dial signal, further control line 5 To amplifier 23
A display drive function of applying a voltage signal corresponding to the line state through the further transistor Tr _8, the output signal of the transistor Tr ₁₀ and the output port R ₇ which is turned on by the output signal of the output port P ₃ to the audio signal Tr Control line 5 via amplifier 24 which operates when ₉ is turned on and DC cut capacitor Ca
A voice transmission function that superimposes and transmits on
₁₁ are turned on by the output of the output port R ₁₂ and a simultaneous broadcast function of transmitting an audio signal from the general single line telephone T of predetermined telephone outlet 6 connected to the extension 4 through an amplifier 24 to another telephone outlet 6 further and the function of performing alarm notification is taken from the sensor 8 an oN signal to the input port K _2, audio signals from the security system is detected by the speech detection section 25, an alarm notification when input to the input port K ₃ It has functions to perform. The signals from the output ports C _{0 to} C ₃ are signals for setting the level of the voltage signal, and the output ports R _{0 to} R ₃ and R ₁₁
Is a signal for selecting the audio signal of the melody IC 20. The output port P ₂ is the port to set the volume level of the audio signal, the port and the output port R ₁₀ is for outputting a signal having a predetermined frequency to the mixing amplifier 21 (e.g. 400 Hz), also further input port K ₁ is input port of the test switch SW, the output port R _13, R ₁₄ is a light emitting diode LEDa, ports for controlling the LEDb for displaying the line status. Switch SW ₀ is a switch for providing the number of connection intercom slave unit to the control circuit 22. Next, the operation of the telephone exchange of the present invention will be described. First, in this embodiment, when the power is turned on and the system starts, the control circuit 22 comprising a one-chip microcomputer first performs an initial setting and then goes into a standby state to determine a hook-off, and further, a determination as to whether or not there is an incoming external line. And outside line call processing, determination of the presence / absence of a door phone call and door phone call processing, determination of the presence / absence of an extension call, extension call processing, outside line call processing, and the like. Now, when raising the handset of the general single telephone set T connected to the telephone outlet 6 for calling an external line, the relay contacts r ₁ and r _{2 of the} external line switching relay Ry ₁ are now connected to the a contact side. For this reason, the off-hook dial pulse detector 12 detects a current generated by DC closing by the telephone and inputs a detection signal to the control circuit 22. The control circuit 22 outputs a voltage signal that causes a voltage discriminating circuit (not shown) in the telephone outlet 6 to turn on a light emitting diode (not shown) for displaying an outside line. At this time, the light emitting diode (not shown) indicating that the extension is busy is controlled to be turned off. Of course, at the same time, the light emitting diode LEDa for the outside line busy display connected to the control circuit 22 of the telephone exchange 1 is turned on, and the light emitting diode LEDb for the inside line talking is turned off. The transmission and lighting of the voltage signal are continued until the first dial signal is input. When the first dial signal is detected by the off-hook dial pulse detecting unit 12 as shown in FIG. 3A sent from the general single telephone set T, the control circuit 22 stores the dial data in the built-in buffer memory. I do. Then, the built-in 3-second timer is operated. If the second dial signal is detected during the operation of this timer, it is determined that an outside line call has been made. Within 3 seconds
If there is no input of the second dial signal, other control processing is performed. In the case of an outgoing call, the data of the dial signal to be subsequently input is stored in the buffer memory. The control circuit 22 turns on the transistor Tr ₇ when the input of the second dial signal to drive the relay Ry _2, the DC closed as shown in Figure 3 with the outside line 2 resistor Ra and the relay contact r ₃ (b) Tie. Three seconds after the line is closed, the control circuit 22
Is sequentially read from the first dial data stored in the buffer memory, the relay Ry ₂ is intermittently operated as shown in FIG. 3 (b), thereby sequentially sending the dial signal to the outside line 2. At the same time, the data of the dial signal input from the general single telephone T is stored in the buffer memory. Thus, the dial data from the general single telephone set T is stored in the buffer memory simultaneously with the transmission of the dial signal to the outside line 2. The lost dial data stored in the buffer memory, a predetermined time (e.g., to operate the 5 second timer so as to correspond to the connection time t ₂ of the central office switch and 5 seconds obtained by blank period of about one second if this was a constant time) has elapsed by adding the t _3, the transistor Tr ₆ is turned off to switch the outside line connection relay contact r ₁ of the relay Ry _1, r ₂ to the contact b side, the process proceeds to external calls is there.
That consists generally single line telephone T Kano from the dial signal transmission is the end time t ₁ has elapsed to transition to outside call. By the way, if the dial signal is input from the general single telephone set T connected to the telephone outlet 6 and the dial signal is not input within 3 seconds, the input dial data is determined to be a different number from the outside line call, and the outside line 2 is closed. Without tying,
The post-control circuit 22 determines the number data of the dial signal. In the present embodiment, “7” is a door phone call, “9” is a simultaneous broadcast, and “0” transmission after a hold operation is a hold release. For example, if “7” is a dial signal number, the latest A call signal is transmitted to the intercom slave unit 3 on the side where the call is made. That is, the transistor Tr ₄ or Tr ₅ is turned on, and the audio signal from the melody IC 20 is transmitted to the doorphone slave device 3.
Send to That calls the intercom slave unit 3 by turning on the transistor Tr ₁ simultaneously to the general single line telephone T through the extension 4 and the transistor Tr _10, amplifier 24, capacitor Ca, via the control line 5 each telephone outlet 6 A sound signal is sent to the speaker to sound a speaker provided at each telephone outlet 6 to notify that a door phone is being called. And by the switch element 19 ₁ or 19 ₂ is turned on between the intercom slave unit 3 and the intercom call circuit 18, connecting the intercom slave unit 3 to the extension 4 through the door phone call circuit 18.
At the same time, a voltage signal for turning on the light emitting diode indicating that the extension is busy is transmitted to the control line 5, and at the same time, the light emitting diode LEDb that is connected to the control circuit 22 and indicating the extension is busy is turned on. Thereafter, a call can be made between the general single telephone set T connected to the telephone outlet 6 on the calling side and the intercom slave unit 3 on the called side. At this time, the relay contacts r ₁ and r ₂ of the outside line switching relay Ry ₁ are kept connected to the contact a. Similarly, when the dial signal is "9", the transistor Tr
₁₁ is turned on by the control circuit 22, and the audio signal from the telephone set T is transmitted to the speaker of each telephone outlet 6 through the control line 5 so as to be broadcast simultaneously. When an incoming signal is input from the outside line 2, the incoming signal is detected by the incoming detection circuit 13 and the incoming signal is output to the control circuit 22. When the control circuit 22 inputs this incoming detection signal, switches the external changeover relay Ry each relay contact r ₁ and the stopping excitation of _1, r ₂ to b-contact side. Therefore, the general single telephone set T connected to each telephone outlet 6... Is connected to the outside line 2 through the extension 4, and the built-in bell rings in each telephone set T. When the handset of the general single telephone set T connected to the telephone outlet 6 is raised by the ringing of the bell, the outside line communication state is established. By the way, if the user wants to make an extension call during the above-mentioned external line call or wants to make a door phone call, the call can be put on hold. First, if the handset of the telephone T during an outside line call is not on-hook and a dial signal corresponding to the hold, for example, “0” is sent from the telephone T in advance, the control circuit 22 reads the dial data and performs a hold process. Judge,
Perform hold processing. That is, the hold circuit 14 is operated by the control signal from the control circuit 22, and the external line 2 is closed to be in a hold state. At this time, the external line switching relay Ry ₁ is driven to activate the relay contact r ₁ ,
r ₂ is switched to the contact a side to disconnect the outside line 2 from the inside line 4.
To release the hold, a dial signal of "0" may be transmitted from the off-hook general single telephone set T connected to the telephone outlet 6, and the control circuit 22 which has detected the dial data of "0" sends the hold circuit 14 Is stopped, and each section is controlled to the original outside line communication state. Together with the control circuit 22 and the call signal is inputted from the intercom slave unit 3 sends back tone through the transistor Tr ₄ or Tr ₅ to the intercom slave unit 3 in standby, transistor
An audio signal is transmitted to the speaker of each telephone outlet 6 via the Tr ₁₀ , the amplifier 24, the capacitor Ca, and the control line 5 to notify that there is a door phone call. When the handset of the general single telephone set T goes off-hook, a voltage signal indicating that the extension is busy is sent to each telephone outlet 6 via the control line 5 and the light emitting diode LEDb is turned on. Although the above description relates to the call operation, when the sensor signal is input, the control circuit 22 causes the melody IC 20 to generate an alarm sound signal and sends it out to each telephone outlet 6 via the control line 5. An alarm sound can be emitted from each speaker. In addition, the alarm unit 9 can send an alarm to the alarm unit 9 via the amplifier 24 and the signal line 10 to issue an alarm. By the way, in the above embodiment, the extension 4 is set to be disconnected from the outside line 2 except for the outside line call.
When the control circuit 22 detects that the handset of the general single telephone set T connected to the telephone outlet 6 is off-hook from the on state and thereafter no dialing is performed for, for example, 30 seconds or more, turns off the transistor Tr ₆ to return the external changeover relay Ry _1, may be the relay contact r _1, r ₂ as forcibly connects the switching external 2 and the extension 5 to the contact b side. In other words, the busy tone from the exchange of the central office can be heard from the handset of the general single telephone set T, which is being handed up through an external line connection, so that the user can recognize that the hand is up. Inspection and notification (howler sound) can be received. In the above embodiment, the extension 4 is one line. However, it is needless to say that the configuration of the present invention can also be used in a telephone exchange device capable of switching a plurality of lines and making a call between extensions. It is not limited to the embodiment.
In the above embodiment, the dial transmission is of the dial pulse type, but a push button signal may be used. In this case, a DC closing circuit and a push button signal transmission circuit are provided to perform the same control as in the above embodiment. [Effects of the Invention] Since the present invention is configured as described above, an extension is not connected to an outside line except during an outside line call, so that even if a telephone handset is off-hook, a telephone exchange is activated. No external calls can be made immediately, and the same operation as dialing a normal telephone is sufficient.
In addition, there is an effect that even if dialing is performed for the process on the extension side, the exchange of the telephone office is not started.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall configuration diagram of a telephone system using the present invention;
FIG. 2 is a circuit diagram of an embodiment of the present invention, and FIG. 3 is a time chart for explaining the operation of the embodiment. 1 telephone exchange device, 2 external line, 3 door phone slave unit, 4 internal line, 5 control line, 7 telephone line, 12 telephone line
Off-hook / dial pulse detection unit, 13: incoming call detection circuit, 22: control circuit, T: general single telephone, Ry ₁ ...
External line switching relay, r ₁ , r ₂ … Relay contacts.

   ────────────────────────────────────────────────── ─── Continuation of front page       (56) References JP-A-61-237595 (JP, A)                 JP-A-62-114396 (JP, A)                 JP-A-62-243499 (JP, A)                 Shokai 61-124178 (JP, U)

Claims (1)

(57) [Claims] Switch means for opening and closing between the outside line and the extension from the central office, an incoming detection unit for detecting an incoming signal from the outside line, a current source for energizing the extension when at least the extension is disconnected from the outside line, Off-hook detection means for detecting the off-hook of the connected telephone, and the next dial signal is detected within a certain time from the detection of the first dial signal transmitted after the off-hook of the telephone connected to the extension is detected And at least a dial signal transmitting means for direct-connecting the outside line and sending the dial signal to the outside line in the order of the data of the dial signal, and connecting the outside line and the inside line by a switch means after completion of the transmission of the dial signal and upon detection of the incoming signal. In addition, the connection between the outside line and the inside line by the switch means is released when the on-hook is detected at the end of the outside line call. Telephone exchange device that. 2. 2. The telephone system according to claim 1, wherein the telephone line connected to the extension is connected to the extension by the switch when the telephone connected to the extension is hooked off-hook from on-hook and no dial signal is detected for a certain period of time. Telephone exchange equipment.