JPH09121259A - Network controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize and economize the network controller which connects a facsimile equipment provided with the automatic reception function to a line. SOLUTION: In switching to the speaking state, an alarm generation part of a facsimile body 212 is used as a bell sound generation part of a telephone set; and in automatic reception of the facsimile body 212, facsimile communication is realized without emitting a ringing tone by time limit monitor of a prescribed facsimile signal, based on an incoming detection means 222.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a network control device for connecting a facsimile machine having a communication function to a line.

[0002]

2. Description of the Related Art A conventional network control circuit has a structure as shown in FIG. 2, a CML relay 104 is in an open state during standby, a line is a telephone set, and a subscriber telephone network incoming call detecting means 106.
And the facsimile communication network incoming call detecting means 107, respectively, but when the incoming telephone network incoming call detecting means 106 or the facsimile communication network incoming call detecting means 107 detects an incoming call from the network, the CML relay 104 is closed, The telephone set, the incoming telephone network incoming call detecting means 106, and the facsimile communication network incoming call detecting means are separated from the circuit. The block 105 of the CML relay 104 forms a direct current circuit of the line, and a hybrid coil 110 for 2-wire to 4-wire conversion is formed by AC coupling with capacitors from both ends.
And connected to the facsimile machine via In the case of an automatic call, it is necessary to prevent a collision with an incoming call. For this purpose, first the L relay 101 is closed and the fat coupler 102 is closed.
After confirming that there is no polarity reversal of the line before the incoming call for a certain period of time with the output 103, the CML relay 104 is closed and P
The relay 108 is configured to be turned on / off according to the other party's number to transmit the pulse dial signal to the network. When the transmission of all digits of the dial number is completed, the other party's response is confirmed by the polarity reversal detection circuit 109, and the CML relay 10
Facsimile communication is performed in a state where 4 is closed and the line is captured. It should be noted that the slicing device 111 is in a closed state in a normal case other than during a test or maintenance inspection. The subscriber telephone network incoming call detecting means 106 and the line are coupled by a photocoupler AC-coupled by a capacitor, and the facsimile communication network incoming call detecting means 107 and the line are coupled by a transformer AC-coupled by a capacitor. . The telephone is C-ready for calls during stand-by or control procedures when the sill is open for testing or maintenance.
When the ML relay 104 is opened, it is connected to the line. A two-wire / four-wire conversion circuit similar to the hybrid circuit 110 is also built in the telephone so that the transmitter and the receiver can be connected to the line.

[0003]

Even in the case of facsimile communication, the conventional network control circuit as described above always causes an attached telephone to ring a ringing tone for a moment when receiving an incoming call from the subscriber telephone network, and unnecessary noise is generated. Will occur. this is,
Since the telephone set is connected in parallel with the incoming call detection circuit during standby, the time until the termination of the incoming call detection and the switching of the CML relay is caused by the bell sound of the telephone set. Also,
Since it has two hybrid circuits including the inside of the telephone, it also has the drawback of complicating the circuit.

The present invention solves the above-mentioned disadvantages of the prior art, and provides a network control device in which a telephone does not ring a bell at the start of automatic facsimile reception in a subscriber telephone network. The purpose is to

[0005]

That is, in the network control device according to the present invention, when the facsimile signal is detected after the ringing signal is detected by the incoming call detecting means, the facsimile communication is immediately performed without ringing the telephone bell. When the facsimile signal is not detected within a certain period of time, the control means causes the alarm sound generation unit of the facsimile device to ring a ringing tone and shift to a talking state.

With this, by the time connection monitoring of the facsimile signal by the connection with the transmitter and the receiver, the bell sound of the telephone is not sounded at the start of the automatic reception of the facsimile, and the bell of the telephone is transferred even when the telephone is in the call state. Since the sound generating unit can also be used as the alarm sound generating unit of the facsimile main body, it is not necessary to provide an attached telephone and the circuit can be downsized.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A network control circuit according to an embodiment of the present invention will be described in detail below with reference to FIG.
Is a divider for disconnecting the line from the facsimile and directly connecting it to the test telephone at the time of testing or maintenance, and is composed of a slide switch. Normally, this test telephone is unnecessary and the divider 201 Keep it closed. 2
Reference numeral 02 denotes a rectifier circuit composed of a diode bridge, which converts the signal form from the balanced type to the unbalanced type while keeping the line polarity state constant. Reference numeral 203 denotes a transmission signal source such as a modem transmission unit, a signal tone transmission unit, a telephone transmitter unit, a tone dial unit, and a voice response unit of the facsimile main body 212 via a hybrid circuit 226, an analog switch 218, and a capacitor 217 according to a control procedure. It is a multiplexer for controlling transmission to the line. 204
Reference numerals 205 and 205 divide the direct current of the line to photocoupler 208.
A resistor for energizing the light emitting diode constituting the
Reference numeral 6 is a varistor for overvoltage protection, 207 is a capacitor for AC signal bypass, and 209 is a constant voltage diode for overvoltage protection. The photocoupler 208 is composed of a pair of light emitting diodes and transistors which are connected in parallel in opposite directions in order to detect the polarity reversal of the line. 210 is the photocoupler 2 without capturing the line prior to automatic calling.
Reference numeral 211 denotes a transistor that controls a weak current that enables one of the 08 light emitting diodes to be turned on, and 211 denotes a resistor that determines this current value. Facsimile body 212
Controls the network control circuit of the present invention based on the communication procedure.
Reference numerals 213 and 214 denote Darlington-connected transistors for capturing the line during communication and for turning on / off the pulse dial signal transmission. The resistor 227 determines the current value when capturing the line. 21
Reference numeral 5 is a resistance for supplying a minute current to the gate of the field effect transistor FET216 from a line in order to turn on the field effect transistor FET216, which is a MOS (Metal Oxide Semi).
The FET) 216 is connected to the resistor 21.
By the function of 5, the ON state is maintained from the standby time to the end of the incoming call detection. 217 is a capacitor for AC coupling, 218
Is an analog switch circuit for controlling the opening and closing of this AC signal with the hybrid circuit 226, which is turned off and has a high impedance except during communication. Reference numeral 219 is a buffer FET for guiding the ringing signal from the network to the incoming detection means 222 by high impedance coupling which does not affect the line.
220 is a resistor that determines this high input impedance, 2
Reference numeral 21 is a capacitor for AC coupling. The incoming call detecting means 222 integrates the frequency or period of the input signal to calculate the 16 Hz bell ringing signal of the subscriber telephone network and the 13 of the facsimile network.
The ringing ringing signal of 00 Hz is automatically identified. 223 is the input resistance of the FET 219, 224 and 225 are the FET 2
19 is a clamp diode for protecting the gate input.

Reference numeral 226 is a two-wire / four-wire conversion hybrid circuit composed of a differential amplifier and a resistor, which is coupled to the analog switch 218 with a line characteristic impedance of 600Ω. Reference numeral 227 is a resistor connected to the emitter of the transistor 214. Reference numeral 228 is a demultiplexer for selecting and guiding the reception signal from the hybrid circuit 226 to the reception circuit of the modem reception unit, the single tone detection unit or the telephone reception unit of the facsimile main body 212 according to the control procedure.

Next, the operation of the network control circuit configured as described above will be described. FET21 in the standby state
Only 6 is on, and the line is connected to the incoming call detecting means 222 only. At the time of automatic dialing, the FET 216 is turned off and the transistor 210 is turned on for about 300 milliseconds (hereinafter referred to as T ₁ ), and during this period, the photocoupler 208 detects the presence or absence of polarity reversal to prevent the collision of incoming and outgoing calls. When the photocoupler 208 detects polarity inversion during T _1, an incoming signal is sent from the network, so that the transistor 210 is turned off and the FET 216 is turned on.
After detecting the incoming call by the incoming call detecting means 222, the FET 216
Is turned off and the transistors 213 and 214 and the analog switch 218 are turned on to form a direct current circuit, and an alternating current signal is introduced to the facsimile main body 212 via the hybrid circuit 226, the multiplexer 203 or the demultiplexer 228 to make the facsimile communicable.
The automatic incoming call operation from the standby state is performed in exactly the same manner as the above except that the outgoing / incoming call collision prevention operation before the automatic outgoing call is not performed. When the polarity inversion is not detected within the ON state T ₁ period of the transistor 210, the transistors 213 and 214 are ON / OFF controlled according to the dial number while the transistor 210 is OFF, and the dial pulse is sent to the network. . When tone dialing is performed without using pulse dialing, the transistors 213 and 214 are turned on, and a dial signal is sent from the tone dial section of the facsimile main body 212 to the network via the multiplexor 203 and the hybrid circuit 226. When all digits have been dialed in this way, the transistors 213, 2
14 is turned on, and after confirming the connection response by the polarity inversion by the photo coupler 208, the analog switch 218
Is turned on to form a signal path for facsimile communication via the hybrid circuit 226.

When the photocoupler 208 does not detect the polarity reversal as a connection response confirmation from the network at the end of dialing, or when the interruption instruction from the network is detected as the polarity reversal during the facsimile communication, the facsimile stands by. Return to the state.

During a telephone call, the transmitter of the telephone of the facsimile body 212 is connected to the hybrid circuit 226 via the multiplexer 203 and the receiver to the demultiplexer 228. In this call state, the signal path is formed by the operation button instruction of the facsimile main body 212 or the incoming call detection means 222 detects the incoming call from the subscriber telephone network, and the single tone part, the voice response part and the modem of the facsimile main body 212 are detected. This is the case when a facsimile signal is not detected within a certain time after responding at the receiving unit.
At this time, the bell sounds for the first time. The bell sound generation unit is generated as a ringing sound indicating a call request from the alarm sound generation unit of the facsimile body.

The semiconductor switch circuit or the analog switch in the network control circuit according to the present invention is not limited to the configuration of the embodiment shown in FIG. 2, and may be a photocoupler considering insulation between the signal path and the switching control signal. You may comprise.

The switching element may be a FET or bipolar transistor, and a thyristor may be used.

[0014]

As described in detail above, according to the present invention, the bell sound generating section of the telephone is also used as the alarm sound generating section of the facsimile body, so that it is not necessary to provide an attached telephone and the circuit size is reduced. It is said that it will be possible to contribute to noise prevention because it is configured so that the telephone does not generate a ringing tone even when receiving a call from the subscriber telephone network during facsimile communication due to time monitoring of facsimile signals while further improving the efficiency and economy. It has an effect.

[Brief description of the drawings]

FIG. 1 is a block diagram of a network control circuit according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a conventional network control circuit.

[Explanation of symbols]

 201 Slide switch 202 Rectifier circuit 203 Multiplexer 216, 219 FET 206 Varistor 208 Photocoupler 209 Constant voltage diode 218 Analog switch 212 Facsimile body 222 Incoming call detecting means 223, 225 Clamp diode 226 Hybrid circuit 228 Demultiplexer

Claims (1)

[Claims] 1. A network control device for connecting a facsimile device having an automatic reception function to a line, and an incoming call detecting means for detecting an incoming call signal from a line network transmitted after the polarity of the line is reversed. When a facsimile signal is detected after the ringing signal is detected by the incoming call detecting means, facsimile communication is immediately started, and when the facsimile signal is not detected within a certain time, the alarm sound generator of the facsimile machine calls the facsimile. A network control device, comprising: a control unit that causes a sound to sound and shifts to a call state.