JPS6392197A - Key telephone system - Google Patents

Abstract

PURPOSE:To freely call and respond to a telephone terminal and to use it suitable for the various types of preferable key telephone systems by applying a call request to an additional equipment when a main equipment decides that it is necessary to call the telephone terminal, closing the telephone terminal correspondingly thereto and confirming the closing by a loop monitor circuit. CONSTITUTION:When any push-button telephone set ST executes an off hook, a CPU 14 receives this operating data to perform a button operation by a keyboard 37. Then, the CPU 14 controls the telephone set ST according to this operation to switch, selects line wire interfaces 111, 112, at the time of an external origination to execute a dial transmission and makes the telephone set ST busy according to the instruction of a display circuit 36 to the remote telephone set ST at the time of an extension origination. An incoming call from line wires 21, 22 is detected in the line wire interfaces 111, 112, the display circuit 36 of the respective telephone set ST are operated by the CPU 14 according thereto to issue a line wire incoming ring tone.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a button telephone device that accommodates an outside line and a two-wire telephone terminal, and connects at least the two-wire telephone terminal and the outside line. .

[Conventional technology]

The call button telephone device is disclosed in Japanese Patent Application No. 104897/1989 filed separately by the present applicant.
16I (
Since it is not equipped with a calling signal generator that generates a calling signal for Z, this is called a call transfer, and the notification that transfer will be made is made by voice.

[Problem that the invention seeks to solve]

Therefore, conventionally, when a telephone terminal is placed in a separate room, it is inconvenient because transfer cannot be performed immediately, and when a facsimile machine, an answering machine, etc. that automatically responds to a 16Hz ring signal is used as a telephone terminal, On the other hand, when a private billing telephone is used as a telephone terminal, it operates a relay for i-mail detection using a 16Hz ringing signal, allowing free answering calls. This has caused problems such as making answering calls impossible.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention relies on the following means.

That is, in a button telephone device in which a two-wire telephone terminal is connected to the main device by an interface circuit including a loop monitoring circuit, and at least a connection is made between the two-wire telephone terminal and an outside line accommodated in the main device, the 16 Hz A ring signal generator that generates a ring signal of a switching circuit that switches the output terminal side to the calling signal generator side in response to a calling request; a loop monitoring circuit that monitors loop closure on the output terminal side when this switching circuit performs switching; The output of a loop monitoring circuit is provided with an additional device having a forced recovery circuit that forcibly restores the switching circuit in priority to a call request, and the loop is closed in response to a response from a telephone terminal in the main device. The decision shall be made accordingly.

[For production]

Therefore, when the main device determines that a call to the telephone terminal is required, a call request is given to the additional device, and the corresponding switching circuit is switched! 1) A 16Hz ringing signal is sent to the telephone terminal, and when the telephone terminal responds and closes the loop, this is detected by the loop monitoring circuit of the additional device, and the switching circuit is activated according to this output. When the system is restored, the SIMI telephone terminal is connected to the main device, the loop monitoring circuit within the device detects the closure of the loop, and the main device determines the response of the telephone terminal based on this output. becomes.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to figures showing examples.

FIG. 2 is a block diagram showing the entire configuration. are accommodated, and connectors CNI to CNm according to the accommodation position are accommodated.
% and line 3 with one pair each of speech lines and signal lines
Through 1-3m, key telephone (hereinafter referred to as S, T) 41-
4m is connected, and the outside line 2112s is connected to the call path switch (hereinafter referred to as 'rsw) 12 through charging signal detection circuit (hereinafter referred to as KSD) 10+, 10z and outside line interface (hereinafter referred to as LIF) 111% 1h. On the other hand, the TSW 12 and the lines 31 to 3m from each ST4+ to 4m are connected to the gL phone interface (hereinafter referred to as T
They are connected via IF) 131 to 13m, and exchange connections are made by cross points such as analog switches or relay contacts in the TSW 12.

Outside, -i! ! When using spring-must to store and display call charges, even though it is a general subscriber line, it sends billing signals such as polarity reversal pulses just like public telephone lines. KSD 10t has recently been provided, and considering the case where this billing line is used as outside @ 21122 or as either one of them, KSD 10t
s 102, and line transformers are provided between LIFlh and Ih in order to eliminate noise caused by the deflection pulse.

In addition, LIFI h, 11z has functions such as incoming call detection, DC loop closure for outside lines, hold, and dialing using pulse signals or composite audio frequency signals. TIF13+~13m has an exchange connection function between ST4+~4m and 5T41~4m.
In addition, it supplies power for communication via a communication line, transmits and receives data signals via a signal line, and supplies power for control.

In addition, KSUl includes a processor such as a microprocessor (hereinafter referred to as CPU) 14, fixed memory (hereinafter referred to as ROM) 15, and variable memory (hereinafter referred to as RAM).
16, the CPU 14 executes the program in the ROM 15, and stores predetermined data in the RAM.
It will be controlled while accessing 16!
J, KSDlot, 1 (detection power from h, LIFll
l, 11! Incoming call detection power, TIFl3> ~13
LIFI 1+, 11z, TS
In addition to controlling Wl 2 and TIFl 3t to 13m, it also controls 5T41 to 4m by transmitting control data via TIFs 131 to 13m.

On the other hand, relay 2WX, 2W, FX O each contact 2wx,
2w.

External line 21.2 via fx! A connecting terminal ttqtx is provided, which is connected in parallel with the terminal ta, t.
For l, a loop monitoring circuit using a photocoupler etc.
Hereinafter, LPS) 171, 17g are inserted in series, and each terminal t1, t! monitors the loop current flowing through the 2@-type telephone (
2WT) 5, and a facsimile machine with an automatic response function (hereinafter referred to as FAX) connected to the connection terminal t2.
) 6 is detected, and this detection output is provided to the CPU 4.

Note that the contacts 2w and fx are for secret switch, and if necessary, the CPU 14 drives the relay 2W1 FX,
It is designed to separate WT5 and FAX 6 from outside lines 21 and 22, and when transferring an outside line call to 2WT5 in response to a hold operation on the Sr4 side and dialing a specific number, if the call is to outside @22, The CPU 14 drives the relay 2WX and switches the j9.2WT5 from the outside line 21 to 22 using the contact 2wx.

However, the 2WT5 is equipped with an additional device (hereinafter referred to as ADP), which will be described later.
) 7 to contact 1+, and when making a transfer call to 2WT5, the external buzzer drive circuit (
Below, the CPU is connected via F, XB) 18 and connection terminal t3.
14 continuously sends out a call request signal, which ADP 7
For example, track 3
The power supply for 874m is branched out from the signal line of m, and is supplied as the power supply for ADP7.

On the other hand, in 5T41 to 4m, a communication circuit (hereinafter referred to as TKC) 31 is connected to a communication line 32, and a signal line 33 is connected to a CPU 14 and a ROM 15 through a transmission circuit (hereinafter referred to as 5RC) 34.

It is similar to the RAM 16, but a smaller control unit (hereinafter referred to as CNT) 35 is connected, and a display circuit (hereinafter referred to as D
P) controls the digital display (hereinafter referred to as "DGP"), tone generator, and amplifier in the 5RC36, and performs the display by the DGP and the emission of a W ring tone by the speaker in accordance with the control data via the 5RC34, and Similarly, according to the control data, the keyboard (hereinafter referred to as KB) 37
In addition to controlling the lighting of each indicator light inside the KI337 and the blinking of the 1st light, it also transmits operation data indicating these conditions via the 5RC34 in response to the operation of each button in the KI337 and the operation of the hook switch HS. It has become.

In addition, 5RC34 has a power supply separation function, and the signal line 33
The power supplied from the KSU1 side is extracted through the power supply, stabilized, and then supplied to each necessary part as local power.

Therefore, when off-hook is performed on any Sr1, the operation data of this is received by the CPUI4, and the button operation in KB37 is also the same, and the outside line button
Alternatively, in accordance with the operation of the extension button and dial button, the CPU 14 controls the TSWl 2 to establish an exchange connection and, in the case of an outside line call, select the selected LI
A side dial call is made under the control of Fll, and if it is an extension light call, an extension ringing tone is emitted under the control of DP36 for Sr1 on the other party's side9, and the call state is established by a response from the other party's side.

In addition, live calls from outside line 21.22 are available from LIFl 11.
1hK is detected, and in response, the CPU 14
In order to control the DP36 of T4+~4m and emit an outside call incoming ringtone, if any Sr1 responds by off-hook, the CPUI 4 will respond to TSWl2 accordingly.
control and complete the communication path.

Incidentally, at the same time as these controls, the indicator lights in the KKB37 are also controlled, and the corresponding lights are turned on.

In addition, calls from the 2WT 5 and the FAX 6, or responses to layered messages, are detected by the LPS17s 172, and the CPU 14 performs corresponding control according to the detection power.

In addition, when a call is made to a billing line and the other party answers, the billing signal that arrives as the call continues is sent to the KSD.
Since l 0 *, 1 (h is detected sequentially, the CPU 4 counts and stores it in the RAM 16 for each Sr1 or 2WT 5 or FAX 6 that sends this number of times. This data is stored in the RAM 16 when 5T40KB37 is If you operate it properly, it will be displayed by the DGP installed in the DP36 of Sr1.

FIG. 1 is a circuit diagram of ADP7, with input terminal KA%KB connected to connection terminal t1 of KSU1, and 2WT5.
A relay contact rm1.1m2 as a switching circuit is inserted between the connected output terminals TA and TB, and the output terminals TA and TB and the input terminal KA.

KB is always connected, but when a call request signal is given as a DC voltage to the control terminals BA and BB connected to the connection terminal t3 of KSUl, the relay RM operates,
Since the contact rm1.1m2 connects the output terminals TA and TB to the ring signal generator (hereinafter referred to as RGG) 41 side that generates an intermittent 16 Hz ring signal, the 16 Hz ring signal is connected to the capacitor C1 and the resistor. Through an LPS 43 consisting of a light emitting diode of a photocoupler (hereinafter referred to as PC) 42 connected in series with R1, a varistor vR, a capacitor C, and a resistor R2 connected in parallel to these,
The message is sent to 2WT5 and causes its bell or tone ring r to ring.

Note that at this time, the power supply E for loop closure detection is applied via the resistor R3 and the diode D1, but 16H
The alternating current component of z is bypassed through the capacitor CzVC and
The light emitting diode A1 is in a non-emitting state.

Therefore, the light-receiving transistor of PGA1 is off, and the collector potential applied to the power supply E becomes "H" (high level) through the resistor R4, which is monostable through the resistor R. It is given to a pulse generator (hereinafter referred to as PG) 43 such as a multi-by-break, and its output is set to "H", turning on the transistor Q1 through the resistor R6. Current flows from the power source E, and the light-receiving transistor opposite to it is turned on due to the light emission from the power source E. Then, the resistor R, R is energized by the signal voltage between the control terminals BA and BB, and the transistor Q2 is turned on. By doing so, relay RM
is supposed to work.

Then, when the 2WT5 responds to the off-hook and closes the loop, the power supply E passes through the resistor R3 and the diode DI, and the light emitting diode of the PGA1 is energized.
This emits light to detect loop closure.

Then, the light receiving transistor of PGA1 turns on and drives PG43 with the collector potential at "L" (low level), so that PG43 has a pulse width of, for example, 170 to 5.
A pulse output of 60 m5ec is generated as "L", transistor QI is turned off and the PC441C1 light emitting diode is turned off, and its light receiving transistor is turned off, and transistor Q! Also off as relay RM
be forced to recover.

Therefore, 1 contact rm1Srm2 also has priority over the call request signal, and the output terminals TA and TB are connected to the input terminal KA,
After that, the loop current is passed from KSUl, and KSUI (D LPS17tniyoυ
The loop closure of 2WT 5 is detected, and in response to this, the CPU 14 determines the response of 2WT 5 and EXE 18
Stop sending call request signals via the .

Note that the power supply terminals EA and EB of ADP 7 are connected to the first
It is connected to the 3m signal line as shown in the figure, and the power supplied by this is connected to the IJL source section (hereinafter referred to as PS) 45.
After removing the negative signal components and stabilizing them, i! !
It is shared with each department as @E.

In addition, the main power source of KSUl is generally a commercial power source, which is rectified and stabilized by PS (not shown in the figure) and supplied to each part.

Therefore, even without RGG in KSUi, A
2WT5 or FAX6, answering machine @ or 2-wire standard telephone, etc., 16 by the power port of DD7
Transfer calls to telephone terminals that require H2 calling signals can be made freely, and responses to these calls can be made as well.

In addition, as a telephone terminal, various terminals can be used as long as they require a 16Hz calling signal, and they can be housed on the ST4 side of TSW12, and the line transformer can be installed in TIF131 to 13rn. Similarly, the conditions for the call request may be made in response to not only a transfer call, but also a mutual call with the ST4, various types of alarms, and the like.

In addition, when connecting an external buzzer, - to the connection terminal t3, the sending signal is intermittent, but a switch etc. is provided to indicate whether or not ADP7 is added, thereby changing the control status to CP.
It is up to the user to make various modifications, such as instructing U14.

〔Effect of the invention〕

According to the present invention, which is clear from the above explanation, KS
By being able to make calls to telephone terminals that require a 16 Hz calling signal and to freely respond to them without particularly increasing U, remarkable effects can be obtained in various button telephone devices.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a circuit diagram of a sword attachment device, and FIG. 2 is a block diagram showing the entire configuration. 1...KSU C main unit], 2x, 22...
Outside line, 41-4m...ST (key telephone),
5...2WT (2-wire telephone), 6...FA
X (Facsimile machine), 7・e・・ADP (
Attached sword mouth device), 11+, 11z ・
-・・LIF (outside, I interface), 14
...CPU (processor), 171, 172, 45
...-LPS (loop monitoring circuit), 41...-
・RGG (ringing signal generator), 42.44...PC
(photocoupler), 43...PG (pulse generator),
KA, KB...9th human power terminal, TA, TB...φ
・Output terminal, BA, BB-...control terminal, RMΦ・@
-Relay, rm, rm” @ @ @ 11 contacts, Q+, h...transistor.

Claims (1)

[Claims] 2 by an interface circuit including a loop monitoring circuit.
A ringing signal generator that generates a 16 Hz ringing signal in a button telephone device that connects a wireline telephone terminal to a main device and connects at least the two-wire telephone terminal to an outside line accommodated in the main device; , the output terminal side to which the telephone terminal that requires the 16 Hz calling signal is connected for calling, and the input terminal side connected to the main device are always connected, and the output terminal is connected in response to a calling request from the main device. a switching circuit that switches the terminal side to the calling signal generator side; a loop monitoring circuit that monitors loop closure on the output terminal side when the switching circuit performs the switching; and a loop monitoring circuit that monitors loop closure on the output terminal side when the switching circuit performs the switching; An additional device is provided having a forced recovery circuit that forcibly restores the switching circuit in priority to a request, and the closure of the loop due to a response from the telephone terminal is determined based on the output of a loop monitoring circuit provided in the main device. A button telephone device characterized by: