JPS62132462A - Ringing trip system - Google Patents

Abstract

PURPOSE:To shorten answering time, by connecting an input resistance element for ring trip circuit to a DC power source through a relay contact point on A-line side and connecting the ringing trip circuit to the connecting point of the resistance element and the relay contact point. CONSTITUTION:The ringing trip system of this invention is composed of a ringer transmitter RG 1, DC power source 2, ringing trip circuit 3 connected to A-line side, relay 40, relay contact points 41 and 42, A-line channel 52 connected with the battery 2, B-line channel 51 which is earthed through the ringer transmitter 1, feeding/monitoring circuit 6, subscriber telephone set 7, resistance element 81 for sending ringer, and input resistance element 82 for ringing trip circuit. Since the ringing trip circuit 3 is connected with the connecting point of the relay contact point 42 and input resistance element 82 for ringing trip circuit, ringer signals are transmitted from the transmitter 1 through the telephone set 7 and, accordingly, their AC amplitudes becomes smaller. Therefore, a ringing trip system which is less in the number of parts to be used and can quickly cope with a change in DC can be obtained.

Description

[Detailed Description of the Invention] [4 Already Required] This is a ring trip system in which a ring trip circuit is connected to the A line side of the subscriber circuit via a ringer contact to reduce the number of parts.

[Industrial Application Field] The present invention relates to a ring trip system in which a ring trip circuit is connected to the A line side in a subscriber circuit of an exchange.

[Prior Art] In the subscriber circuit of an exchange, the configuration shown in FIG. 3 is well known. In FIG. 3, the communication line connecting the -48V battery is abbreviated as line A, and the communication line connecting the ring trip circuit is abbreviated as line B. 1 is a ringer transmitter, 2 is a DC power supply ■
, 3 is a ring trip circuit RTP, 40 is a relay, 41
．． 42 is the relay contact rt', rt'', 51 is B
52 is an A line, 6 is a power feeding/monitoring circuit, 7 is a subscriber's telephone, and 81.degree. 86 is a resistance element. Note that FIGS. 4A and 4B both show specific circuit diagrams of the ring trip circuit of FIG. 3. In FIG. 3, called subscriber telephone 7 Herringer transmitter 1
When telephone 7 goes off-hook while transmitting the output of
detects this and issues a trip signal to operate relay 40, causing contacts 41 and 42 to move to the opposite position from the illustrated position. As a result, the output of the ringer transmitter l is not sent to the telephone a7.

Resistance elements 81 and 86 protect the ringer oscillator 1 and battery 2 against faults caused by ground faults in the A and B lines, respectively, and operate as fault detection elements. It serves as an input resistor.

In FIG. 4A, a resistor 83 and a capacitor 84 form an integrating circuit, and are input to one terminal of a comparator 85. A threshold voltage vth is input to the other terminal of the comparator 85. When detecting that the ringer oscillator output and the DC voltage are superimposed on the terminal, that is, that the threshold voltage is exceeded following the off-hook of the telephone 7, the comparator circuit 85 outputs a trip signal. Fourth
Also in Figure B, the diode D21. When an input exceeding a predetermined threshold voltage is detected in combination with D22, the photocoupler PC is operated to generate a trip signal.

[Problems to be Solved by the Invention] In the ring trip circuit shown in FIG. 4A, it is necessary to make the time constant of the integrating circuit large and the value of the capacitor 84 extremely large in order to prevent malfunction. As a result, the handset and receiver of telephone N7 went off.

There was a drawback that it took a long time to get the trip signal after the trip signal was released.

Further, in FIG. 4B, the number of components such as resistive elements, diodes, and photocouplers is large, and the adjustment is complicated.

SUMMARY OF THE INVENTION An object of the present invention is to improve the above-mentioned drawbacks and provide a ring trip method with a simple configuration and short response time.

[Means for solving problems] FIG. 1 is a circuit diagram showing the basic configuration of the present invention.

In Fig. 1, ■ is the ringer oscillator RG, 2 is the DC power supply, 3 is the ring trip circuit connected to the A line side,
40 is a relay, 41.42 is a relay contact rt', r
t", 52 is the A line and is the communication line to which battery 2 is connected,
51 is a B line, which is a communication line that is grounded via a ringer transmitter;
Reference numeral 6 indicates a power supply/monitoring circuit, 7 a subscriber telephone, 81 a ringer sending resistance element, and 82 an input resistance element for a ring trip circuit.

[Function] Since the ring trip circuit 3 is connected to the connection point between the relay contact 42 (rt") and the ring trip circuit human resistance element 82, the ringer signal passes through the telephone 7 through the transmitter l, so its AC amplitude is It is smaller than the conventional circuit. Therefore, the time constant of the ring trip circuit may be made small.

[Example] FIG. 2 is a diagram showing a specific circuit configuration of the ring trip circuit 3 of FIG. 1. An example of the value of the input resistance element 82 for the ring trip circuit in FIG. 2 is 200 to 300.
Ω, an example of the value of the ringer sending resistance element 81 is 1Ω, and an example of the value of the ring trip circuit integrating circuit resistance element 83 is 10.
0 kΩ to 200 kΩ, example value of Capacity-Crab 84 is 0.1
~0.5 μF (the conventional value is about 10 μF). In particular, the capacitance value can be reduced to about 1/20 of the conventional value.

Therefore, the time constant of the circuit constituted by the resistor 83 and the capacitor 84 becomes small, so that the response speed to DC changes becomes faster.

[Effects of the Invention] In this way, according to the present invention, the number of parts is small,
In addition, a ring trip method with a fast response speed to DC changes can be obtained.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing the basic configuration of the present invention, FIG. 2 is a diagram showing a specific example of the ring trip circuit in FIG. 1 as an embodiment of the present invention, and FIG. 3 is the configuration of a conventional subscriber circuit. Figure 4A shows
B is a diagram showing a specific example of the circuit shown in FIG. 3; 1 - Ringer transmitter 2 - DC power supply 3 - Ring trip circuit 41. 42 - Relay contact 51 - B line, 52 - A line 7 - Subscriber telephone 81 - Ringer signal transmission Resistance element 82- Ring trip circuit input resistance element Patent applicant
Fujitsu Limited Representative Patent Attorney Eisuke Suzuki Figure 2 Figure 3 Figure 4 B Figure 4 A

Claims (1)

[Claims] A series circuit of a ringer transmitter (1) and a ringer signal sending resistance element (81) is connected to the B line (51) side of the subscriber circuit via a relay contact (41), and the A line (52) side through the relay contact (42) to the ring trip circuit input resistance element (
82) and the DC power supply (2), and the resistance element (82) is connected to the DC power source (2).
) and the relay contact (42) are connected to a ring trip circuit (3).