JPS5890860A - Telephone set connection confirming system - Google Patents

Abstract

PURPOSE:To confirm the connection of telephone set at a subscriber line very easily and economically, by detecting a call signal current flowing through a capacitor of a telephone set bell circuit. CONSTITUTION:In activating a relay RG from a controller, when a telephone set is connected to a subscriber line 11, a call signal current flows through a capacitor of a bell circuit and this current is detected at a call signal detection circuit 10. Further, if no telephone set is connected, no call signal current flows, and then the presence/absence of the telephone set connection can be confirmed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a telephone connection confirmation system in a subscriber line test of a telephone exchange.

As shown in Fig. 1, the conventional telephone connection confirmation system in a telephone exchange connects a DC ammeter 12 to the subscriber line 11, and when a maintenance person operates the telephone key, the capacitor (not shown) of the telephone bell circuit is connected to the subscriber line 11. In this system, the maintenance personnel determined whether the telephone was connected or not by checking the deflection of the pointer of the DC ammeter 12 due to the light flowing through and the discharge current.

However, according to Jin's method, the determination of whether or not a telephone is connected based on the deflection of the pointer is based on the experience and intuition of the maintainer, and has the drawback that the criteria for judgment differs depending on the maintainer. In addition, it required human labor, which was a problem when automating the telephone connection confirmation test.

SUMMARY OF THE INVENTION An object of the present invention is to provide a telephone connection confirmation system which solves the above-mentioned drawbacks by detecting the ringing signal current flowing through the capacitor of the telephone bell circuit using a ringing signal current detection circuit.

In order to achieve this object, the present invention is characterized in that a calling signal current detection circuit is provided in the calling signal sending circuit 1, and the cough calling signal current detecting circuit checks whether or not a telephone is connected to a subscriber line when sending out a calling signal. shall be.

Next, the present invention will be explained with reference to FIG.

Figure 2 is a circuit diagram showing one embodiment of the present invention, in which resistor 1
is a resistor for detecting the calling signal current, capacitor 2 is a DC current blocking capacitor, and diodes 3 to 6 are resistors 1
The diode for rectifying the current from the paging signal source 8 detected by the photocoupler 7 is for electrically separating the paging signal current detection section and the detection information output, and the diode 3 to A calling signal current rectified by 6 flows, and the output on the light receiving side is connected to a control device, thus configuring a calling signal current detection circuit 10. Relay RG is a call signal sending control relay.

In the above configuration, when relay RG is operated by the control device, if a telephone is connected to subscriber line 11, a ringing signal current flows through the capacitor of the bell circuit, and this current is detected by ringing signal detection circuit 10. be done. On the other hand, if the telephone is not connected, the ringing signal current will not flow.
Therefore, it is possible to check whether the telephone is connected.

As described above, the present invention has the effect of making it extremely easy and economical to check the telephone connection in the subscriber line by providing the ringing signal current detection circuit in the ringing signal sending circuit. In addition, since no human intervention is required, it is possible to perform a telephone connection confirmation test in one operation.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a principle diagram of a conventional telephone connection confirmation system, and FIG. 2 is a circuit diagram of an embodiment of the present invention. 1...Resistance for detecting calling signal current, 2...
・DC blocking capacitor, 3 to 6... Diode for detection current 11tIt, 7... Optical coupling element for outputting detection information, Hatake... Calling signal source, 1G...・
...Call signal current detection circuit.

Claims (1)

[Claims] A telephone connection confirmation method, characterized in that a circuit for sending out a discharge signal is provided with a ring signal current detection circuit, and the ring signal current detection circuit checks the telephone connection of a subscriber line when sending out a ring signal.