JPH0233221B2 - KAISENBUNRIKI - Google Patents

Description

[Detailed Description of the Invention] The present invention enables, when an external fault occurs in a telephone line, the central office to accurately determine whether the fault is caused by a fault in the line or a fault in the in-house equipment. , relates to a line separator that is installed between a subscriber protector at a line terminal and an in-home device, and switches the line by remote control in order to test the content of the fault.

Conventionally, this type of line separator did not exist, so when a line fault occurs or a failure occurs in the customer equipment, the central office must first measure the insulation resistance, capacitance, and DC resistance of the subscriber line. In addition, because it is necessary to perform a call test by calling the subscriber, it is often difficult to distinguish between faults in the line and equipment in the premises. Therefore, when a repair person is dispatched, he or she must carry a large variety of repair tools and materials. In addition, searching for the cause of the failure was a major loss of time and effort.

The present invention was made in view of the above circumstances, and
In the event of an emergency disaster or a line failure reported by a subscriber, the subscriber's line can be tested by remote control from a test stand at the telephone office in order to test whether the failure point is on the line side or on the customer equipment side. By separating the in-home equipment from the terminal and testing only the line, it becomes easier to discover the cause of the failure, and the demarcation of responsibilities for repairs becomes clear, eliminating unnecessary dispatch of repair personnel. , saving labor costs;
The purpose of the present invention is to provide a line separator that can help shorten repair time and improve service.

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a telephone line, in which a telephone office 2 having a DC power supply 1 is connected by a line 3 to an in-home device 5 via a subscriber protector 4. As shown in FIG. A line separator 6 is inserted and connected between the in-home device 5 and the subscriber protector 4.

FIG. 2 shows an example of a line separator 6, in which the anodes of diodes 11 and 12 are connected to the connection ends 7 and 8 to the subscriber protector via protective resistors 9 and 10. The cathode is connected to the base of switching transistor 13 and to the anode of diode 14.
The cathode of this diode 14 connects two relays 1
5 and 16 in series to the emitter of the transistor 13, and an electrolytic capacitor 17.
The other end of the capacitor 17 is connected to the collector of the transistor 13.
The collector of this transistor 13 is connected to the ground terminal 18 of the subscriber protector, and a resistor 33 is connected between the collector and base of the transistor 13. Contacts 161, 162 of the relay 16 are provided on the telephone line between the connection ends 7, 8 to the subscriber protector and the connection ends 19, 20 to the home equipment, and the contacts 161, 162 are used to switch and connect. Contacts 151 and 152 of the relay 15 are provided in the short circuit between the connection ends 7 and 8. That is, the movable contact piece 21 of the contact 161 is connected to the connection end 7, and the first fixed contact 22 of this contact 161 is connected to the connection end 19. The second contact point 161
The fixed contact 23 of is connected to the second fixed contact 24 of the contact 151, and the first fixed contact 25 of this contact 151 is an empty contact. The movable contact piece 26 of the contact 151 is connected to the movable contact piece 27 of the contact 152, and the first fixed contact 28 of this contact 152 is an empty contact. The second fixed contact 29 of the contact 152 is connected to the second fixed contact 30 of the contact 162, and the first fixed contact 31 of the contact 162 is connected to the second fixed contact 30 of the contact 162.
is connected to the connection end 20, and the movable contact piece 32 of this contact 162 is connected to the connection end 8.

That is, on the telephone office 2 side, a DC voltage of, for example, 100 V is applied for several seconds between the line of the faulty line (one of the two lines) and the ground. This DC voltage is
After passing through, protective resistors 9, 10 and diode 1
1, 12, and 14 to charge the electrolytic capacitor 17. During this charging process, the transistor 13 is reverse biased by the forward voltage of the diode 14 and is in an off state. Now, if you turn off the power at the station,
A part of the amount of charge charged in the capacitor 17 is supplied to the transistor 13 as a base current via the resistor 33, and the transistor 13 is turned on. Relays 15 and 16 operate due to the discharge current of capacitor 17, and relay contacts 151, 152, 161, 162
, and the movable contact pieces 26, 27, 21, 32 are connected to corresponding second fixed contacts 24, 29, 2, respectively.
3 and 30, the indoor device 5 is separated from the line, and the line is short-circuited. After about 15 seconds, the relay 15 with the higher open voltage is automatically restored first, the relay contacts 151 and 152 are restored, and the movable contacts 26 and 27 are connected to the first fixed contacts 25 and 28. and the line is opened. Approximately 10 seconds after the relay 15 is restored, the relay 16 with the lower open voltage is automatically restored, the relay contacts 161 and 162 are restored, and the movable contacts 21 and 32 are connected to the first fixed contact 2.
2 and 31, and the in-home equipment 5 is connected to the track as before, returning to the normal state. In this way, by the charging/discharging mechanism of the electrolytic capacitor 17, the relays 15, 1
6 is activated and the line is turned on and off at set time intervals to short-circuit and open the output side and perform a line test.

As described above, according to the present invention, it is possible to separate the customer's home equipment from the terminal of the subscriber's line by remote control from the test stand at the telephone office and test only the line. Therefore, in the event of an emergency disaster or line failure reported by a subscriber, it will be easier to discover the cause of the failure, whether the point of failure is on the track side or on the in-house equipment side, and the demarcation of responsibility for repairs will be clarified. Therefore, unnecessary dispatch of repair personnel can be avoided, which can help save labor costs, shorten repair time, and improve service. Further, since the capacitor is charged with a constant applied voltage regardless of the length of the line, there is an advantage that the relay can be operated reliably.

[Brief explanation of drawings]

FIG. 1 is a configuration explanatory diagram showing an example of a telephone line according to the present invention, and FIG. 2 is a circuit diagram showing an embodiment of a line separator according to the present invention. 1...DC power supply, 2...Telephone office, 3...Line,
4... subscriber protector, 5... home equipment, 6... circuit separator, 13... switching transistor,
14...Diode, 15,16...Relay, 1
7... Electrolytic capacitor.

Claims (1)

[Claims] 1. A capacitor is connected between the subscriber protector of the telephone line and the in-home equipment, and is charged through the telephone line by applying a DC voltage between the line of the faulty line and the ground at the central office side for a predetermined period of time, and a switch is connected between both ends of this capacitor. 1. A line separator, which is connected through a switching transistor, and is operated by the discharge current of the capacitor to isolate a home device from the telephone line, as well as to short-circuit and open the telephone line, with relays having different recovery times.