CN2433787Y

CN2433787Y - Automatic 112 testing junction box for telephone

Info

Publication number: CN2433787Y
Application number: CN 99207420
Authority: CN
Inventors: 范必武; 侯建生
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-04-08
Filing date: 1999-04-08
Publication date: 2001-06-06
Anticipated expiration: 2009-04-08

Abstract

The utility model relates to an automatic 112 testing junction box for a telephone, which can use a zero passage detection control circuit to test zero passage signals at the time when 112 starts a test and to control the conduction of a G2 triode to make a relay attract and realize automatic changes of line terminal loads. When the test is completed, the utility model can cause a triode G1 to be conducted by a delaying control circuit and drive the relay to switch and return to the original state. The utility model has the advantages of quick and accurate test to data, convenient line detection and maintenance for telecommunication departments and convenient communication for users, which is regarded as a device worth being used widely.

Description

The automatic subscriber line test terminal box of phone

The automatic subscriber line test terminal box of phone relates to the servicing unit to communication line test and telephone subscriber's wiring.

Telecommunication department is trouble shooting or the proper communication that guarantees the telephone subscriber, and 112 systems must test communication line, in time grasp the operation conditions of communication line.Because user load kinds such as the phone of line terminal or facsimile machine are more, and often break down, and influenced the test effect.Present subscriber line test terminal box, need with manually the phone plug being extracted from the terminal block receptacle mouth, when phone is extracted, touch switch closure in the terminal box is connected on the mock standard load on the telephone line, for 112 system testings, if test finishes, all are normal, manually the phone plug are inserted the line box again, could normal talking.

The purpose of this utility model is to provide a kind of phone automatic subscriber line test terminal box, and when it carried out line test in telecommunication department 112 systems, finishing the line terminal load automatically was the mock standard load by the user load switching; And after test is finished, again can the load of automatic disconnection mock standard, revert to user load.

The utility model mainly is made up of box body and circuit part.The input of device is connected with the pair of telephone lines road by the binding post on the printed circuit board (PCB) in the box body, and the output loading end is connected with user loads such as phone or facsimile machines by the socket on the box body.

Circuit part mainly comprises the mock standard load, bridge rectifier, zero passage detection control circuit, delay control circuit, relay and drive circuit.The mock standard load is when carrying out subscriber line test, replacement user load access telephone line terminal.Bridge rectifier is when connecting this device for telephone line, need not select the voltage positive-negative polarity to establish, and whether the zero passage detection control circuit is to detect 112 systems to test.Delay control circuit is when guaranteeing test mode, to have time enough to finish test.Relay and drive circuit are when testing, and make user load switch to the mock standard load automatically, when test finishes, make the mock standard load switch to normal operating condition setting automatically.

A kind of embodiment that provides in conjunction with the accompanying drawings further specifies the operation principle of this device.

Fig. 1 is the automatic subscriber line test terminal box of a phone electrical schematic diagram.

In Fig. 1, the 1st, the mock standard load, the 2nd, the zero passage detection control circuit, the 3rd, delay control circuit, J are relays, and G is a triode, and D is a diode, and R is a resistance, C is an electric capacity.Relay J and G ₁, G ₂Triode is formed relay and drive circuit, and bridge rectifier and diode D, resistance R, capacitor C are formed the commutation supply voltage circuit.Telephone line is connected with the relay J central point of in input among Fig. 1, and user load and output OUT two ends are connected to a contact of relay J, simulates standard termination and is connected on the b contact of relay J.The a contact of bridge rectifier input and relay also connects.Its output negative terminal is a common port, it and C ₁One end, C ₂One end, G ₁, G ₂The emitter of triode, zero passage control circuit ground end, delay control circuit ground end connects altogether.Bridge rectifier output plus terminal one tunnel is connected to the Zero cross controller input, another road through resistance R respectively with D ₁C ₁And D ₂C ₂To negative terminal formation loop, zero passage control circuit and C ₁Parallel connection, export one the tunnel with the G of drive circuit ₂Base stage links to each other, and another road links to each other with the delay control circuit input, and delay control circuit is attempted by C ₂Two ends, its output and drive circuit G ₁Base stage link to each other the G of drive circuit ₂Meet D after the collector electrode string relay J ₁Negative terminal, the G of drive circuit ₁Meet D after the collector electrode string relay J ₂Negative terminal.

At normal operating condition, the 48V left and right sides direct voltage that telephone line is sent here is through relay contact a end, and one the tunnel arrives the output loading end uses for telex network; Another road is exported again through resistance R, diode D by rectifier to bridge rectifier ₁, D ₂To capacitor C ₁, C ₂The static working current of each circuit in charging and the generator.When telecommunication department 112 systems carried out line test, voltage was tested after earlier reducing to OV by 48V again on the telephone line, when line drop near OV the time, the zero passage detection control circuit detects the zero cross signal of being sent here by bridge rectifier, and control G ₂The triode conducting, capacitor C ₁Both end voltage is through relay coil and G ₂The relay adhesive is ordered about in the loop, and the relay central contact switches to the b contact from a contact.Like this with regard to the automatic disconnection user load and with mock standard load line attachment terminal, and to remain to test at this state always and finish, guaranteed test data accurately.The double-wound relay that the utility model embodiment adopts does not need to keep electric current and keeps attracting state, if want the reinstatement attitude then to need to add the reverse conversion electric current on another coil.When relay switches to test mode, delay control circuit is started working, and fully satisfy subscriber line test required time more than 20 seconds its time of delay, after the control time to be postponed arrives, promptly controls G ₁The triode loop drives returning and a terminal contacts connection status of relay, and having finished the line terminal again automatically is user load by the mock standard load transfer, returns to normal communication state.

The utility model need not to pull out, insert user load just can be according to the needs of telecommunication department test and telex network, automatically realize the conversion of line terminal load, having guaranteed the quick, accurate of test data, made things convenient for telecommunication department and user, is the attachment device of well communicating by letter.

Claims

1. the automatic subscriber line test terminal box of phone is made up of box body and circuit part, it is characterized in that zero passage detection control circuit (2) input links to each other with the bridge rectifier output plus terminal in the circuit, its export one the tunnel with the G of drive circuit ₂Base stage links to each other, and exports another road and links to each other zero passage detection control circuit (2) two ends and C with delay control circuit (3) input ₁Parallel connection, the output of delay control circuit (3) and the G of drive circuit ₁Base stage links to each other, delay control circuit (3) and C ₂In parallel.

2. the automatic subscriber line test terminal box of phone according to claim 1 is characterized in that a contact and the user load of relay J and connects, the b contact with simulate standard termination (1) and connect.