CN2187356Y

CN2187356Y - Wire-wireless-wire adapter

Info

Publication number: CN2187356Y
Application number: CN 93247323
Authority: CN
Inventors: 徐佑民; 石建民
Original assignee: Xian Jiaotong University
Current assignee: Xian Jiaotong University
Priority date: 1993-12-31
Filing date: 1993-12-31
Publication date: 1995-01-11
Anticipated expiration: 2003-12-31

Abstract

The utility model discloses a switching device which uses a wireless channel to connect with two wire telephone networks automatically in the field of the communication technique. The utility model comprises a machine picking and hanging control circuit, a frequency locking circuit, a single chip computer, an analogue key board, a coding decoding circuit, and a ringing current testing circuit in the machine picking and hanging control circuit. A machine picking / hanging circuit and the frequency locking circuit are connected with the I/O opening of the single chip computer. A 2/4 wire converter is connected with a radio set interface. The coding decoding circuit is composed of a code device, a decoding device, and the analogue key board. The utility model has the advantages of low cost, quick networking, and convenient maintenance.

Description

Wire-wireless-wire adapter

The utility model belongs to communication technique field, further relates to a kind of switching device that two automatic tandems of cable telephone network is got up with wireless channel.

Make subscriber's extension station (telephone set) number dialing telephone call mutually on two telephone exchanges of apart from each other, common way is with microwave equipment or cable they to be linked up, but these method cost height, the construction period is long, and cable is easily destroyed, and is difficult in maintenance.

The purpose of this utility model is to provide a kind of switching device, and by the ultrashort wave channel with two automatic tandems of exchanger user together, it has, and cost is low, and networking is fast, characteristics easy to maintenance.

The utility model comprises to be plucked/the on-hook control circuit, single-chip microcomputer, indicating circuit, pluck/bell ripple testing circuit in the on-hook control circuit with pluck/the on-hook circuit connects the single-chip processor i/o mouth respectively, 2/4 line converter links to each other with radio interface.Amplifier input terminal connects 2/4 line converter in the frequency locking circuit.Coding-decoding circuit is made up of encoder, decoder and simulating keyboard, and coding-decoding circuit links to each other with single-chip microcomputer by data wire.The output of coding circuit, the input of decoding circuit links to each other with radio interface.Indicating circuit with single-chip microcomputer, decoding circuit, frequency locking circuit, pluck/the on-hook circuit, power supply is connected.

Below in conjunction with accompanying drawing the utility model is further described.

Fig. 1 is the utility model overall structure block diagram.

Fig. 2 plucks/on-hook control circuit block diagram for the utility model.

Fig. 3 plucks/on-hook control circuit schematic diagram for the utility model.

Fig. 4 is the utility model frequency locking circuit theory diagrams.

Fig. 5 is the utility model coding-decoding circuit schematic diagram.

The utility model plucks/bell flowing detecting circuit 12 in the on-hook control circuit 1 with pluck/on-hook circuit 9 connects single-chip microcomputer 4I/O mouth respectively, 2/4 line converter 10 links to each other with radio interface 3.Frequency locking circuit 2 is made up of an amplifier and a frequency locking device, and 4 one I/O mouths of frequency locking device output and single-chip microcomputer link to each other, and amplifier input terminal connects 2/4 line converter.Coding-decoding circuit 6 is made up of encoder, decoder and simulating keyboard 5.Indicating circuit 7 with single-chip microcomputer 4, decoding circuit, frequency locking circuit 2, pluck/on-hook circuit 9, power supply 8 is connected.The input of isolator 13 is connected to 2/4 line converter 10, and output is connected to analog switch group 11, and analog switch group 11 and radio interface and 2/4 line converter 10, isolator 13 are connected.

Pluck/diode D in the on-hook control circuit 1 ₁₁With resistance R ₁₂Parallel connection again with resistance R ₁₁, capacitor C ₁₁Connect the back cross-over connection on subscribers feeder, the input of photoelectrical coupler and resistance R ₁₂Parallel connection, output are received between the input port and ground wire of single-chip microcomputer 4.Above circuit has been formed bell flowing detecting circuit 12.Bridge rectifier Q ₁₁The input cross-over connection in the subscribers feeder two ends, output is received relay J respectively ₁₁On two groups of switch reeds, Q ₁₁Subscribers feeder is shielded.Relay J ₁₁Line bag and diode D ₁₂Parallel connection again with light-emitting diode D ₁₃, resistance R ₁₃Be in series triode BG ₁₂Grounded emitter, collector electrode connecting resistance R ₁₃, resistance R ₁₄An end and triode BG ₁₂Base stage links to each other, and the other end connects a delivery outlet of single-chip microcomputer 4.Relay J ₁₁Another termination positive source.Relay J ₁₁Two groups of reeds link to each other with two line ends of bridge rectifier and 2/4 line converter respectively, more than formed and plucked/on-hook circuit 9.Capacitor C ₁₂With resistance R ₁₅Back cross-over connection in parallel is in relay J ₁₁On the normal opened contact of two groups of reeds, potentiometer W ₁₁One end and relay J ₁₁A normal opened contact links to each other the other end and transformer B ₁₁Primary coil one end link to each other, another normal opened contact of the other end of transformer and relay is connected.Resistance R ₁₆One terminate at transformer B ₁₁On the primary coil centre cap, the other end is connected to resistance R ₁₅, potentiometer W ₁₁, capacitor C ₁₂Common port on.Transformer B ₁₁Secondary being connected between analog switch group 11 and the ground.Transformer B ₁₂Primary coil and C ₁₃Be connected across resistance R after the series connection ₁₆Two ends, secondary coil B ₁₂Be connected between analog switch group 11 and the ground.

Operational amplifier LM324 input in the frequency locking circuit 2 and transformer B ₁₂Secondary continuous, output and capacitor C ₂₂, R ₂₃The series connection back links to each other with frequency locking device LM567 the 3rd ' pin, and frequency locking device LM567 the 1st ' pin connects capacitor C ₂₄Positive pole, 2 ' pin connects capacitor C ₂₃Positive pole, capacitor C ₂₄With C ₂₃Negative pole all be connected to ground wire, frequency locking device LM567 the 4th ' pin connects power positive end, the 5th ' pin and resistance R ₂₄, potentiometer W ₂₁, capacitor C ₂₆Series connection, capacitor C ₂₆Other end earth connection, the 6th ' pin meets potentiometer W ₂₁With capacitor C ₂₆Common port.7 ' pin earth connection, 8 ' pin and light-emitting diode D ₂₁, resistance R ₂₅Series connection, resistance R ₂₅Another termination power positive end, capacitor C ₂₅Connect between the 8 ' pin and ground of frequency locking device LM567,8 ' pin also is connected with an input port of single-chip microcomputer 4.

Fig. 5 is a coding-decoding circuit, and wherein coding circuit is made up of with IC31, WE9187 simulating keyboard 5; Decoding circuit is by IC32, and MT8870 forms.

In the coding circuit the 3rd of four of simulating keyboard 5 alignments and WE9187 the ', 4 ', 5 ', 9 ' pin links to each other.WE9187 the 16th ' pin and resistance R ₃₁And potentiometer W ₃₁An end link to each other potentiometer W ₃₁Other end ground connection, tap meets the PH AUDIO in radio station.Resistance R ₃₁The SP OUT in another termination radio station, 7 ' pin meets crystal JT31 between the 8 ' pin.

In the decoding circuit the 15th of MT8870 the ', 14 ', 13 ', 12 ', 11 ' pin links to each other with the data wire of single-chip microcomputer 4,15 ' pin links to each other with the base stage of 10 ' pin and triode BG31, the collector electrode of BG31 meets power supply V _CC, emitter and resistance R ₃₅, light-emitting diode D ₃₁Polyphone, light-emitting diode D ₃₁Other end ground connection.MT8870 the 5th ', the equal ground connection of 6 ' pin, resistance R ₃₂Be connected between 2 ' pin, the 3 ' pin potentiometer W ₃₂An end link to each other the other end and capacitor C with its tap and 2 ' pin ₃₁Link to each other C ₃₁The RADIO RX in another termination radio station.MT8870 the 1st ' pin links to each other crystal JT32 and resistance R with 4 ' pin ₃₃And be connected between 7 ', the 8 ' pin resistance R after connecing ₃₄Be connected between 16 ' pin, the 17 ' pin capacitor C ₃₂One be terminated at 17 ' pin, the other end is connected to power supply V _CC

Simulating keyboard 5 is connected with encoder and single-chip microcomputer 4 respectively by data wire in the coding-decoding circuit 6.The output of encoder links to each other with the modulated terminal of posting a letter of radio interface 3.Decoder links to each other with the single-chip data line, and the input of decoder links to each other with the collection of letters output of radio interface 3.

The utility model can be used for the occasion that the user on the switch of two apart from each others need be coupled together, as is used for the rural telephone system, and mineral bureau communicates by letter with each ore deposit, and power office communicates by letter with large-scale substation.This device also can be used for the mountain area radio communication, and for example using between traditional method A, the B two places can not direct communication, need set up trunk desk on the mountain, adopt this device and little transcriber after, A, B two places get final product direct communication.

Claims

1, wire/wireless/wire commutator, it comprises plucks/on-hook control circuit, single-chip microcomputer, indicating circuit, it is characterized in that: described plucking/on-hook control circuit by a bell flowing detecting circuit, pluck/on-hook circuit and 2/4 line converter form, bell flowing detecting circuit with pluck/the on-hook circuit connects the single-chip processor i/o mouth respectively, 2/4 line converter links to each other with radio interface; The frequency locking circuit is made up of amplifier and frequency locking device, and I/O mouth of frequency locking device output and single-chip microcomputer links to each other, and amplifier input terminal connects 2/4 line converter; Coding-decoding circuit is made up of encoder, decoder and simulating keyboard, and coding-decoding circuit links to each other with single-chip microcomputer by data wire; The output of coding circuit, the input of decoding circuit links to each other with radio interface; Described indicating circuit with single-chip microcomputer, decoding circuit, frequency locking circuit, pluck/the on-hook circuit, power supply is connected.

2, wire/wireless/wire commutator as claimed in claim 1 is characterized in that: amplifier input terminal and transformer B in the described frequency locking circuit ₁₂Secondary continuous, output and capacitor C ₂₂, resistance R ₂₃The series connection back links to each other with frequency locking device LM567, and phase locking unit LM567 the 1st ' pin connects capacitor C ₂₄Positive pole, 2 ' pin meets C ₂₃Positive pole, capacitor C ₂₄With capacitor C ₂₃Negative pole all be connected to ground wire, frequency locking device LM567 the 4th ' pin connects power positive end, the 5th ' pin and resistance R ₂₄, potentiometer W ₂₁, capacitor C ₂₆Series connection, capacitor C ₂₆Other end earth connection, 6 ' pin is connected to W ₂₁With capacitor C ₂₆Common port, 7 ' pin ground connection, 8 ' pin and light-emitting diode D ₂₁, resistance R ₂₅Series connection, resistance R ₂₅The other end is connected to power positive end; Capacitor C ₂₅Be connected between the 8 ' pin and ground of frequency locking device LM567,8 ' pin also is connected with an input port of single-chip microcomputer 4.