Device for connecting a computer to a telephone line

 

(57) Abstract:

The invention relates to computing and is designed for interfacing computers over telephone lines. The purpose of the invention is the reduction of hardware costs. The device comprises a channel transceiver 6, block 7 decode address channel transmitter 8, the register 9 data input and output optical matching blocks 10 and 11, a comparator 12, a band-pass filter 13, block 14 protection from impulse noise, block 15 conversion voltage and the block 16 switching. For power bandpass filter, comparator, blocks 10, 11, 14 and 15 used a constant level of voltage in the telephone network. The device provides for the exchange of information between computers over telephone communication channels with a speed of 1200 bit/s 6 Il.

The invention relates to computing and is designed for interfacing personal computers via dial-up or dedicated telephone communication channels.

The aim of the invention is to reduce hardware costs.

In Fig. 1 shows an example of use of the device of Fig.2 is a structural diagram of the device of Fig. 3 is an example implementation of block protection from impulse noise; Fig. 4 algorithm file transfer, and Fig.5 and 6 temporary d computer 1, device 2 to connect the computer to the telephone line, the telephone apparatus 3, and institutional automatic telephone station 4.

The device 2 to connect the computer to the telephone line is connected to the channel 5 computers (Fig.2) and contains channel transceiver 6, block 7 decode address channel transmitter 8, the register 9 data, the input optical termination unit 10, the output of the optical termination unit 11, a comparator 12, a band-pass filter 13, block 14 protection from impulse noise, block 15 conversion voltage and the block 16 switching. Block 14 (Fig.3) contains capacitors 1719 and the diodes 20 and 21.

The device enables data transmission on two-wire dial-up or dedicated channels corporate telephone network or public network with speeds up to 1200 bit/s data Transfer synchronous serial fashion in half-duplex mode using the Manchester code modulation.

The interaction between the two computers when the file transfer is shown in Fig.4. The session begins with a connection over the communication channel. After that one computer is translated in master mode and the other to slave. The further management of the exchange is carried out from the host computer.

In the initial state block 16 switching is set, providing a physical channel between the telephone apparatus 3 and the phone line PBX 4. In order to implement file sharing from any computer network, the user computer picks up the handset of his telephone and establishes a physical channel is free at the moment by another user. Address computer match subscriber numbers telephone network. Installing via ATS physical channel between two telephones and agreed on information exchange, users install the blocks 16 switching their devices in the position that connects the computer to the telephone network. When this terminal voltage with input-output telephone line through the block 16 enters the block 15 conversion voltage and provides the output voltage set the voltage at the input 10 and the output 11 of the optical matching blocks, the comparator 12, the bandpass filter 13, block 14 protection from impulse noise, thereby preparing these blocks to work in the mode of exchange. The supply voltage on the register 9 data channel transmitter 8, block 7 designazione work (in the absence of noise) input the video signal from the telephone line through the block 16 and block 15 conversion voltage information input unit 14 protection from impulse noise, which protects the input of the bandpass filter 13 from the high-voltage noise (signal to interference above 0.7 In) and then passes to the output of the band pass filter 13, which allocates a useful signal from the incoming line signal with a bandwidth of 600-2000 Hz. Output from the bandpass filter 13, the signal is sent via the information input to the comparator 12, which restores the rectangular shape of the signal and transmits the signal to the input of the input optical termination unit 10, which provides electrical isolation between the telephone line of computers and the transformation of the input signal level to the level adopted in the computer. Output input optical termination unit 10, the input signal enters the digit 9 data. The reading of the signal from the register 9 data is carried out according to the standard procedure of reading the computer.

From a PC via the address bus in the channel 5 computer receives the address register 9 data. This address is detectable unit 7 decode address and entrance channel transceiver and register 9 data signal, an enable reading of data from the register. Read data from register 9 data is carried out by the signal reading coming from channel 5 PC via a channel transmitter 8.

If there is by the level of the input signal, this signal is ignored, since the comparator 12 it doesn't, and if the level of interference over half the level of the useful signal, it passes through the comparator 12 and the blocks 10, 9 and 6 in the channel 5 computers and software detected by the method of integration of the input signal. In this case, if the duration of the interference is less than 200 μs, it is recognized by the program, and if more than 200 µs, the interference is perceived as a useful signal and the detection of error is performed as a layer of software in the analysis of the received data block. Timing chart of operation of the device mates with the input data shown in Fig.5.

The output mode. The output information is transmitted from the computer to the phone line bit. The computer puts on the address bus channel 5 PC address register 9 data, and the data bus channel 5 computer transmitted bits. With outputs of the block 7 to decode addresses to the input channel of the transceiver 6 and the first input register 9 data signals which permit the passage of bits of data to the input register 9 data, preparing it for the reception.

Writes the output data bits in register 9 data is performed by the recording signal coming from channel 5 PC via a channel transmitter 8 to the input of register 9 danery provides galvanic isolation of the output of the computer and the telephone line, and convert (attenuation) of the signal level to the level adopted by the International consultative Committee on telephony and telegraphy for voice frequency channels. With unit output 11 output information signal through the block 15 conversion voltage and the block 16 is fed into the telephone line. Timing chart of operation of the device mates with the output data shown in Fig.6.

DEVICE FOR CONNECTING a computer TO a TELEPHONE LINE containing a decryption unit address, the data register, channel transceiver channel transmitter, switching unit, the conversion unit voltage, the comparator bandpass filter, the first input-output of the switching unit is connected to the telephone communication line, the second input-output unit switching an input-output device, the third input-output of the switching unit is connected with the information input-output conversion unit voltage, the output of the bandpass filter is connected to the information input of the comparator, the first and second information input-output channel of the transceiver is connected with the information input-output device and the data register, respectively, the input of which is connected to the first output stroke of the block decode addresses connected to the address input of the input read-write register data through the channel transmitter is connected to the input of the read-write device, characterized in that, in order to reduce hardware costs, it contains the input and output optical matching blocks and block protection from impulse noise, the first output of the conversion unit voltage is connected with the information input unit of protection against impulse noise, the output of which is connected to the information input of the bandpass filter, the output of the comparator is connected to the information input of the input optical matching block, the output of which is connected to the information input of the data register, the output of which is connected with the information input optical output matching unit, the output of which is connected with the information input unit conversion voltage, the second output of which is connected to the inputs for power supply input and output optical matching blocks, comparator, bandpass filter and block protection from impulse noise.

 

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