SU1241487A1 - Subscriberъs connecting device - Google Patents

Abstract

The invention relates to the field of telephone communications. Noise immunity is increased by eliminating communication failure in case of common mode interference. The device contains amplifiers (Y) 1.2 correlator 3, adder 4, pairs {e of resistors 5, 6, 10, 11, transformer 9. The goal is achieved with the introduction of a corrector (K) 7, control unit 8. According to item 2 At 1, 2 execute on the operative inverting and non-inverting at 13, 12. The 12th input of the U 13 through the 5th and 6th resistors is connected to the input of the U 12, The device operates in 2 modes: 2-wire and 4-wire. In the 1st mode, it controls the operation of the K 7-correlator 3, estimating the uncompensated part of the signal from the receiving direction, and controlling the regulators K 7. It adapts the system to the pa3JBf4Hbix parameters of subscriber lines. In 2nd mode, block 8 provides micropower mode Y2. U1 is in normal V mode. Resistors 10, P provide the required input and output resistances, and transformer 9 provides device operability, active elements under common mode interference induced on the subscriber by nearby flushing frequency lines. I zpf-JSh 2 n. ae о S (L with N9 4ib 00 h |

Description

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1241487

The invention relates to telephone

connection and is intended for matching the subscriber's equipment with the communication equipment in the four-wire transit mode and for switching from a two-wire subscriber line to a four-wire one-way communication in one of two directions.

The purpose of the invention is to improve the noise immunity by eliminating the disturbance in the case of common mode interference.

FIG. 1 shows the electrical structural diagram of the subscriber connecting device; in fig. 2 is an electrical block diagram of a first amplifier 1 or a second amplifier 2 ..

The subscriber's connecting device contains the first amplifier 1, the second amplifier 2, the correlator 3, the adder 4, the first resistor 5, the second resistor 6, the correlator 7, the control unit 8, the transformer 9, the third resistor 10, the fourth resistor 11. First amplifier I or the second amplifier 2 contains a non-inverting amplifier 12, an inverting amplifier GZ fifth resistor 14, a sixth resistor 15i

Subscriber connector device operates as follows.

The first and second amplifiers 1 and 2 are made with control inputs and are controllable. The subscriber's connecting device operates in two modes set from the telephone exchange: two-wire and four-wire.

The first mode. The inputs of the correlator 3 and the first, second amplifiers 1 and 2 receive a signal from the receiving direction. At the same time, the control block B provides the micropower mode of the first amplifier 1, at which the signal suppression is more than 66 dB and there is practically no signal at the e and f terminals. From the outputs of the second amplifier 2, switched on by the control unit 8, to the normal amplifier mode via the first, second resistors 5, 6 and transformer 9, the signal enters the subscriber line (pins q and 6). In addition, the signal enters the differential, formed by the first (inverting) and second (non-inverting) inputs, the input of the adder 4, ko2

the input is received from the reception direction (from one of the outputs of the second amplifier 2) which is divided into sub-bands, each of which is adjusted, then the total compensating signal is fed to the third (inverting) input of the adder 4. Controls the operation of the corrector 7 correlator 3, evaluating the part of the signal uncompensated in each subband from the receiving direction and controlling the corrector 7 regulators. Thus, the system is adapted to the parameters of 15 meters of different subscriber lines

Second mode. The control unit B both bakes the micro-power mode of the second amplifier 2, and the signal from the receive direction does not reach the inputs of the adder. From the outputs of the first amplifier 1, which is included in the usual amplification mode, through the third and fourth resistors 10 and 11. The signal goes to terminals 1 and f. The paraphase signal from the subscriber (zazh: IMy a and b) through the transformer 9 arrives at the adder 4 and is converted into an unbalanced signal of the direction of transmission. The resistors provide the required input and output impedances, and the transformer 9 provides the device operability (protection of active elements) under the conditions of the influence of common mode noise induced on the subscriber by nearby industrial frequency lines. The first and second amplifiers 1 and 2 are made with stabilizer-regulators, the outputs of which are the control inputs of the first and second amplifiers 1 and 2.

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Claims (2)

1. The connecting device, containing, its first and second amplifiers, the inputs of which are combined and connected to the first input of the correlator, the second input of which is connected to the output of the adder, the first input of which is connected to the first output of the first resistor, the second output of the adder with the first step of the second resistor, characterized in that, in order to increase the noise immunity by eliminating The second is used to separate the signal from communication 55 with common-mode interference. subscriber. To compensate for the signal from the reception direction at the output of the adder 4, a corrector 7 is designed. At erq, respectively, with the control inputs 0 20 25 1487 2 the input is received from the reception direction (from one of the outputs of the second amplifier 2), which is divided into sub-bands, each of which is adjusted, then the total compensating signal is fed to the third (inverting) input of the adder 4. Controls the operation of the corrector 7 correlator 3 that evaluates the uncompensated portion of the signal in each subband from the receiving direction and controls the corrector 7 regulators. This way, the system is adapted to the parameters of 15 meters of different subscriber lines Second mode. The control unit B provides the micro-power mode of the second amplifier 2, and the signal from the receive direction does not reach the inputs of the adder. From the outputs of the first amplifier 1, which is included in the normal amplifier mode, through the third and fourth resistors 10 and 11. The signal goes to terminals 1 and f. The paraphase signal from the subscriber (zazh: IMy a and b) through the transformer 9 arrives at the adder 4 and is converted into an unbalanced signal of the direction of transmission. The resistors provide the required input and output impedances, and the transformer 9 provides the device operability (protection of active elements) under the conditions of the influence of common mode noise induced on the subscriber by nearby industrial frequency lines. The first and second amplifiers 1 and 2 are made with stabilizer-regulators, the outputs of which are the control inputs of the first and second amplifiers 1 and 2. thirty 35 40 five 0 Invention Formula 1.Abony connecting device, containing, its first and second amplifiers, the inputs of which are combined and connected to the first input of the correlator, the second input of which is connected to the output of the adder, the first input of which is connected to the first output of the first resistor, the second output of the adder is connected to the first output the second resistor, characterized in that, in order to improve noise immunity by eliminating the disturbance corrector and control unit, the first and second outputs of which are connected The first and second amplifiers, the first and second outputs of the second amplifier are connected respectively to the second terminals of the first and second resistors, the first of which are connected to the terminals of the secondary winding of the transformer, and the first and second outputs of the first amplifier are connected to the first outputs of the third and fourth resistors, the second terminal of the second resistor is connected to the input of the equalizer, the first output of which is connected to the third input of the adder, the second inputs of the core The rector is connected to the outputs of the correl - / torus, the third inputs of which are connected to the second outputs of the corrector. 2. The device according to claim 1, wherein the first and second amplifiers are implemented on operating inverting and non-inverting amplifiers, wherein the output of the non-inverting amplifier is connected to the input of the inverting amplifier, the control input of which is through the fifth and the sixth resistors are connected to a controllable input of a non-inverting amplifier. / 2