SU1352660A1 - Device for monitoring attenuation in communication of multichannel signal - Google Patents

Abstract

The invention relates to telecommunications and reduces the attenuation time of communication channels. The device contains software block 1, measuring generator 2, adjustable quadrupole 3, threshold block 4, control block 5, measuring block 6, switching element 7 on the transmitting side, adjustable quadrupole 8 on the receiving side, threshold blocks 9, 12. and 16, control unit 10, elements II and 14, NOT element 13, switch 15,: operating mode setting unit 17, switching element 18, indicator 19, delay elements 20 and 22, decoder 21, input 23 and output bus 24. 1 3.p. f-ly, 1 silt, and / 7 / f oo joint venture rsD Oi about: o

Description

The invention relates to telecommunications and can be used in monitoring the residual attenuation of communication channels.

The purpose of the invention is to reduce the attenuation time of the communication channels.

The drawing shows the structural electrical circuit of the device for controlling the attenuation of communication channels

The device for monitoring the attenuation of the communication channels contains on the transmitting side the program block 1, measuring generator 2, adjustable quadrupole 3, threshold unit 4, control unit 5, measuring unit 6, switching element 7, on the receiving side - adjustable1) W quadrant 8, first threshold unit 9, control unit 10, first element 11, second threshold block J2j element 13, second element 14, switch 15, third threshold block 16, operation mode setting block 17, switching element 18, indicator 19p first element 20 delay ,, de encoder 21, second delay element 22, input bus 23. output bus 24.

The mode setting unit 17 comprises the first element NOT 25, the first element AND 26, the second element NOT 27, the delay element 28 the second element AND 29, the first element OR 30, the first pulse generator 31, the second driver 32 pulse, the trigger 33, the second element OR 34, the third element And 35,

The device for controlling the attenuation of the communication channels operates in the following 1 way.

By pressing a button (not shown), the switching element 7 is placed in the position of transmitting the measuring signal directly from the output of the measuring generator to the input of the direct channel (PC). At the same time, a clock pulse from a program block t (for example, a positive polarity) to the input of measuring generator 2 sets the measurement signal; the signal of the nominal level and a certain frequency (for example, 800 Hz frequency when monitoring the tone frequency channels of the PM); comes with a level determined by the attenuation of the test channel. Suppose that the PC attenuation is less

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nominal value, m, e, the measurement signal is fed to the output of the PC with a level above the nominal value. At this signal level, the first is triggered, - the second and third threshold blocks 9, 12 and 16,

The signal 1 from the third threshold unit 16 is fed without delay to the first input of the operating mode setting unit 17 and further, to the combined inputs of the second elements HE 27 and AND 29 and the second driver 32 pulses. The signal inverted by the second element NOT 27 is fed to the second input of the second element AND 29 and prohibits the passage of a short signal that arrives with a delay determined by the first delay element 20 to the first input of the second element AND 29 from the first output of the first threshold unit 9. At the same time from the leading edge of signal 1, tupivshego shaper 32 to the second input pulse, a short pulse is formed, which passage through the AND gate 35 is determined by the delay element 28. This impulse comes through a serially connected third element AND 35 and the second element OR 34 to the first input of the trigger 33, setting the latter to the position at which the first output of the operating mode setting block 17 receives (for example, l), from which the switching element 18 operates and The decoder 21 is turned on. From signal 1 at the first output of the mode setting unit 17, the first element AND 26 is turned on, the first input of which already receives the signal I and generates a signal at the second output of the mode setting unit 17, Formed This signal arrives at the first input of control unit 10. At the output of control unit 10, a short impulse (on; - example, negative polarity) is formed on the leading edge of this signal, with which the adjustable quadrupole 8 is set to the maximum attenuation position. Then, from the output of control unit 10, a signal sequence l arrives at the second input from the second element I 14, which transmits a sequence of positive polarity pulses at a higher frequency than the same impulses come from control unit 5 to the input of the regulated quadripole 3, Admission and the number of pulses with such an increased frequency leads to a more rapid change (decrease in attenuation) of the attenuation of the adjustable quadrupole 8, as a result of which the level of the measuring signal at the output of the latter changes much faster. As soon as the level of the measuring signal at the input of the second threshold unit 12 reaches its nominal value, the latter is triggered and sends a signal 1 to the first input of the control unit 10 via the serially connected element ION 3 and the second element 11-14 as an O signal to stop feeding the pulse sequence to the second input an adjustable quadrupole 8 and thereby terminating the process of controlling its damping. At the same time, the signal arrives at the first input of the indicator 19, to the fourth input of which the corresponding signals have already arrived from the decoder 21, monitoring the states of the adjustable quadrupole 8. In the indicator 19, using signals received from the decoder 21 and the second threshold unit 12, an estimate is generated attenuation of the test channel. If the attenuation is normal (B tolerance), the estimate is not displayed, but the second output of the indicator 19 receives the generated signal 1 and then the third input of the first element 11, the first input of which received the signal 1 from the second threshold unit 12, and on. the second - from the third threshold unit 16, the signal 1 will go through the second delay element 22; the presence of the signal 1 at all three inputs of the first element 11 of signal 11 produces a signal 1 at its output, which is fed to the control input of the switch 15, as a result of which Wow, the measurement signal from the input of the switch 15 comes from its output to the input of the return channel OK with a nominal level. The OK signal outputs the measurement signal with a certain delay and level, it depends on the attenuation of the OK signal. From the leading edge of the signal at the OK output, the threshold unit 4 operates and sends a signal to the control input of the measuring unit 6 for evaluation

Ok to match up

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fading start.

When the next clock pulse arrives, for example, a positive polarity from the program unit 1, the measurement signal is disconnected from the measurement generator 2 output, the next frequency is set, and then, with some delay, the measurement signal is supplied with the newly set frequency through the switching element 7 to the PC input, The removal of the measuring signal at the PC input leads to the removal, but with some delay, determined by the PC, of this signal at its output, which leads to a corresponding triggering threshold blocks (second 12, first 9 and third 16) that generate a signal O at their outputs instead of a signal 1. As a result of the first threshold block 9 triggering, a signal O is received at the third input of the mode setting unit 17, which is then inverted in mode setting unit 17 operation of the first element NOT 25 and from the leading edge of the inverted signal 1, the first driver 31 of the pulses generates a short pulse that through the first element OR 30 enters the second input of the trigger 33, sets it to its initial state, as a result At the first output of the operating mode setting block 17, the signal O appears instead of 1. The appearance at the control input of the switching element 18 of the signal O instead of 1 causes the switching element 18 to return to its initial position at which the PC output connects directly through the switching element 18 with the combined inputs of the second porous block 12 and the switch 15. At the same time, the signal O is generated at the first input of the control unit 10, which prohibits further adjustment of the regulated quadripole 8,

When a measuring signal arrives at the PC output, the monitoring process is repeated.

When, after stopping the regulation of the regulated quadrupole .8, a signal is sent by the decoder 21 to the fourth input of the indicator 19, signaling 1Y, that

PC attenuation is not normal (underestimated or overestimated), at the first output of indicator 19 a signal O is saved, prohibiting the signal 1 from BTORoro of threshold unit 12 through the first element 11 to the control input of switch 15, and at the second output of indicator 19 a signal is generated Damage that can be transmitted to a PC input using a separate data collection device. The absence of a measuring signal at the output of an OK for some specified time is enough to conclude on the transmitting side that the attenuation of the test channel does not correspond to the tolerance.

Let us suppose that the attenuation has increased to such an extent that the third threshold block 16 does not work, but only the first threshold block 9 is triggered, from which, through the first delay element 20, a signal arrives at the second input of the operation mode block 17 and the second element AND 29 and the first element OR 30 to the input of the trigger 33, which is set to the signaling position O, to the first output of the operation mode setting unit 17, as a result of which the switching element 18 is not turned on. Thus, the received measurement signal from the PC output directly through the second input of the switching element 18 to the input of the second threshold unit 12 is provided. Simultaneously, the input of the control unit 10 receives a signal prohibiting the regulation of the adjustable quadrupole 8. Therefore, the loop will not be installed, since the level of the measuring signal received at the input of the first threshold unit 9 remains still underestimated (adjustable quadripoles 3 and 8 in the control prohibit position). The measuring signal does not arrive at the OK output, as a result of which some time later it will be decided that the attenuation is not normal (the channel is not valid). Based on the signal O, coming from the third threshold unit 16, the indicator 19 generates a signal from Avariya, which is fed to the output bus 24 of the U9T device for transmission to an external information collection device.

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In the absolute control mode, the attenuation of the PC and OK switching element 7 is set by pressing the corresponding button to transfer the measuring signal from the output of the quadripole 3 to the PC input, and at the command of the program unit 1, the frequency of the measuring generator 2 is set and - setting the adjustable quadrupole 3 to the maximum damping position. A minimum level measuring signal arrives at the PC input, which with a delay arrives at the PC output with a level from which only the first threshold unit 9, from which the short trigger signal 1 through the first delay element 20 arrives, can be triggered to the second input of the operating mode setting block 17 and d; angrier, through the second element AND 29 and the first element OR 30 to the input of the trigger 33, which is set to the position of giving the signal O to the first output of the operating mode setting unit 17, resulting in The switching element 18 is not turned on and the received measurement signal from the PC output directly through the second input of the switching element 18 to the input of the second noporoBOi o block 12 is provided. Simultaneously from the first output of the block 17 ycTatiOBKH operating mode through the second element I 14 to the first input of the block 10 control signal is received prohibiting the regulation of the regulated quadrupole 8. At the same time, the damping of the adjustable quadrupole 3 gradually decreases, which leads to a corresponding increase in transmission coefficient quadripole adjusted is 3, and the measurement signal level at the input of the PC increases accordingly. Initially, the level of the measuring signal at the PC output reaches the threshold value of the first threshold unit 9, from the second output of which signal 1 enters indicator 19 and from the first output a short signal through the first delay element 20 to the second input of operating mode setting 17. A short signal is received through the second element And 29 and the first element

WL 30 to the input of the trigger 33 and sets it to the initial state, at which the first output of the mode setting unit 17 produces the signal O, Continuing to rise, the level of the measuring signal reaches the response value of the third threshold unit 16, from which signal 1 the second input of the indicator 19 and through the second element 22 of the delay to the second input of the first element I 11. With a further increase in the level, the second threshold unit 12 is triggered, from which then signal 1 is sent to the first input of the indicator 19. In turn, is formed on the first output signal 1 of the indicator 19, as the decoder 21 in this mode of operation does not generate four signals leaving the controlled popyusnika 8 beyond tolerance. At the same time, the signal 1 from the output of the second threshold unit 12 is fed to the first input of the first element 11. Previously, the signal 1 came from the output of the second delay element 22 to the second input of the first element 11, the output of which produces the signal 1. On entering the input of the switch 15, this signal includes loop and provides a measuring signal to the input DK, the output of which from the leading edge of the measuring signal triggers the threshold unit 4, which by means of the control unit 5 stops the process of adjusting the adjustable pair rehpolyusnika 3 and permits measurement of the level change ritel1} Nogo signal by the measuring unit 6 at the input of the PC and the OK to evaluate their attenuation.

Claims (1)

 1. A device for controlling the attenuation of communication channels, containing on the transmitting side a serially connected program block, a measuring generator and an adjustable quadrupole connected in series — a threshold block and a control unit, the second input of which is connected to the output of the program block, the output of the control unit is connected to the second input of an adjustable four-port network, the measuring unit, the first input of which is the input of the forward channel connection, and the second input is connected by fc input of the threshold unit and is the output of the reverse communication channel, the control input of the measuring unit is connected to the output of the threshold unit, and on the receiving side is the first threshold unit and an adjustable quadrupole, the inputs of which are interconnected the output of the forward link, the control unit, the output of which is connected to the control input of the adjustable quadrupole, the second threshold unit, the five 0 about five the second and second elements AND, the element NOT and the switch, the input of the second threshold unit is connected to the input of the switch, the output of the second threshold unit is connected to the input of the element NOT, the output of the element is NOT connected to the first input of the second element AND whose output is connected to the second input of the control unit, The switch output is a reverse link input, characterized in that, in order to shorten the monitoring time, a switching element is introduced on the transmitting side, the first input of which is connected to the output of a two-port network, volts The input is connected to the output of the measuring generator, and the output is connected to the first input of the measuring unit, on the receiving side - the switching element, the first input of which is connected to the first output of the adjustable quadrupole, the second input is connected to the input of the first threshold unit, and the output unit, the first delay element, the input of which is connected to the first output of the first threshold unit, the third threshold unit, the input of which is connected to the input of the first threshold unit, the decoder, the indicator, the second element m delay, the output of the second threshold unit is connected to the first inputs of the first element And the indicator, the second input of which is connected to the output of the third threshold unit and the input of the second delay element whose output is connected to the second input of the first element H, the third input of which is connected to the first output of the indicator , the third input of which is connected to the second output of the first threshold unit, a quarter of the indicator's code is connected to the output of the decoder, the first input of which is connected five 0 five not with the second output of the regulated quadripole, the control input of the switching element is connected to the second inputs of the second element And the encoder’s money, the control input of the switch is connected to the output of the first element And, the second indicator output is connected to the output bus, the mode setting unit, first, second , the third and fourth inputs of which are connected respectively with the output of the third threshold block, the output of the first delay element, the second output of the first threshold block and the input bus, and the first, second and third output s are connected respectively to the second input of the second element AND, the first input of the control unit and the third input of the control unit, 2, The device according to claim 1, about tl and - the fact that, the mode setting unit comprises the first, second and third elements AND, the first and second elements He, the first and second elements OR, the delay element, the first and second drivers pulses, trigger, the output of the first element is NOT connected to the input of the first driver of the pulses and through the delay element to the first input Compiled by S.E. n Editor N.Gorvat Tehred A.Kravchuk Proofreader G, Reshetnik Order 5578/57 Circulation 636 Subscription VNII1Sh State Committee of the USSR on affairs of invention and discoveries 113035, Moscow, Zh-35, Raushsk nab., d, 4/5 Production and printing company, Uzhgorod, st. Project, 4 The third AND element, the output of which is connected to the first input of the second OR element, the second input of which is the fourth input of the mode setting block, and the output connected to the first input of the trigger, the output of which is the first output of the mode setting block, and the second input connected to the output of the first OR element, the first input of which is connected to the output of the second element AND, and is the third output of the mode setting unit, the second input of which is the first input of the second element AND, the second input of which is connected With the output of the second element NOT, the input of which is the first input of the installation unit of the operation mode and connected to the input of the second ф (pulse dirser and the first input of the first element And whose output is the second output of the mode setting unit, and the second input connected With the trigger code, the outputs of the first and second pulse formers are connected respectively to the second inputs of the first S1I element and the third And element, the input of the first element is NOT the third input of the operating mode setting unit.