SU1305878A1 - Device for testing regenerators of digital communication systems - Google Patents

Abstract

The invention relates to telecommunications. The purpose of the invention is to increase the accuracy of the test. The device contains encoder 2, artificial line 4, gr. 5, decoder 7. error detector 8, control unit 9, synchronization unit 10, counter P, display unit 13, regenerator under test 1. Again: switch 3, delay 6 K1V, analyzer 12 are introduced. Block 9 is a parallel connection of three counters (C pulses, at the outlets of which triggers are turned on, are timers. 1 and C generates a pulse with a duration equal to the test sequence, the 2nd C generates a pulse, the duration of which is equal to the time of the measurement session, the 3rd C generates a sequence of pulses determining the number of synchronous and asynchronous regenerators in the modulated path. 1 ill. (L oo oh el oo 00

Description

The invention relates to telecommunications and can be used in testing equipment of the linear path of digital transmission systems, certification of regenerators and their output control.

The purpose of the invention is to improve the accuracy of testing.

The drawing shows the electrical circuit diagram of a device for testing regenerators of digital communication systems.

The device contains the test regenerator 1, encoder 2, switch 3.15 artificial line 4, generator 5, delay element 6, decoder 7, error detector 8, control unit 9, synchronization unit 10, counter 11, analyzer 12 and display unit 13. 20

The device works as follows.

The binary test signal from the output of generator 5 through encoder 2 is fed to the input of switch 3, from which 25 a linear signal is fed to the input of artificial line 4. There it is distorted due to thermal noise and intersymbol distortion and is fed to the input of the tested regenerator. From the output of the test regenerator 1, the reconstructed linear signal through the delay element 6 is fed to the input of the decoder. 7

as well as the error detector 8, their respective inputs are supplied with a clock voltage from the output of encoder 7. Delay element 6 is pre-assigned to delay the signal for a time equal to the difference between the duration of the test signal cycle and the propagation time of the signal in the cat 3, artificial line 4 and the regenerator under test I. The error detection detects an error decoded signal, the number of which is counted by the counter 11. I

The operation of the counter I1 is possible at the time of passage, the value of the cycle of the spill signal, for which its permitting input is given the output signal of the control unit 9 equal to the test signal period, and formed from the pulse from the output of the synchronization unit 10. The same pulse records the number of detected errors in analyzer 12 after analyzing each cycle of the test signal, and counter II is reset after each such cycle.

Thus, after testing, the analyzer 12 stores information that characterizes the number of errors in each of the i measurements, where i is the total number of cycles measured

After conducted} tests in s

analyzer I2 can calculate the error rate in the i-M regenerator I which is equal to the difference in the number of errors on the i-M measurement cycle and the i-1-n number divided by the number of characters in the J-M cycle of the test sequence, according to the expression

from i

N.

the output of which is recovered, - -.

j, depending on the required information, the binary test signal is fed to the input of the error detector 8 and to the input of the synchronization unit 10, in which the pulse that characterizes the start of the test sequence cycle 40 is detected. This pulse arrives at the input of control block 9, which produces a control signal for switch 3, which trips the output of encoder 2 from the input of artificial line 4 and connects the output of delay element 6 to the input of artificial line 4 for the test time, which is proportional to the number of regenerator-50 the error rate is equal to P tori in the modulated path. In addition, the control unit 9 generates a regenerator control signal that determines the structure of the regenerator and the number of asynchronous, 5 generators connected between two

SYNHRONNEMI.

In addition, analyzer 12 calculates the total error rate for the entire modulated path, while

NE

 OU1

N

where Ng is the total amount of error

N

- total number of monitored positions of the test signal. The calculated error rates are output to the display unit 13.

For the synchronous operation of the control unit 9 and the synchronization unit 10.

50

5 o

as well as an error detector 8 for their respective inputs, the clock voltage is supplied from the output of decoder 7. Delay element 6 is designed to delay the signal by a time equal to the difference between the duration of the test signal's cycle and the propagation time of the signal in switch 3, artificial line 4 and the test regenerator I. The 8 error detector detects errors in the decoded signal, the number of which is counted by the counter 11. I

The operation of the counter I1 is possible only during the passage, the test signal cycle times, for which a signal from the output of the control unit 9 equal to the period of the test signal and generated from the output of the synchronization unit 10 is fed to its enable input. The same pulse records the number of detected errors in the analyzer 12 after analyzing each cycle of the test signal, and also clears counter II after each such cycle.

Thus, after testing, the analyzer 12 stores information that characterizes the number of errors in each of the i measurements, where i is the total number of measurement cycles

After conducted} tests in -.

analyzer I2 can calculate the error part in the i-M regenerator I, which is equal to the difference in the number of errors in the i-M measurement cycle and the i-1-n number divided by the number of characters in the J-M cycle of the test sequence, according to

depending on the required information, the error coefficient is equal to P

from i

N.

ty from required ient error ra

isosti from the required information the error rate is equal to P

In addition, analyzer 12 calculates the total error rate for the entire modulated path, while

tre oshi

NE

ti from t ient osh

 OU1

N

depending on the required information, the error coefficient is equal to P

where Ng is the total number of errors;

isosti from the required information the error rate is equal to P

N

- the total number of monitored test signal positions. The calculated error rates are output to display unit 13.

The control unit is a parallel connection of three pulse counters, the outputs of which include triggers, which form time slots. The first counter generates a pulse with a duration that is equal to the test sequence; the second counter generates a pulse, the duration of which is equal to the time of the session of measurements; the third counter generates a sequence of pulses determining the number of synchronous and asynchronous regenerators in the modulated path, and when the impulse arrives at the input of the third counter, the block of the clock frequency selector in the regenerator 5 is disconnected, i.e. it is put into asynchronous regeneration mode.

Claims (1)

Invention Formula A device for testing regenerators of digital communication systems, comprising a display unit, a generator, an encoder, an artificial line, an error detector, a control unit, a counter, and a serially connected decoder Compiled by V.Kamal gin Editor A.Shandor Tehred V.Kadar Proofreader L.Patay Order 1466/56 Circulation 639Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 The synchronization unit, the generator output is connected to the encoder input, and the first control unit output is connected to the first meter input, characterized in that, in order to improve the test accuracy, an analyzer, a delay element and a switch are introduced, the first input of which is connected to the output encoder, the second input is connected to the output of the delay element and the input of the decoder, the third input is connected to the second output of the control unit, and the output is connected via a serially connected artificial line, the regenerator under test is connected to the input element and the delay, the third output of the control unit is connected to the control input of the test regenerator, the first input is connected to the output of the synchronization unit, the second input of the counter and through the analyzer is connected to the display unit, the second input is connected to the other output of the decoder, another input of the synchronization unit and the first input of the error detector, the second input of which is connected to the output of the decoder and the output connected to the third input of the counter, the output of which is connected to another input of the analyzer.