SU493929A1 - Device for measuring parameters in data transmission channels - Google Patents

Description

one

The invention relates to a measurement technique and can be used in telecommunication technology.

A device for measuring parameters in data transmission channels is known, comprising a test signal amplifier connected to the analyzer directly and through a series-connected phase unit and a reference sensor, an input amplifier, a test sensor with an output amplifier, a time interval imager, and counters.

However, the known device does not measure all the necessary parameters from the point of view of improving the quality of the transmitted information, which reduces the accuracy of monitoring the operation of data transmission channels.

The purpose of the invention is to improve the accuracy of monitoring the operation of data transmission channels.

To do this, a switching unit, a trigger, a decoder, a coincidence unit, a pulse generator, a time interval comparison unit and a data decoder are introduced into the proposed device, and an input amplifier, an analyzer and a coincidence unit are connected to the inputs of the switching unit, one input of which is connected via a trigger to the phasing unit and the decoder with the test sensor, and the second to the pulse generator connected via a time generator to the comparison unit, the outputs

which directly, and the input through a serially connected data decoder and the first counter are connected to the switching unit, the other two outputs of which are connected to the corresponding counters.

The drawing shows a block diagram of the proposed device. Device for measuring parameters in

data channels contain test signal amplifier 1, connected to analyzer 2 directly and through series-connected phasing unit 3 and reference sensor 4; sensor test 5, the outputs of which are connected to the inputs of the output amplifier 6 and the decoder 7; the trigger 8, the inputs connected to the outputs of the decoder 7 and the phasing unit 3, and the output to one of the inputs of the matching unit 9; input amplifier 10; the switching unit I, to the corresponding inputs of which the outputs of the input amplifier 10, the analyzer 2, the matching unit 9 and the comparison unit 12 are connected, and the outputs of the counters 13, 14 and 15 to the outputs,

moreover, the output of the counter 13 is connected via a data decoder 16 to one of the inputs of the comparison unit 12, to the other input of which the output of the time interval generator 17 is connected; pulse generator 18,

connected by outputs to another input

coincidence unit 9 and input of time mapper 17.

The device works as follows.

From the test sensor 5 through the output amplifier 6 to the data transmission equipment (APD) is issued a test that, having passed a discrete channel (DC) or data transmission channel (AP), from the ADF goes to the test signal amplifier 1. From the output of amplifier 1, the input test signals are fed to the input of the phasing unit 3 and the analyzer 2. In the phasing unit 3, a signal is generated, according to which the cyclic phasing of the test of the reference sensor 4 with the received test occurs. From this moment on, analyzer 2 performs an elemental comparison of the received test with the test of the reference sensor 4, as a result of which, erroneous elements are detected in the received test. The counter 14 at the position of the switch of the switching unit 11, corresponding to the measurement mode of the DK safety elements, counts the number of erroneous single elements during the measurement time.

The ratio of the defective unit elements is determined by the formula

Aosh1 Znep

where Pos1 is the number of unit elements calculated for the measurement session;

rtnep f-r is the number of unit elements issued to the consumer during the measurement session;

V - data transfer rate, bit / s;

T - measurement session, sec.

In addition to the test, in the measurement mode of undetected erroneous blocks (characters) from the ADF, the input amplifier 10 receives signals accompanying the blocks (characters) of the received data. These signals, at the position of the switch of the switching unit 11, corresponding to the counting mode of undetected erroneous blocks (characters) of the PD channel, arrive at the counter 13, where the number of transmitted data blocks (characters) and the counter 15 are counted in this mode, the number of undetected erroneous data blocks (characters) is counted .

The ratio of undetected error blocks (characters) is determined by the formula

1U-OSHA

And osh. - -)

where Posh is the number of undetected erroneous blocks (characters) counted by counter 15 per measurement session;

YV is the number of blocks (characters) of data transmitted during the measurement session.

The data decoder 16, together with the counter 13, at the moment when the transmission of a predetermined amount of data is completed generates a signal. This signal is fed to one input of Comparison Unit 12, to another input of which signals are sent from the time slot generator 17. In Comparison Unit 12, the determination of the timeliness of arrival of a given amount of data in a given time interval is performed. From the output of the comparator unit 12 to the counter 14, at the position of the switch of the switching unit 11, corresponding to the mode of determining the timeliness of information from the AT channel, signals characterizing the amount of transmitted data in a predetermined time interval are given, and signals indicating the amount of delayed data are sent to the counter 15 in a given time interval.

The timely arrival of information from the PD channel is characterized by the following condition:

,,

where L is the number of blocks (characters) transmitted by the PD channel for a given (allowable) time;

 - the specified number of data blocks (characters) that must be transmitted in the allowed time.

At the moment of issuing the combination 111000111 by the decoder 7, a signal is generated that sets the trigger 8 to the state "1, allowing the coincidence block 9. The signals from the pulse generator 18 go through the coincidence block 9 to the counter 13 corresponding to the measurement mode of the signal propagation time in DC. The process of counting the signals of the pulse generator 18 by the counter 13 ends when the phasing unit 3 selects from the input test the combination 111000111 previously transmitted to the ADF. The signal from the output of the phasing unit 3 sets the trigger 8 to the state "Prohibiting the operation of the matching unit 9.

Subject invention

A device for measuring parameters in data transmission channels, comprising a test signal amplifier connected to the analyzer directly and through a serially connected phasing unit and a reference sensor, an input amplifier, a test sensor with an output amplifier, a time interval generator and counters, characterized in that increase the accuracy of control of data transmission channels; a switching unit, a trigger, a decoder, a coincidence unit, a pulse generator, a time interval comparison unit and a depif data rater, while the input amplifier, analyzer and coincidence unit are connected to the inputs of the switching unit, one input of which is connected via a trigger to the phasing unit and the decoder with the test sensor, and the second to the pulse generator connected through the time generator with the -56 unit

comparison, the outputs of which are directly connected to the switching unit, the other two outputs through the series connected turns of which are connected to the corresponding data decoder and the first counter with counters.

493929

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