SU1125753A1 - Device for quality control of operation of receiver of digital signals transmitted via fibre-optics communication line - Google Patents

Abstract

Qbntr01sh device of operation quality of the first element I and to the input of the detectors Tojpa of the synchronization pulses, which is of a kind, and in order to simplify the device by eliminating its own generator of code combinations in the bi-pulse mode of transmission, NOT element, two integrators, fourth AND element and sequentially connected adder to module two and pulse expander, the output of which is connected to the input of the error indicator, output of the first element AND through the first 1 integrator connected to the first input of the third element AND, the output of the element NOT supported: Lrchen to the first input of the second element I, the output of which through the second integrator is connected to the first input of the fourth element I, the output of which and the third element of the third element are connected to the corresponding inputs of the modulo two, sync pulse detector outputs. This connection is connected to the second inputs of the elements. And the input of the element is NOT connected to the output of the photoelectric converter.

Description

 t1 The invention relates to fiber-optic communication, and more specifically; But - to the error control devices of the receiver operation of the cascades of devices used in fiber-optic communication lines. ; A known device for controlling the quality of a digital signal receiver, containing a code combination generator, a delay line, a transmitter, a summation unit, internal devices, a ksadparator receiver, a pulse counter, and a separating device connected in an appropriate way M. The operation of this device is based on a comparison delayed transmission time delays of the same code combinations, which on the receiver side match in time and are compared. However, the known device cannot be used in the transmission of discrete information using a bi-pulse signal, which is most widely used on optical lines. . . The closest to the invention in terms of technical and achievable result is a device for monitoring the quality of the receiver of digital signals of a fiber-optic communication line, which contains a photoelectric converter, a generator of code combinations, the first and second elements I, to the inputs of which a photoelectric converter is connected and code combinations, synchronization pulse detector, connected to the output of the first element AND, the first element OR, whose inputs are connected to the outputs of the first second and second elements, the second element OR, whose inputs are connected to the output of the synchronization pulse detector and the third element AND, to one input of which the output of the generator of code combinations is connected, a register to whose inputs the outputs of the first and second OR elements are connected, an error indicator connected to the register via a photoelectric converter, except for TgO, the output of the pod / pochey indicator to the inputs of the second and third And elements, and to the input of the first And element - through the logic element JWeHT 2 3 The device is based on a comparison of received codeword | sombinatsiey generated codeword generator. This significantly complicates the device design and requires hard code matching of the transmitters. devices and devices. control that is not in all cases expedient or feasible by simple means. The purpose of the invention is to simplify the device by eliminating its own generator of code combinations in bi-pulse transmission mode. The goal is achieved by the fact that, in a quality control device, a receiver of digital-signals of a fiber-optic communication line containing a photoelectric converter, the first, second and third elements AND, a detector of synchronization pulses and an error indicator, the output of the photoelectric converter being connected to the first input of the first element And to the input of the detector of synchronization pulses, the element NOT., Two integrators, the fourth is introduced. An element And serially connected modulo two and a pulse expander, the output of which is connected to the input of an error jumper, the output of the first element And through the first integrator is connected to the first input of the third element And, the output of the element is NOT connected to the first input of the second element And, the output of which the second integrator is connected to the first input of the fourth element And, the output of which and the output of the third element and connected to the corresponding inputs of the modulo two adder, the outputs of the detector of synchronization pulses, yucheny to second inputs of AND and NOT input element is connected. with photoelectric converter output. FIG. 1 shows a block diagram of a device for controlling the quality of operation of a receiver for digital signals of fiber-optic communication LINES; in fig. 2 - temporary screening devices for operation. The device for monitoring the quality of operation of a digital signal receiver in a fiber-optic communication line co311 holds a photoelectric converter 1, the first element is AND 2, the second element is FROM, the third element is AND 4, the fourth element is AND 5, the first is integrator 6, the second is integrator 7, the element is NOT 8 , the detector 9 synchronization pulses, the adder 10 modulo two, the expander 11 pulses and the indicator 12 errors. The device works as follows. The operation of the device is based on processing the signals separately by the symbols 1 and O carried out in two channels, the signal processing channel 1 and the processing channel by the signal symbol by the symbol O. The incoming signal (Fig. 2a) is a bi-pulse message. The parcel enters the signal processing channel by symbol 1 to element I2 (FIG. 2a), in which the corresponding logical operation is performed with the reference signal from the output of the detector 9 of clock synchronization C1 (FIG. 2c). The input signal can be written EVIL; -l6 ( V2-To) for characters 1 s, (t) J -ic (); (2) l6 (Tg / 2- To) for the symbols o, Detector 9 synchronization pulses1 SCHEDULES generates a reference signal in the sense of Gle (Oi-To / 2) -16 (t / 2-5-Td) In this case, the algorithm is accepted the decision on the presence of symbol 1 and symbol O is written in the form Yr (t) jCs (t) Y, (t) - | s (t) uUe (t) dt, O The signal from the output of element I2 (fig. 2d) is integrated by integrator 7 (fig, 2e), and then gated with pulses (fig, 2) from the output of detector 9 and from the output of element I4 (fig , 2k) is fed to the input of the adder 10. Similar signal processing takes place in the signal processing channel by the symbol O (FIG. 2b, d, g, and). As follows from the algorithm (A), the simultaneous presence in the 0-T interval in the channel US4vol 1 and O is a sign of an error signal, which is recorded from the truth table AO 1 1 O B 1 O 1 O C O O 1 1 AB + AB The algorithm (5) is executed with a total of 10 seconds in Version (OR-NOT, FIG, 2L), Pulses from the output of the adder 10 through the expander 11 pulses arrive at the error indicator 12 (FIG. 2l - dotted lines indicate the error signals). Thus, this device allows to measure the noise immunity of fiber Optical communication lines without interrupting their operation, in connection with which the uninterrupted communication time can be increased. From the point of view of cost indicators, this device is 250-ZOr p. cheaper than devices whose operation is associated with the use of a code combination generator.

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Claims (1)

DEVELOPMENT QUALITY CONTROL DEVICE FOR THE DIGITAL SIGNALS OF THE FIBER-OPTICAL COMMUNICATION LINE, containing the photoelectric converter, the first, second and third AND elements, the synchronization pulse detector and the error indicator, wherein the output of the photoelectric converter is connected to the first input of the first element And to the input of the synchronization pulse detector ¹ , which is /// l, and moreover, in order to simplify the device by eliminating its own generator of code combinations n & and bi-pulse transmission mode, enter given an element NOT, two integrators, a fourth element AND, and a series-connected adder modulo two and a pulse expander whose output is connected to the input of the error indicator, the output of the first element And through the first integrator is connected to the first input of the third element AND, the output of the element is NOT connected to the first the input of the second element And, the output of which through the second integrator is connected to the first input of the fourth element And, the output of which and the output of the third element And are connected to the corresponding inputs of the adder modulo two, outputs pulse detector synchronization. The connections are connected to the second inputs of the AND elements, and the input of the element is NOT connected to the output of the photoelectric converter. V δδΖδζίΐ. 10