SU430516A1 - DEVICE CONTROL BREAK OF COMMUNICATIONS - Google Patents

Description

one

This invention relates to the transmission of discrete information over switched connection lines.

Interruption monitoring devices are known that analyze the level of the transmitted frequency or the carrier envelope, which contain integrators, counters, sampling schemes of time and output circuits.

However, when transmitting random discrete signals with a passive pause (for example, pseudo-termination signals), these devices have low speed and low reliability in operation.

The described device differs from the known ones in that a discrete interrupt selector is switched on between the time sampling circuit and the output circuit, which detects the absence of received signals and controls the output circuit and the counter. The output of the discrete selector is connected to the reset input of the counter and the installation input of the output trigger circuit, which makes it possible to detect interruptions of a given duration immediately after their occurrence and, consequently, to increase the control performance.

Improving the reliability of determining the interruption under the influence of interference is accomplished by connecting the reset input of the discrete selector to the nth counter divider, since the occurrence of errors does not lead to

switching of the counter and the output trigger scheme.

The drawing shows the block diagram of the described device.

The device contains a receiver 1 pseudo-tertiary signals. The receiver includes an input amplifier 2, a detector 3, a circuit 4 discrete automatic phase adjustment (DAPF) clock frequency, a reference frequency generator

5, a regenerator 6. The device also contains a time sampling circuit 7, a discrete selector 8, made in the form of a sequential counter with reset, a pulse counter 9, which determines the number

periods of the reference frequency for a given duration of the break, the output trigger circuit 10, fixing the presence and absence of a break. To the input of the receiver 1 are received successively pseudotrochny signals. After passing through the input amplifier 2, the detector 3 and the regenerator 6, the pulse signals in the form of trigger packets arrive at the input of the sampling circuit by time and output

receiver. At the other input of the circuit 7 receives the clock frequency from the circuit 4 DAPP. Binary parcels from the output of the circuit 7 are fed to the counting input of the discrete selector 8. If there is a signal at the output of the selector 8 on

input reset counter 9 and output circuit 10

The installation signal is sent to "O. When a break occurs at the input of the discrete selector 8, binary parcels are not received, and the installation signals "O to counter 9 and circuit 10 are not sent. After filling the pulse counter from the t-th output to the trigger circuit 10, the setting signal "1" is given, which indicates the appearance of a communication interruption. When the inputs of the selector 8 pulses are received, acting during a communication break, the signals from the n-th splitter of the counter 9 periodically set the discrete selector to position “O”, which eliminates the possibility of incorrectly determining the duration of the break.

Subject invention

Claims (2)

1. A communication break monitoring device containing series-connected the pseudo-tertiary receiver, the counter and the output trigger circuit, as well as the time sampling circuit associated with the pseudo-terrestrial receiver, differ from the fact that, in order to increase the speed and reliability of the device in operation, the circuit includes a discrete selector, the reset input of which is connected to the nth counter divider, the output of the discrete selector is connected to the reset input of the counter and the installation input of the output trigger circuit. 2. A device according to claim I, characterized in that the discrete selector is made in the form of a sequential action counter with a reset.