SU127291A1 - Device for transmitting and receiving pulses over a telephone low frequency path - Google Patents

Description

In the process of establishing a connection between two wired BELT telephone sets, the main conversational path can be briefly used to transmit digital information and control signals. In this case, the transmission should be carried out not only via the usual connecting line, but also via the telephone channels of the compaction equipment with a sufficiently high rate of transmission of pulse signals in both directions.

Known technical solutions for ensuring the use of telephone paths on both sides and making the transition from so-called two-wire lines to four-wire lines and back using differential systems with balanced lines require very cumbersome and expensive devices that are difficult to configure and operate.

The described device is devoid of these disadvantages and provides E. fulfillment of these requirements. The device uses magnetic switching elements with a rectangular hysteresis loop. The impulse electrical signals transmitted along the line are transformed output binary electrical values of the magnetic cells. These signals are switched in such a way that these requirements are met.

The drawing shows a block diagram of the described device, designed for channels with high attenuation.

A device that transmits signals to a line has, as an output element, a magnetic switching cell M, which is a single-cycle cell on ferrites with a rectangular hysteresis loop. Due to the use of an increased cross-section of the cores and wsi: arousal of excitation by the clock pulses of the output cell M

№ 127291

its power is about three times higher than the other magnetic switching cells of a similar circuit. This cell, due to the presence of a corresponding delay circuit in it, converts short pulses (on the order of 10 microseconds), arriving at its input from ordinary magnetic switching cells, into single-pole pulses of about 1000 microseconds with a frequency of about 1000 Hz, which can be transmitted over telephone channels without significant distortion.

From the storage or any other switching device, through the intermediate cell I, information is successively fed to the EXIT cell M and to an additional forbidden circuit including the magnetic cell fJi and the forbidden logic cell 3, also implemented on the magnetic elements. At the receiver input, an amplifier Y is turned on to compensate for the attenuation introduced by the channel and to generate pulses received from the line. A line (or communication channel) is connected to transceiver switching devices via linear transformers LT, one winding of which is connected to a telephone channel, and the other two are connected through a magnetic relay input and outgoing switching circuits to a transmission line and a receiving line (labeled on the input and output diagram). The prohibition 3 logic cell is connected between the incoming and outgoing switching circuits, preventing the return of its own information from the output to the input of the same station.

In the drawing, the beginning of the windings of the linear transformers LT are indicated by the letter I, and the ends - / С. In the absence of amplifiers at the reception, the input and output windings of the linear transformer include oncoming and incoming E, the transmitter pulse pulses cannot activate the receiving circuit of the same station.

Subject invention

A device for transmitting and receiving pulses over a telephone low-frequency path, including magnetic elements with a rectangular hysteresis loop, characterized in that, in order to ensure the separation of sig1olB, alternately alternating in opposite directions, it uses: a transformer, one winding of which is connected to the telephone channel, and the other two through magnetic relay incoming and outgoing switching circuits are connected respectively to the transmission line and the receiving line, and the prohibition logic circuit on magnetic elements The tags are included between the incoming and outgoing switching circuits, preventing the return of their own information.