SU1676112A1 - Commutator for priority communication - Google Patents

Abstract

The invention relates to communication technology. The purpose of the invention is to increase reliability by reducing the number of contacts performing the switching. The predominant switchboard contains a relay 1, buttons 2, first, second contacts 3, 3 relays, auxiliary contacts 4 relays,

Description

The invention relates to communication technology and can be used in devices for connecting main subscribers to fixed lines of communication.

The purpose of the invention is to increase reliability by reducing the number of contacts performing the switching.

The drawing shows the electrical circuit diagram of the switch of preferential communication.

The primary switchboard contains m relays, m buttons 2i-2m, m first contacts -3m, m second, relay contacts, m-1 additional relay contacts, m-1 transistors 5i-5m-i, m-1 first 6i diodes 6m-i, m-1 second diodes 7i-7m-i, m-1 third diodes 8i-8pi, m-1 resistors 9i-9m-i.

The primary switch operates as follows.

In the initial position, all relays 1 are de-energized. To the bases of all transistors 5, the positive pole of the power supply is fed through the resistors 9, and they are in the open state, therefore on the second terminals of the relay coils 1 there is a minus power supply supplied through these transistors. When any button 2 is pressed, the corresponding relay 1 is triggered. For the 1T relay, the tripping circuit passes through all open transistors 5 to the power supply minus, and for the remaining relays, through its own first diode 6 and the series connection of open transistors 5, the number of which decreases to one in depending on the number of the relay, minus the power source. Relay 1m-i works through its own first diode 6 and its own transistor 5.

If at a certain moment several buttons 2 are pressed simultaneously or the subscriber presses button 2, which takes precedence over the already established subscriber with a lower priority, then relay 1 is activated only

subscriber with the highest priority in this particular situation. The remaining relays 1 do not work or are released if they were working at the moment when the button 2 was pressed by the subscriber with a higher priority.

When a connection is established by the m-subscriber, a 1t relay is triggered across the circuit: plus, button 2t, the series connection of all open transistors 5, minus. Relay 1t is activated and its

The first and second pins of 3T and 3T connect the line to the mth subscriber

If at this moment (t-1) th subscriber wants to occupy the line, he presses his own button 2t-1 and the relay 1t-1 is triggered by

Chains: button 2m-i, winding relay 1t-1. the first diode 6m-i, own open transistor 5t-1, minus. Relay 1t-1 is activated and closes its additional contacts 4t-1. The minus of the power source through the contacts 4m-i and the third diode 8m-1 are fed to the base of the transistor 5m-1 and the latter is closed, and all relays 1 with lower priority are released, and in this case the relay 1m of the t-th subscriber releases. Relay 1m-i (m-1) -ro

the subscriber is held through the second diode 7t-1 and with its first and second contacts 3m-1 and 3m-1 connects the line to the (t-1) subscriber. Hang up occurs when the button 2t-1 is opened. A subscriber with a lower priority can, by pressing button 2, wait for the release of the line to become a subscriber with a higher priority.

Claims (1)

Claims of the Invention Primary Switch containing m relays, the first output of each of which is connected to the source of a constant voltage through the corresponding button, m-1 of the first diodes, and the first conclusions of the first and second contacts of all m the relay is connected to the corresponding subscriber line, and the second pins of the first and second pins of the m-ro relay are connected to a communication line, characterized in that, in order to increase reliability by reducing the number of contacts commuting commutation, DC voltage t-1ncs, emitter of the 1st second and third diodes, t-1 resistors, transistor, where I - 1, m - 2, are connected to t-1 transistors, and also t -1 additional collector of the (1 + 1) -th transistor, and emitter contacts of the relay, the first output of each (m-1) -ro transistor is connected to the negative of which is connected to the cathodes by the corresponding 5 of the source of the constant second and third diodes, the anode of each voltage, and the emitters of all transients from the second diodes are connected to the second stoppers connected to the second Owls with the water of the corresponding relay and anodomically appropriate auxiliary contacts of the corresponding first diode, the cathode of the co-relay, and the second output of the m-ro relay is connected to the top of the collector of the corresponding-10 collector of the first transistor, the second of the main transistor, connected to the anode of the corresponding of the (t-1) -th relay connected to the corresponding third diode and through the corresponding to the first output of the first and second resistors with the positive pole of the source of the m-ro relay. 15