SU1561210A1 - Device for combined switching o telephone sets - Google Patents

Abstract

The invention relates to telephony. The purpose of the invention is to ensure the independent operation of one of the telephones with one number. The device for the combined switching of telephone sets 16 and 17 contains relays 1 and 2 with contacts 9-12, diode 5, capacitors 8 and 20, subscriber line 15. The goal is achieved by introducing relays 3 and 4 with contacts 13 and 14, resistors 6 and 7, the transistor 18 and the power supply 19, by which when the tube is removed from the apparatus 17, it is turned on in line 15. If the tube 17 is picked up on the apparatus 16 while conducting a conversation from the apparatus 17, then the apparatus 17 is disconnected from the line 15 and into it The apparatus 16 is turned on. If during the conversation with the apparatus 16 is raised on apparatus 17, the state of the circuit does not change and disconnection of apparatus 16 from line 15 does not occur. Thus, a higher priority is given to apparatus 16. 1 Il.

Description

The invention relates to the field of telephony and can be used to connect two telephone sets having a different priority into one subscriber line.

The aim of the invention is to ensure the independent operation of one of the telephones with one number.

The drawing shows the structural electrical circuit of the device for the combined switching on of telephone sets.

The device contains the first - fourth relay 1-4, diode 5, the first and 1 second resistors 6 and 7P capacitor 8, the first - the third contacts 9-11 of the first relay 1, contact 12 of the second relay 2, contact 13 of the third relay 3, contact 14 fourth relay 4, subscriber line 15, first and second telephones 16 and 17, transistor 18, power supply 19, second capacitor 20.

I A device for the combined switching on of telephone sets works as follows.

i In the initial state, when the handsets of both telephone sets 16 and 17 are laid, the bell circuit of the first telephone set 16 through the normally closed contact 9 of the contacts of the first relay 1 is connected to subscriber line 15, and the bell circuit of the second telephone set 17 is disconnected from the subscriber Denmark 15 normally open contacts 10 and 11 of the first relay. This voltage from the automatic telephone station (PBX) to the subscriber. Line 15 receives a high voltage of 60 V. When a call signal is sent from the PBX to the subscriber line 15 in the form of AC voltage of 25 Hz and amplitude 30 V, it will be accepted only first telephone set 16.

When the tube is removed from the second telephone set 17, currents generated by the voltage in the subscriber line 15 w by the voltage of the power supply source 19 flow through the first resistor 6. These currents respectively flow through the following circuits: the positive drive of the subscriber line 15, the first resistor 6, the secondary circuit of the second telephone set 17, the second resistor 7, the negative wire of the subscriber line 15,

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plus a power source 19, a first resistor 6, a talk circuit of the second telephone 17, a fourth relay 4, minus the power source 19. The parameters of the circuit are chosen in such a way that the voltage on the first resistor 6 exceeds the response voltage of the third relay 3. Since transistor 18 is turned on according to the emitter follower circuit, the third relay 3 operates. Contact | 3 of the third relay 3 closes and the first relay 1 is activated, having turned on between the plus and minus source 19 of the power supply. By switching the contact 9 of the first relay 1, the ring of the first telephone 16 is disconnected from the subscriber line 15 and connected via diode 5 to the second relay 2. The contact 11 of the first relay 1 connects the first input of the second telephone 17 to the negative wire of the subscriber line 15. Contact 10 of the first relay 1 connects the second input of the second telephone set 17 to the positive wire of the subscriber line 15. Thus, the second telephone set 17 is included in the subscriber line 15.

When contact 10 of the first relay 1 from the power source 19 is closed, the fourth relay 4 is activated through the talk circuit of the second telephone set 17, and contact 14 blocks contact 13. The voltage on the first resistor 6 becomes zero, the third relay 3 de-energizes, and contact 13 of the third relay 3 opens. The first capacitor 8 reduces the voltage drop rate on the third relay 3 and ensures the opening of the contact.

13th third relay 3 after closing contact 14 of fourth relay 4.

At the end of the conversation from the second telephone 17, its conversational circuit is broken, and the fourth relay 4 is de-energized. This causes the contact to open.

14th relay 4 and de-energizing the first relay 1. The device returns to its initial state.

If during the conversation from the second telephone set 17 a handset is lifted on the first telephone set 16, then the second relay 2 will work through its talk circuit and diode 5, the power supply of the first relay 1 will break to its contact. the relay 1 second telephone set 17 is disconnected from the subscriber line 15 ,. and through the normally closed contact 9 of the first relay 1, the first telephone set 16 is connected to the subscriber line 15. The second capacitor 20 delays the release of the second relay 2 so that the contact 12 of the second relay 2 closes after opening the contact 14 of the fourth relay 4.

If during the conversation from the first telephone set 16, the handset is lifted on the second telephone set 17, the state of the circuit will not change. This is due to the low voltage in the subscriber whether

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the power source, the third and fourth relays with the corresponding contacts, the transistor and two resistors are introduced, the output of the first telephone set is connected to the minus of the subscriber line via the first first contact disconnecting device and the anode of the diode, the cathode through which serially connected second relay, the closing contact of the third relay, the fourth relay and per10

You resistor is connected to the subscriber line minus, plus the subscriber line is connected to the input of the first telephone set and through the first relay connected in series, opening contact of the second relay,

15, which decreases to a value of 20 make contact of the fourth relay

connected to the minus of the power supply, the first output of the fourth relay and the collector of the transistor, the base of which is connected to the first output of the second resistor, the first output of the closing second contact of the first relay and through the second telephone set to the first output of the first resistor, which is bridged by the closing third contact of the first relay , the emitter of the transistor through the third relay is connected to the plus of the subscriber line, the second output of the second resistor, the second output of the closing second contact of the first relay and the plus source pi About 6 V when the first telephone set 16 is connected to it, in this case the voltage drop on the first resistor 6 is lower than the response value of the third relay 3, which excludes the possibility of the first relay 1 triggering and the first telephone 16 disconnecting from the subscriber line 15.

Thus, a higher priority is given to the first telephone set 16.

Claims (1)

Claims An apparatus for combined switching on telephone sets comprising a subscriber line, a first relay with first, second and third contacts, a second relay with a contact, a diode and two capacitors, different in order to ensure independent operation of one of the telephones . Fongh devices with one number, fourth relay make contact connected to the minus of the power supply, the first output of the fourth relay and the collector of the transistor, the base of which is connected to the first output of the second resistor, the first output of the closing second contact of the first relay and through the second telephone set to the first output of the first resistor, which is bridged by the closing third contact of the first relay, the emitter of the transistor through the third relay is connected to the plus of the subscriber line, the second output of the second resistor, the second output of the closing second contact of the first relay and the plus of the power source a40 through which the first capacitor is also connected to the emitter of the transistor, the first output of the second capacitor is connected to the cathode of the diode, the second output of the second capacitor is connected to the second output of the second relay and the second output of the break contact of the second relay.