RU1794279C - Telephone commutator - Google Patents

Abstract

A telephone switchboard refers to a prepaid telephone service. The purpose of the invention is the expansion of the functionality of the telephone switchboard by introducing direct communication organizations among themselves without the help of an operator, into a telephone switchboard containing buttons 2 for switching on direct subscribers, a power source, a ring signal regulator 27, a time relay 7, subscriber sets 1 made on switching relays, a dialing pulse counter 11, calling keys of subscribers 4 and an operator 5, blocking block 10, a line key 6, a busy signal generator 25, trigger 9, OR element 8, comm tiruyuschie relays 20 - 24. The operator osuschest- vlyet connection straight subscriber switching relay with the keys incorporation straight subscribers, - actuating trigger counter dial pulses. Subscribers make a call to the operator and other subscribers using the dialer of the telephone. In this case, the triggers of the dial pulse counter are activated by dialing pulses, 4 ill ..

Description

The invention relates to telephone communications and can be used in the construction of an institutional communications network for direct communication between direct subscribers; ... -; -. ; ,

An object of the present invention is to expand the functionality of a telephone switchboard by introducing direct communication with each other without operator assistance. FIG. 1 shows a structural diagram of a telephone switch; in FIG. 2 is an electrical circuit diagram of a line occupancy key; Fig. 3 is an electrical circuit diagram of a blocking unit; in Fig. 4 - electrical principle. circuit pulse counter dialing,

The device contains M subscriber sets 1, M buttons 2 for switching on direct subscribers, M diodes Z. M calling keys 4 subscribers, calling key 5 operator, key 6 busy line, relay 7 time, element OR 8, trigger 9 , blocking 10 block, counter 11 pulses, first 12, second .13, third 14 resistors, indicator 15, capacitor 16 first 17, second 18, third 19 diodes, first switching relay 20 with contact group 20-1 for short circuit and contact group 20-2 for switching, the second switching relay 21 with contact group 21-1 for short circuit and contact group 21-2 for switching, the third switching relay 22 with the contact group 22-1 for short circuit, the fourth switching relay 23 with the first 23-1 and the second 23-2 contact groups for short circuit, the fifth switching relay 24 with contact group 24-1 to switch, the signal generator 25 is busy, the power supply 26, the ring signal generator 27, the talk line 28, the first 29 and second 30 wires of the subscriber line.

The line occupation key 6 of FIG. 2 contains an OR element connected in series, made on diodes 3-1, 32, an integrating circuit consisting of resistors 33, 34, a capacitor 35 and a transistor switch containing a transistor 36, a resistor 37. Integrating parameters the circuits are selected such that when the dial pulses are applied to the input, the key is constantly on.

The blocking block 10 of Fig. 3 contains a D-flip-flop 38, a diode 39, an integrating circuit consisting of resistors 40, 41, a capacitor 42 and a transistor switch containing a transistor 43, resistors 44.45. With this C, S, P, the inputs of the trigger 38 are respectively the first, second, and third inputs of the locking device 10. The parameters of the integrating circuit are selected such that potential 1 at the output of the device. lock 10 is set one second after the trigger 3.8 is turned off. Taka

the amount of delay is associated with the duration of dialing the longest O number and received in order to prevent a fake call.

The dial pulse counter 11 is a shift register assembled on D-flip-flops 46, 47, 48, 49, the P inputs of which are combined and are the second input of the dial 11 counter, and the S inputs and outputs of the triggers 47, 48 are respectively5 Actually, the M inputs and M outputs of the dialing pulse counter 11, the M + 1 output of which is the trigger output 49. The execution of the dialing pulse counter 11 on the shift register allows one switching relay (2-1,22) to be switched on via the corresponding keys 4, 5 using dialing pulses applied to the first input counter and 11 impulses of the set (combined With the inputs of the triggers 46,47,48,49) go several

5 switching relays 21 of subscriber sets 1 by means of buttons 2 for switching on direct subscribers connected to the M inputs of the counter 11 dial pulses (trigger inputs 47. 48).

0 Call keys of 4 subscribers and call key 5 of the operator are made according to the AND-NOT scheme:

Indicator 15 is made on the LED. The second is the conversational line of the operator,

5 the second wires of the ringing signal generator and the signal generator are alternately connected to the negative pole of the power supply 26 by alternating current.

The telephone switch operates as follows.

Source mode. Handsets of subscriber telephone sets lie on levers, DC input resistance of telephone sets

5 are infinite, therefore, no current is supplied from the power source to the line. The voltage drop at the first resistor 12 is zero and is applied to the first input of the line occupancy switch 6. The contacts of the buttons 2 of the direct subscribers are open, therefore, there are no signals at the M inputs of the counter 11 of the dial pulses, the second input of the trigger 9, the input of the time relay 7 and is equal to logical zero. At the same time relay 7

5 is turned off and a logic zero signal from its output is supplied to the second input of the busy key 6. Since the signal is equal to logical zero at the first and second inputs of the key to take the line, it is closed and the signal at its output is equal to a logical unit.

This signal is applied to the V-th input of the counter 11 of the set pulses, the first input, trigger 9, the second input of the OR element 8, the second input of blocking unit 19 and sets them to the initial state, at which the output of blocking flea 10, the second output of the trigger 9, a logical zero signal is present at the M + 1 outputs of the dialing pulse counter 11, and from the output of the OR element 8, the logical unit signal is supplied to the 10 first outputs of the direct power on buttons 2.

The calling keys of the 4 subscribers and the calling key of the operator 5 are closed, since a logic zero signal is supplied to their inputs. fifteen

In this case, the first 20, second 21, third 22, fourth 23 and fifth 24 switching relays are in the off state, since current does not pass through their windings.

. Communication between direct subscribers is carried out as follows.

. The subscriber picks up the phone. In this case, the first switching relay 20 of this subscriber set 1 is turned on by the circuit: positive pole 25 of power supply 26, normally closed contacts 24-1, first diode 17, winding

the first switching relay 20, the third diode 19, the first subscriber line wire 29, the telephone, the second subscriber line wire 30 30, the third resistor 14, the first resistor 12, the negative pole of the power supply 26. The voltage drop across the first resistor 12 includes the first the key is occupied by line 6 and the potential 35 is set to its output. Thus, the initial setting signal is removed from the second input of blocking unit 10, from the second input of dialing pulse counter 11 and from the first input of trigger 40 ra, and at the outputlementa IL AI 8 is set to a logic zero potential. The fifth switching relay 24 is also switched on, by its contacts 24-1, switching the positive pole 45 of the power supply 26 from the second terminals to the sixth terminals of the subscriber sets 1 without breaking the circuit. Having worked, the first switching relay 20 is blocked by its closing contacts 20-1, and by its switching contacts - 50 cycles 20-2 connects the first wire 29 of the subscriber line through the capacitor 16 to the combined first conclusions of the subscriber sets 1.

When the handsets are picked up by 55 other subscribers, the first switching relays 20 of their subscriber sets 1 will not turn on. since the power of the second terminals of the subscriber sets 1 is turned off and the subscribers hear a signal

stepping through normally closed contacts of contact groups 21-2 and 20-2.

The subscriber dials the number. The voltage drop across the resistor 12 is pulsating to the dial. The dialing pulse counter 11 calculates the number of pulses and feeds the logical unit to the first input of the corresponding calling key 4. During dialing, the line busy key 6 is constantly on and through the resistor 13 and diode 18 keeps the first switching relay 20 of the subscriber set 1 in the on state .

Block 10 will be turned off by a dialing pulse at the first input and, after one second, the logical unit potential will be established at its output.

Thus, a logic unit signal is supplied to both inputs of the called key 4 of the called party. The calling key 4 includes a second switching relay 21, which with its make contacts 21-1. prepares the circuit to turn on the first switching relay 20 of this subscriber set 1, and with its switching contacts 21-2 connects a ring signal generator 27 through normally closed contacts 20-2 and a capacitor 16 to the first wire 29 of the subscriber line. The first switching relay 20 from the alternating ring voltage does not work, since the third diode 19 is connected in series with the winding. Having received the call, the subscriber picks up the handset. The first switching relay 20 is turned on in its subscriber set 1 and with its switching contacts 20-2 disconnects the ring signal generator 27 from the capacitor 16 and connects it to the first output of the subscriber set 1. Thus, both subscriber units are connected by alternating current to the combined first terminals of the subscriber set sets 1,

The indicator 15 of the subscriber set 1 is turned on by a constant or alternating voltage when current flows through the second resistor 14. When the subscribers communicate with each other, the indicators 15 are disconnected from the power source by normally open contacts 22-1 and 23-1. Therefore, in this mode, there is no call and connection indication. At the output of the OR element 8, the signal is logic zero. Therefore, the operator will not be able to connect to the conversation by pressing the direct power on buttons 1.

After the conversation, the subscribers put the handsets on the telephone, the current in the line will cease to flow. The voltage drop across the first resistor 12 will be zero. The busy key 6 will turn off. The initial mode will be established. ....

When the subscriber calls the operator, the operator's calling key 5 is turned on and the third switching relay 22 is turned on, which with its make contacts 22-1 connects the negative pole of the power supply 26 to the indicators 15, while the indicator 15 of the calling subscriber is constantly on. With M + 1 the output of the dialing pulse counter 11, it is logical; the unit through the OR element 8 goes to the direct power buttons 2, the operator presses the caller's button 2, the logical unit via diode 3 turns on the trigger 9, the fourth switching relay 23 is activated and with its closing contacts 23-2 connects the operator’s talk line 28 to the first outputs of the subscriber sets 1. When the button is pressed, the time relay 7 is turned on and the enable signal is supplied to the second input of the busy key 6 without affecting the operation mode, how it is turned on at the first entrance. :

The dialing pulse counter 11 also activates the second switching relay 21 of the caller through the calling key 4. At the same time, it does not affect operation, since its make contacts 21-1 are connected in parallel to closed contacts 20-1, switching contacts 21-2 are disconnected by switching contacts 20-2.

After 10 seconds, the time relay 7 turns off.

After the conversation, the subscriber will put the handset on the telephone. Current in the line will cease to flow. The voltage drop across the first resistor 12 will be zero. The busy key 6 will turn off. The initial mode will be established.

To call the subscriber, the operator presses the corresponding power button 2

direct subscriber. The potential unit from the output of the OR element 8 through the contacts of the corresponding button 2 is supplied to be connected to the corresponding M input

5 of the counter 11 dial pulses, and through the corresponding diode 3 turns on the timer 7 and trigger 9., At the second output of trigger 9, a potential unit is set, which is fed to the third input of the OR element

10 8 and to turn on the blocking block 10 to the third input, Having worked, the time relay 7 gives a signal to turn on the key

lines. After the time due to the integrating circuit, the key 6 occupy the line

15, the unit signal is turned on and removed from the blocking unit 10, the dial pulse counter 11, the trigger 9, the OR elements 8. The dial pulse counter 11 and the trigger 9 remain in a stable state.

0 due to pressing the corresponding button 2 to turn on the direct subscriber.

The operator presses the direct subscriber enable button 2. Block 10 locks off potential one from the second

5 of trigger output 9. The corresponding subscriber call key 4 is turned on. The caller is called as if the caller were calling. The trigger 9 with the first output includes a fourth switching relay 23, which 0 with its make contacts 23-1 connects the negative pole of the power supply 26 to the indicators 15. The indicator 15 of the called party flashes in time with the call. If within 10 seconds

5, since the subscriber has not picked up the handset, a potential zero will appear at the output of the time relay 7, the line busy key 6 will turn off. The initial mode will be established. If during this time the subscriber picks up the handset, then the connection is established as if the subscriber called the operator.

Thus, the presented device allows communication between the operator and direct subscribers, as well as

45 direct subscribers to each other without operator assistance.

Claims (1)

SUMMARY OF THE INVENTION A telephone switchboard containing M subscriber sets, the first terminals of which are combined, the second are also combined, and the third combined terminals are connected to a ring signal generator, power supply, operator talk line, M diodes. M buttons, including direct subscribers, the first outputs of which are combined, and the second through the corresponding diodes are combined and connected to the input of the time relay, each subscriber set contains the first and second switching relays, subscriber line, indicator, capacitor, diodes, and the first output of the winding the first switching relay is connected to the first terminal of the first diode, the second terminal of which is the second terminal of the subscriber set, characterized in that, in order to expand the functionality of the telephone switch at the expense of introducing the organization of communication of direct subscribers with each other without the help of an operator, a dialing pulse counter, M calling keys of subscribers, an operator calling key, a blocking block, a line busy key, a trigger, an OR element, a signal generator are busy, the third / the fourth, fifth switching relays, resistors, while the combined fourth outputs of the subscriber sets are connected to the first input of the dial pulse counter, the first input of the blocking block and the first input of the busy key, and through the first resistor to the negative a power supply pole, to which are also connected via parallel connected first make contacts of the third and fourth switching relays, fifth combined, subscriber set leads, the positive pole of the power supply is connected to the first terminals of the second, third, fourth and fifth switching relays and through the switching contacts of the fifth switching relay to the combined second and combined sixth terminals of the subscriber sets, respectively. Actually, the M outputs of the dial pulse counter are connected to the first - inputs of the corresponding M calling keys of the subscribers whose outputs are connected to the seventh: and outputs of the corresponding M subscriber sets, and the (M + 1) th output of the dial pulse counter is connected to the first input of the element OR and the first input of the operator’s calling key, the output of which is connected to the second output of the winding of the third switching relay, the output of the line occupation key being connected to the first input of the trigger, the second input of the dial pulse counter, and the second conclusions of the winding ki of the switching relay, through the second resistor - with the eight combined outputs of the subscriber sets, as well as with the second input of the OR element and the second input of the blocking block, the output of which is connected to the second input of the calling key of the operator, combined with the second inputs of the calling keys of the subscribers, and the second trigger input is connected to the input of the time relay, the output of which is connected to the second input of the busy key, the first output of the trigger is connected to the second output of the winding of the fourth switching relay, through the second closing Here, contacts of which the first joint terminals connected to the subscriber sets conversational line operator, and a second output latch coupled to the third input blocking block and the third input of the OR element, the output of which is connected to the combined first conclusions of the M buttons for switching on direct subscribers, the second conclusions of which are connected to the corresponding M inputs of the dial pulse counter, and the ninth combined conclusions of the subscriber complexes are connected to the signal generator. each subscriber kit contains a third resistor, and the first and second switching relays contain a contact group for circuit m and a contact group for switching, and the sixth terminal about the kit through parallel-connected contact groups to the closure of the first and second switching relays connected to the first terminal of the winding of the first switching relay, the second terminal of the winding of which is connected to the first terminals of the second and third diodes, while the second terminal of the second diode is the eighth terminal of the subscriber set, and the second terminal of the third diode is connected to the first output of the capacitor and the first wire of the subscriber line, the second the wire of which is connected to the first terminal of the third resistor and the first terminal of the indicator, the second terminals of which are the fourth and fifth terminals of the subscriber kit, respectively, while a third The seventh and fifth outputs of the subscriber set are combined through a group of contacts to switch the second switching relay and through the opening contacts of the contact group to switch the first switching relay. They are connected to the second terminal of the capacitor connected through the make contacts of the contact group to switch the first switching relay to the first output of the subscriber set. the output of which is the second output of the winding of the second switching barely. FIG. 2 Fig, 3, FIG. 4 H outputs