RU2048705C1 - System of automatic telephone exchange - Google Patents

Abstract

FIELD: communication devices. SUBSTANCE: device has telephones 1, power supply 2, oscillator 3, clock 4, synchronization pulse unit 5, input units 6, central processing units 7, control units 8, diodes 9, counting registers 10, keyboard units 11, memory units 12, read- only memory units 13, output units 14. EFFECT: communication between users without central exchange sets and group- communication devices. 1 dwg

Description

 The invention relates to communications and can be used for simultaneous servicing of subscribers.

 Known telephone communication systems containing standard telephones, a four-wire path, codecs, regenerators, interface devices, automatic telephone exchanges, power units, a clock unit and a clock receiver.

 The disadvantage of this system is the presence of expensive group equipment and telephone exchanges.

 The effect of the invention is the elimination of telephone exchanges and group equipment, which reduces the cost of the system.

 In FIG. 1 shows a block diagram of an automatic telephone system.

 An automatic telephone communication system includes telephone sets 1, a power supply 2, a generator 3, a clock pulse generator 4 and a clock unit 5, input units 6, arithmetic-logical synchronization units (ALB) 7, control units 8, diodes 9, counting registers 10, keyboard blocks 11, random access memory (OZB) 12, read-only memory blocks (PZB) 13, output blocks 14.

 The system consists of a cable of type KM-4 (provides the transmission of STV color television broadcasting signals with a frequency spectrum of 50 Hz 6 MHz and SES sound signals with a frequency spectrum of 30-1500 Hz), to which a generator, linear amplifiers and telephone sets are connected.

 The device operates as follows.

In the initial state, the generator 3 gives voltage pulses with a frequency of 500 MHz, for example, 500,000 pulses in L _{1 of the} cable, which corresponds to 500,000 subscriber numbers, with an interval of 10 pulses for synchronization.

Telephone sets 1 are connected to the communication line L ₂ , L _{3 with the} keys of the output unit 14, when the OZB 12 sends a pulse to its input corresponding to its own number stored in the PZB 13.

 If the called subscriber does not pick up, the signal from the call of telephone set 1 falls into output unit 14, which connects the telephone set for a time corresponding to the passage of a clock pulse in a predetermined time interval. The specified time interval, i.e. number of the called subscriber is counted by the counting register 10.

 The counting register 10 with the keys of the key block 11 0,1,2,9 ensures the appearance of "1" at the output only after the counting register 10 counts the number of clock pulses corresponding to the number dialed on the key block 11.

 Clock pulses are fed to the input of the counting register 10 from the output of the control unit 8.

 The number of the called subscriber is dialed in descending order of digits.

 ALB 7 provides the installation of synchronism after turning on the device, monitoring the state of synchronism and its restoration.

 ALB 7 determines the correspondence of the time instant of arrival of the true synchronization group from the generator equipment. The decisive device determines the state of synchronism, the time out of synchronism, controls the operation of the corresponding nodes in the synchronism search mode.

The decisive device contains a drive at the exit from synchronism, a drive at the entrance to synchronism, circuit And _s . The drives at the input and output from synchronism are made according to the counter scheme with a reset. The drive at the output of the clock contains four bits N 1,2,3,4.

 ALB 7 provides protection against false synchronism in the sync group search mode when random combinations of a group signal matching the sync signal are input to the identifier.

 Random code combinations of a group signal, similar in structure to a sync group, do not coincide in time with a control signal and will not affect the operation in synchronism mode.

 Connection to the line of two telephones 1 at one time interval provides communication between them.

Claims (1)

 AUTOMATIC TELEPHONE COMMUNICATION SYSTEM containing telephone sets, the inputs of which are connected to the positive bus of the power source, characterized in that a generator is introduced into it, consisting of a series-connected clock generator and a clock block, input blocks, arithmetic-logical synchronization blocks, the first inputs of which connected to the output of the clock block, control units, the first inputs of which are connected to the outputs of the input blocks and the second and third inputs of the arithmetic-logical blocks, the second and second outputs of which are connected via diodes to the second and third inputs of the control units, counting registers, the inputs of which are connected to the first outputs of the control units, key blocks, the inputs of which are connected to the outputs of the counting registers, random-access memory blocks, the inputs of which are connected to the outputs of the keyboard blocks, the first and second outputs of random-access memory blocks through diodes are connected to the fourth inputs of the control units and the third outputs of the introduced read-only memory blocks, the outputs of which are connected to the output dams of counting registers, and the first and second outputs of permanent storage units through diodes are connected to the third inputs of control units, output units, the first inputs of which are connected to inputs of telephone sets, the second inputs to outputs of telephone sets, and the third inputs with third outputs of random access memory blocks, the outputs of the output blocks are connected through diodes to the negative bus of the power source.