RU2067356C1 - Office automatic phone exchange station with temporal-pulse channel sharing - Google Patents

Abstract

FIELD: telephone devices. SUBSTANCE: pulse-duration modulator 4 for group digital voice signal, pulse-duration demodulators 33(1)-33(n) for corresponding individual channels, access units which has different type line sets 32(1)-32(n) are introduced to accomplish goal of invention. EFFECT: unit design of line sets, pulse-duration modulation, increased functional capabilities, increased flexibility in use, increased stability to noise. 1 dwg

Description

 The invention relates to telephony, in particular, to devices for switching communication channels using the principle of pulse-time separation of channels (IWRC).

 Known electronic PBX with IVRK / 1 / containing subscriber kits, bus switches, talk bus, signal generator, control device and auxiliary switching unit, and the corresponding outputs of the subscriber sets are connected respectively to the corresponding inputs of the control device and bus switches, the outputs of which are connected to the talk the bus, the outputs of the signal generator are connected to the first group of inputs of the auxiliary switching unit, the outputs of which are connected to the control inputs of the switch in tires, and outputs a control device connected to the second group of inputs of the auxiliary switching block, which provides subscribers voice signal pulse distribution by a two-wire bus conversational. At the same time, calculations and experimental verification show that the attenuation of the spoken path even with a small number of pulse-time channels in the station section of the path significantly exceeds the norm established for the working attenuation of the exchange. In addition, there are strong transient effects between channels. This requires the introduction of additional devices to compensate for the attenuation introduced by the PBX with IVRK.

 The closest technical solution, selected as a prototype, is an electronic automatic telephone exchange with a pulse-time division of channels / 2 /, containing switches for transmitting and receiving, conversational buses for transmitting and receiving, a control device, a signal conditioner, an auxiliary switching unit, subscriber sets that contain differential systems, amplifiers, and low-pass filters in the receive path, with four-wire inputs and outputs of subscriber complexes connected respectively to the transmit and receive switches and, which are connected to the talk buses of the transmission and reception, the control device is connected respectively to subscriber sets and control inputs of the auxiliary switching unit, the inputs of which are connected to the signal shaper, and the outputs to the control inputs of the transmit and receive switches, which provide compensation for the attenuation introduced by the station by low frequency amplifiers installed in the receiving path of each subscriber set.

 The disadvantages of the prototype are the presence of noise and a transient effect between the channels in the station paths, as well as the inability to interact with other exchanges when using the station as an institutional one.

 The technical effect consists in expanding the functionality and operational flexibility of an office automatic telephone exchange with pulse-time separation of channels and increasing the noise immunity of a speech signal by modularly constructing a set of linear sets and introducing a pulse-width modulation mode of speech signals.

 The drawing shows a structural diagram of an office PBX with a pulse-time separation of channels.

 Institutional ATS contains conversational buses for transmitting 2 and receiving 3, pulse-width modulator 4, decoders for transmitting 5 and receiving 6, scanner 7 and configuration 20, processor 8, signal conditioner 9, multiplexer 10, constant 11 and operational 14 memory blocks, control units transmission 12 and reception 13, input / output ports of transmission 15, reception 16 and scanner 18, register 17, block 19 of the administration I / O ports, first 21 and second 30 data buses, first 22, second 25 and third 26 address buses, first 23 and the second 31 control buses, bus 24 tones, bus n ometers of transmission 27 and reception 28, bus 29 of the scanner, access blocks 1.1-1, which contain linear kits 32.1-32.n, demodulators 33.1-33.n, transfer switches 34 and reception 35, scanner 36. The PBX operates as follows.

 Modules 1.1-1. m accesses are designed to provide access for PBX subscribers with IWRC and subscribers of external exchanges, through subscriber lines of an external exchange as connecting lines, to the switching equipment of the station.

 Conversational bus 2 transmission combines conversational modulated signals from modules 1.1-1.m access into a group conversational signal.

 The talk bus 3 reception provides the connection of the information inputs of blocks 1.1-1.m access to the output of the pulse-width modulator 4.

 Pulse-width modulator 4 converts a group discrete signal into a group of a pulse-width modulated speech signal.

 Transmit decoder 5 (reception 6) is designed to determine (decrypt) the number of the transmission switch 34 (reception 35) currently working on transmission (reception).

 The descrambler 7 of the scanner is designed to determine (decrypt) the number of the scanner 36 currently serving the subscriber.

 The processor 8 is designed to control the processes of service calls, as well as to provide additional types of services.

 The signal conditioner 9 generates signals for controlling the station units according to processor commands, tones, and also generates the addresses of the control units for transmitting 12 and receiving 13.

 The multiplexer 10 is designed to switch the address inputs of the control units for transmitting 12 and receiving 13 to the first 22 and second 25 address bus.

 Permanent storage unit 11 is designed for permanent storage of information used during operation of the station.

 The transmission control unit 12 (reception 13) is intended for temporary (during a call) storage of numbers of pairs of subscribers working on transmission (reception).

 The operational storage unit 14 is designed to store work programs and data used by the programs.

 The input / output port of transmission 15 (reception 16) sets the numbers of pairs of talking subscribers from the first data bus 21 to the control transmission unit 12 (reception 13), and also connects the information outputs of the control transmission units 12 (reception 13) to the first data bus 21 for monitoring the correctness of the information recorded in them.

 Linear kits 32.1-32.n are intended for matching a two-wire subscriber line with a four-wire station termination, transmitting information about the position of the subscriber’s handset and dialing pulses to the scanner 36, and also receiving relevant information from the scanner 36 for transferring it to the line.

 Demodulators 33.1-33. n are designed to convert a pulse-width modulated signal from the receive switch 35 to a low frequency signal.

 The transfer switch 34 is designed to convert subscriber signals into a group discrete signal.

 A receive switch 35 is designed to distribute a group of width-modulated signal to the corresponding demodulators 33.1-33.n.

 The scanner 36 is designed to monitor the status of the subscriber and exchange relevant information with him.

 Static operation mode of the station.

 In the initial state, when the PBX does not receive calls from the subscriber lines and the external station, after turning on the PBX power, the subroutine for determining the configuration of the PBX (number and type of access blocks 1.1-1.m by type of line sets) is launched according to the information on the first data bus 21 from the decoder 20 signals about the availability of access blocks 1.1-1.m.

 At the end of this subprogram, a test program is launched that provides a test of the operability of the main units of the station. When they are operational, zeros are recorded in the cells of the control units for transmitting 12 and receiving 13.

 After passing the test program, the station goes into operating mode. When this starts the scanner 36. The processor 8 exposes on the first data bus 21 the number of the next monitored linear set. The signal conditioner 9 generates a signal for writing to the register 17 the number of the monitored set from the first data bus 21. From the output of the register 17, this number is received on the scanner bus to the decoder 7 of the scanner and scanners 36 blocks 1.1-1 access. The scanner decoder 7 enables the scanner 36 of this unit to operate, which will test the state of the indicated linear set and transmit information about its state via the second data bus 30 through the scanner input / output port 18 to the first data bus 21, which is read by the processor 8 by the corresponding control signals of the signal shaper 9. In the absence of a call from the line kit, processor 8 enables control of the next line kit.

 Dynamic mode of the station.

 The station provides the following call service modes: intercom, outgoing communication, incoming communication and additional types of service.

 Intercom.

 When the subscriber picks up the handset, a signal appears at the scan output of the corresponding line kit 32.1-32.n. In the next clock cycle, this signal is transmitted by the scanner 36 to the second data bus 30 and then through the input / output port of the scanner 18 to the first data bus 21 and is read by the processor 8. If the handset is off-hook for at least 500 ms, then the processor 8 records in the random access memory block 14, the state change of this line kit 32.1-32.n and the subscriber receives a signal "Station response".

 The tone signals (TS) generated by the signal shaper 9 are sent via the 24 tone signal bus to the scanners 36 of all 1.1-1.m access units, which are delivered to the 32.1-32.n line kits by the scanner 36 as necessary. To control the issuance of the required TS, the processor 8 sets the subscriber number and the number of the vehicle on the first data bus 21. The subscriber's number is recorded in register 17 and through the scanner bus 29 goes to the scanner decoder 7 and the scanners 36 of the access blocks 1.1-1.m, but is only perceived by the scanner 36, whose operation is allowed by the decoder 7. This scanner 36 decrypts the line kit number 32.1-32 . n and provides switching the scan output to it. The vehicle number through the input / output port 18 of the scanner and the second data bus 30 is transmitted to the scanners 36 of the access blocks 1.1-1.m, but is perceived by the working scanner 36, is decrypted, stored for the time the signal is supplied, and fed into the linear set 32.1-32.n through prepared scan output.

 The number dialed by the subscriber is transmitted by the scanner 36 through the input / output port 18 of the scanner to the first data bus 21, from which it is read by the processor 8, which determines the presence of free pairs of temporary positions in the talk buses of transmission 2 and reception 3, as well as the status of the called subscriber.

 The free time position is the address of the control units of transmission 12 and reception 13, at which the zero number is recorded. To ensure two-sided heating, a pair of free temporary positions is required. If there is a free pair of temporary positions, the processor 8 determines the state of the called subscriber.

 The processor 8 determines the state of the called subscriber by the information recorded in the random access memory 14, after which the “Call” is sent to the called subscriber from the line kit 32.1-32.n of the corresponding access unit 1.1-1.m, and the caller is called “Call Control”. The transmission of these signals is carried out similarly to the feeding algorithm of the TS "Station Response".

 After picking up the handset by the called subscriber, the processor 8 records the numbers of the called and the calling subscribers in the control blocks of transmission 12 and reception 13, and also removes the signals "Call" and "Control of the call."

 Recording the numbers of the called and calling subscribers is as follows. The processor 8 sets the number of the free temporary position on the first address bus 22. A signal is supplied from the signal shaper 9 to the control input of the multiplexer 10, through which the address inputs of the multiplexer 10 are switched to the first address bus 22. Thus, the address inputs of the control devices for transmitting 12 and receiving 13 are connected to the first address bus 22. The processor 8 sets the number of the calling (called) subscriber to the first data bus 21, from which the number is transmitted via the transmission input-output port 15 (reception 16) to the transmission number bus 27 (reception 28) and from it to the inputs and outputs of the transmission control devices 12 (admission 13) is recorded in the last relevant numbers.

 This completes the process of establishing a connection.

 The conversation path in this case is formed along the following chain: linear set 32.1-32. n of the caller, the transfer switch 34, the talk bus 2, the pulse width modulator 4, the talk bus 3, the reception switch 35 of the corresponding access module 1.1-1, the corresponding demodulator 33.1-33. n line kit 32.1-32.p called party. Maintaining the conversational path is provided by supplying addresses from the shaper 9 to the control devices for transmitting 12 and receiving 13 through the multiplexer 10.

 If the called party is busy or there are no free temporary positions, the busy signal is sent to the calling party.

 At the end of the conversation, the station provides two-way hang up. At the same time, the state of the end of the conversation is determined by the processor 8 by means of signals from the scanner 36 of the corresponding access module 1.1-1. Temporary positions occupied by subscribers are freed. A subscriber who does not hang up receives a busy signal.

 Outgoing call.

 The outgoing call establishment algorithm has the following differences from the internal connection servicing algorithm. When a subscriber dials a number, processor 8 analyzes the first digit, determining the type of connection and the right to outgoing communication. If possible, access to an external station, the processor 8 determines, in addition to the presence of a free pair of temporary positions, the state of the connecting lines. If there is free, a conversation path is established in the station according to an algorithm similar to that described for intercom, which is held for the duration of the conversation, and in the 32.1-32.p line kit of the corresponding access module 1.1-1.sh, the subscriber picks up the phone towards the external station. Then, the corresponding TSs arrive from the external station to the calling subscriber, and the process of establishing a connection with the external station continues, and dialing pulses are transmitted through the corresponding scanner 36 through a circuit similar to the broadcast of the TS. An outgoing call is one-way, in which control is carried out for the subscriber of his station.

 Incoming call.

 The incoming connection establishment algorithm has the following differences from the internal connection service algorithm. When the scanner 36 scans the corresponding linear sets 32.1-32.p, which provide pairing with the subscriber line of the external telephone exchange, a signal is received about the arrival of the inductor call and transmitted to the processor 8, which provides loop closure in the subscriber line during the pause of the inductor call. An external telephone exchange, receiving this information, goes into talk mode. At the same time, the processor 8 sends a “Station Response” signal to the subscriber line of the external telephone exchange, after which it switches to the service mode corresponding to the internal communication. In this case, the reception of the number is carried out by the scanner 36 not according to the loop break, but according to the pulses in the subscriber line of the external station, which the scanner 36 converts into dialing pulses. End call is the same as outgoing call.

Claims (1)

 An office automatic telephone exchange with a pulse-time division of channels, containing switchboards for transmitting and receiving, conversational buses for transmitting and receiving, a signal shaper, and the switchboards for transmitting and receiving are connected respectively to conversational buses for transmitting and receiving, characterized in that a pulse-width modulator is introduced, transmission decoder, reception decoder, scanner decoder and configuration decoder, processor, multiplexer, read-only and read-only memory blocks, control unit in front of Achi and control unit for reception, transmission input-output port, reception input-output port and scanner input-output port, register, administration input-output port block, first and second data buses, first, second and third address buses, first and second control buses, tone bus, transmission number bus, reception number bus, scanner bus, access units that contain linear kits, demodulators, a scanner, the processor being connected via a first control bus and a first address bus to a signal conditioner whose address outputs are Via the second address bus, they are connected to the first inputs of the multiplexer, the second inputs of which are connected to the first address bus, to which the permanent and operational memory blocks are connected, which are connected via the first data bus to the processor, the corresponding control outputs of the signal shaper are connected respectively to the control inputs of the constant and operational storage blocks, input / output ports of transmission and reception, register, block of administration input / output ports, configuration decoder, control units ne supply and reception, a multiplexer, the outputs of which through the third address bus are connected respectively to the address inputs of the transmission control unit and the reception control unit, the data inputs and outputs of which are connected to the reception number bus, to which the reception I / O port, reception switches of access units and receiving decoder, the outputs of which are connected to the control inputs of the receiving switches of the access units, the corresponding outputs of which are connected through demodulators to the inputs of the four-wire end of linear sets cts, the outputs of the four-wire end of which are connected to the corresponding inputs of the transfer switch of the access unit, the data input-outputs of the control unit of the transmission are connected to the bus of the transmission numbers to which the input / output port of the reception, the transfer switches of the access units and the transfer decoder are connected, to the corresponding outputs of which are connected the control inputs of the transfer switches of the access blocks, the transmission input / output port, the receive input / output port and the scanner input / output port, a register are connected to the first data bus a configuration demodulator and an administration I / O port block, the control inputs of which are connected via the second control bus to the corresponding outputs of the signal driver, the corps outputs of the access blocks are connected to the information inputs of the configuration demodulator, the scanner I / O port is connected to the scanners of the access blocks via the second data bus , to the outputs of the tonal signals of which a signal former is connected via the tone bus, and the register is connected via the scanner bus to the scanners Cove access and decoder scanner, information outputs of which are respectively connected to the control input scanner respective access units.