RU2234817C1 - Hot-link telephone exchange - Google Patents

Abstract

FIELD: electrical communications; organization of hot link between subscribers of stationary and mobile centers through telephone exchange.

SUBSTANCE: hot-link telephone exchange has line input unit; subscriber distribution frame unit; unit of sets of subscriber lines; switching field unit; servicing instruments unit, numeric control unit; special-purpose control device assembled of three peripheral control units, random-access memory, central control unit, program memory unit, and program selection unit; workstation unit; data display unit; channel sets unit; transit connection unit; unit of sets of connecting lines; differential-systems unit; unit of automatic voice-conversion devices; interface unit; channel input unit; channel switching unit; group data encryption unit; digital-channel switching unit; interaction signal unit; voice-frequency signal conversion unit; individual data encryption unit; unit of sets of transfer lines; subscriber lines; connection lines; voice-frequency channels; digital channels, and transfer lines. Newly introduced in telephone exchange are numeric control unit and special-purpose control device assembled of three peripheral control units, random-access memory unit, central control unit, program memory unit, and program selection unit. Proposed telephone exchange incorporates provision for built-in functional check and for adapting its operation to varying operating conditions.

EFFECT: enhanced operating reliability and speed, improved quality of servicing subscribers, enhanced efficacy of establishing communications.

1 cl, 1 dwg

Description

The invention relates to telecommunication technology and can be used to organize operational telephone communication between subscribers of fixed networks and subscribers of mobile communication nodes.

Known terminal telephone exchange for local communication networks and a device that provides access to trunk lines for telephone installations of the intercom system, containing telephone sets, subscriber sets and sets of trunk lines, tokens of subscriber and register searches, switching units, subscriber telephone installations and intercom settings [1,2].

However, these devices provide service to subscribers of only local networks and have low bandwidth, which limits the possibility of their use for operational communication.

Closest to the technical nature of the present invention is a telephone exchange operational communications described in [3].

This station contains a line input unit, a subscriber cross unit, a set of subscriber line sets, a switching field unit, a unit of service devices, a control device, a workstation unit, an information display unit, a channel set unit, a transit connection unit, a connecting line unit block, a differential unit systems, a block of automatic speech-converting devices, a pairing block, a channel input block, a channel switching block, a group information encryption block, a digital channel switching block, bl ok interaction signals, tone frequency signal conversion block, individual information encryption block, transmission line sets block, subscriber lines, trunk lines, tone frequency channels, digital channels and transmission lines.

The well-known telephone exchange of operational communications provides internal connections on subscriber lines, outgoing and incoming connections on connecting lines from other stations, outgoing, incoming and transit connections on long-distance communication channels and encryption of information transmitted on long-distance communication channels.

The main disadvantage of the known telephone exchange of operational communications is that it does not provide the ability to automatically diagnose the state of the switching equipment of the station, which is why considerable time is spent on finding and eliminating malfunctions that appear during operation, which leads to an increase in failures in the work of the station, decrease in efficiency in establishing a connection and deterioration in the quality of customer service.

The aim of the invention is to improve the quality of customer service and increase the efficiency of communication.

This goal is achieved by the fact that in the telephone exchange of operational communication, containing the line input unit, the inputs and outputs of which are connected to the first inputs and outputs of the subscriber cross unit, the second inputs and outputs of which are connected to the first inputs and outputs of the subscriber line sets block, the second inputs the outputs of which, including conversational and calling circuits of each subscriber set, are connected to the first inputs and outputs of the switching field unit, the second inputs and outputs of which are connected to the first inputs and outputs of the service unit devices, the second inputs and outputs of which are connected to the first inputs and outputs of the workstation unit, the information display unit, the channel sets unit, the first inputs and outputs of which are connected to the inputs and outputs of the transit connection unit, the third inputs and outputs of the switching field unit are connected to the third the inputs and outputs of the channel sets block, the fourth inputs and outputs of the switching field block are connected to the first inputs and outputs of the connecting line sets block, and the fifth inputs and outputs of the switching field block with the first inputs and outputs of the block of differential systems, the second inputs and outputs of which are connected to the second inputs and outputs of the block of sets of connecting lines, the third inputs and outputs of which are connected to the third inputs and outputs of the subscriber cross unit, to which the subscriber and connecting lines, the third inputs and outputs of the unit of servicing devices are connected to the fourth inputs and outputs of the unit of channel sets, the fourth inputs and outputs of the unit of servicing devices are connected to the first inputs m-outputs of the block of automatic speech-converting devices, the second inputs and outputs of which are connected to the first inputs and outputs of the interface unit, the second inputs and outputs of which are connected to the fifth inputs and outputs of the unit of service devices, the signal outputs of the switching field unit are connected to the first inputs of the information display unit, to the second and third inputs of which the signal outputs of the workstation block and channel sets block, the channel input unit with tonal channel channels connected to it are connected cells, the first inputs and outputs of which are connected to the first inputs and outputs of the channel switching unit, the second inputs and outputs of which are connected to the first inputs and outputs of the group information encryption unit, the second inputs and outputs of which are connected to the first inputs and outputs of the digital channel switching unit, the inputs and outputs of which are connected to the first inputs and outputs of the interaction signal block, the second inputs and outputs of which are connected to the second inputs and outputs of the channel sets block, the third inputs and outputs of the channel switching unit c are connected to the analog inputs and outputs of the tone frequency signal conversion unit, the discrete inputs and outputs of which are connected to the fourth inputs and outputs of the channel switching unit, the fifth inputs and outputs of which are connected to the fifth inputs and outputs of the channel sets block via individual information encryption unit, sixth inputs - the outputs of which are connected to the first inputs and outputs of the block of complete sets of transfer lines, to the second inputs and outputs of which through the third inputs and outputs of the block of input channels are connected lines, the tonal frequency channels through the channel input unit, the first and third inputs and outputs of the channel switching unit are connected to the analog inputs and outputs of the tone frequency signal conversion unit, to the third inputs and outputs of the digital channel switching unit through the second inputs and outputs of the channel input unit inputs and outputs of external digital channels are connected, a program control unit and a specialized control device have been introduced, providing the ability to restructure the station in accordance with changing conditions operation and increase the speed of its operation, consisting of the first, second and third peripheral control units, a random access memory block, a central control unit, a program memory unit and a program change unit, the output of the first peripheral control unit being connected to the input of the random access unit, information inputs - the outputs of which are connected to the first information inputs and outputs of the central control unit, the first, second and third control inputs and outputs of which are connected to the first the control inputs and outputs of the first, second and third peripheral control units, the second and third information inputs and outputs of the central control unit are connected to the first information inputs and outputs of the software storage unit and the program change unit, the second information inputs and outputs of which are connected to the second information the inputs and outputs of the software storage unit, and the second, third, fourth, fifth and sixth control inputs and outputs of the first peripheral control unit The connections are connected to the control inputs and outputs of the subscriber line sets block, the information display block, the channel sets block, the connecting line sets block and the transmission line sets block, the second control inputs and outputs of the second peripheral control unit are connected to the control inputs and outputs of the switching field unit, and the second, third and fourth control inputs and outputs of the third peripheral control unit are connected to the control inputs and outputs of the service unit, respectively devices, a workstation unit and a program control unit, the first and second information inputs and outputs of which are connected to additional information inputs and outputs of a switching field unit and a serving device unit, whose additional signal output is connected to the first additional input of the information display unit, the second additional the input of which is connected to the signal output of the program control unit, and the additional inputs and outputs of the switching unit of the digital channels enes with additional digital inputs-outputs individual information encryption unit.

Comparative analysis with the prototype shows that the inventive telephone exchange for operational communications is characterized by the presence of new units: a program control unit and a specialized control device consisting of the first, second and third peripheral control units, random access memory unit, central control unit, software storage unit and program change unit , as well as their relationships with other elements of the circuit.

Thus, the claimed telephone exchange of operational communication meets the criteria of the invention of "novelty." A comparison of the proposed solution with other technical solutions shows that the blocks newly introduced into the proposed station are realizable, well-known to specialists in this field of technology and additional creativity, given the explanations below, for their reproduction is not required.

However, when they are introduced in the indicated connection with the other elements of the circuit into the inventive telephone exchange of the operative communication system, the above blocks exhibit new properties, which include the possibility of automatically monitoring the technical condition and diagnosing the malfunction of its elements in the station, which leads to an improvement in the quality of customer service by eliminating unproductive time spent on troubleshooting and contributes to the efficiency of establishing communications for those included in the station Subscriber, trunk and long-distance communication channels. This allows us to conclude that the technical solution meets the criterion of "significant differences".

The drawing shows a structural electrical diagram of the proposed telephone exchange operational communications.

The telephone exchange of the operative communication system contains a block 1 for inputting lines, a block 2 for a subscriber cross, a block for 3 sets of subscriber lines, a block 4 for a switching field, a block 5 for servicing devices, a specialized control device 6 comprising the first 7, second 8 and third 9 peripheral control units 10 RAM, central 11 control unit, program storage unit 12 and program change unit 13, workstation unit 14, information display unit 15, channel kit sets 16, backhaul connections block 17, bl ok 18 sets of connecting lines, block 19 of differential systems, block 20 of automatic speech-converting devices, block 21, pairing 22 channel input, block 23 switching channels, block 24 group encryption of information, block 25 switching digital channels, block 26 interaction signals, block 27 conversion of tone frequency signals, block 28 for individual encryption of information, block 29 of sets of transmission lines, block 30 of program control, subscriber lines 31, trunk lines 32, tone frequency channels 33, digital Channels 34 and transmission line 35 connection.

Subscriber 31 and connecting 32 communication lines through block 1 input lines are connected to the first inputs and outputs of block 2 of the subscriber cross, the second inputs and outputs of which are connected to the first inputs and outputs of block 3 sets of subscriber lines. The second inputs and outputs of the block 3 sets of subscriber lines, including the voice and calling circuits of each subscriber set, are connected to the first inputs and outputs of the block 4 of the switching field, the second inputs and outputs of which are connected to the first inputs and outputs of the block 5 of service devices. The second inputs and outputs of the unit 5 serving devices are connected to the first inputs and outputs of the unit 14 of the workplace. The signal outputs of the switching field unit 4 are connected to the first inputs of the information display unit 15, to the second and third inputs of which the signal outputs of the workstation unit 14 and the channel sets unit 16 are connected. The first inputs and outputs of the block 16 channel sets are connected to the inputs and outputs of the block 17 transit connections. The third inputs and outputs of the switching field unit 4 are connected to the third inputs and outputs of the 16 channel unit sets, and the fourth inputs and outputs of the switching field unit 4 are connected to the first inputs and outputs of the unit 18 sets of connecting lines. The fifth inputs and outputs of the switching field unit 4 are connected to the first inputs and outputs of the differential system unit 19, the second inputs and outputs of which are connected to the second inputs and outputs of the unit 18 sets of connecting lines, the third inputs and outputs of which are connected to the third inputs and outputs of the subscriber unit 2 cross, to which through the block 1 input lines connected subscriber 31 and connecting 32 lines. The third inputs and outputs of the unit 5 serving devices are connected to the fourth inputs and outputs of the unit 16 channel sets, and the fourth inputs and outputs of the unit 5 servicing devices are connected to the first inputs and outputs of the unit 20 of automatic speech-converting devices, the second inputs and outputs of which are connected to the first inputs - the outputs of the interface unit 21, the second inputs and outputs of which are connected to the fifth inputs and outputs of the unit 5 of the serving devices. The first inputs and outputs of the channel input unit 22 are connected to the first inputs and outputs of the channel switching unit 23, the second inputs and outputs of which are connected to the first inputs and outputs of the group information encryption unit 24, the second inputs and outputs of which are connected to the first inputs and outputs of the switching unit 25 digital channels, the second inputs and outputs of which are connected to the first inputs and outputs of the interaction signal block 26, the second inputs and outputs of which are connected to the second inputs and outputs of the block 16 channel sets. The third inputs and outputs of the channel switching unit 23 are connected to the analog inputs and outputs of the signal conversion unit 27, the discrete inputs and outputs of which are connected to the fourth inputs and outputs of the channel switching unit 23. Moreover, the channels 33 of the tonal frequency through the first inputs and outputs of the channel input unit 22, the first and third inputs and outputs of the channel switching unit 23 are connected to the analog inputs and outputs of the signal conversion unit 27. To the third inputs and outputs of the block 25 switching digital channels through the second inputs and outputs of the block 22 input channels connected inputs and outputs of the external 34 digital channels. The fifth inputs and outputs of the channel switching unit 23 are connected to the first inputs and outputs of the individual information encryption unit 28, the second inputs and outputs of which are connected to the fifth inputs and outputs of the 16 channel sets unit. Additional inputs and outputs of block 25 switching digital channels are connected to additional discrete inputs and outputs of block 28 for individual encryption of information. The sixth inputs and outputs of the block 16 channel sets are connected to the first inputs and outputs of the block 29 of the transmission lines, to the second inputs and outputs of which, through the third inputs and outputs of the block 22 of the input channels, transmission 35 communication lines are connected.

The output of the first 7 peripheral control unit of the specialized control device 6 is connected to the input of the main memory unit 10, the information inputs and outputs of which are connected to the first information inputs and outputs of the central control unit 11, the first, second and third control inputs and outputs of which are connected to the first control inputs - outputs respectively of the first 7, second 8 and third 9 peripheral control units. The second and third information inputs and outputs of the central control unit 11 are connected to the first information inputs and outputs of the software 12 of the storage unit and the program change unit 13, respectively. The second information inputs and outputs of the software 12 storage unit are connected to the second information inputs and outputs of the program change unit 13. The second, third, fourth, fifth and sixth control inputs and outputs of the first peripheral control unit 7 are connected respectively to the control inputs and outputs of, respectively, block 3 sets of subscriber lines, block 15 information display, block 16 channel sets, block 18 sets of trunk lines and block 29 sets of transfer lines.

The second control inputs and outputs of the second peripheral control unit 8 of the specialized control device 6 are connected to the control inputs and outputs of the switching field unit 4. The second, third and fourth control inputs and outputs of the third peripheral control unit 9 are connected to the control inputs and outputs of the service device unit 5, workstation unit 14 and program control unit 30, the first information inputs and outputs of which are connected to the additional information inputs and outputs of the unit 4 switching fields. The second information inputs and outputs of the software control unit 30 are connected to additional information inputs and outputs of the service device unit 5. An additional signal output of the unit 5 serving devices is connected to the first additional input of the information display unit 15, the second additional input of which is connected to the signal output of the program control unit 30.

The input units for lines 1 and channels 22 include connecting elements, connectors, and are designed to connect subscriber, connecting, transmission lines and communication channels, at the other end of which subscriber units and similar stations or terminal devices for conducting telephone conversations and transmitting messages are switched on specified lines and communication channels.

As block 1 input lines and block 22 input channels can be used switching unit BK-2, a block diagram and technical implementation of which are given in [6].

Block 2 subscriber cross contains switching elements and protection elements of the lines and maintenance personnel from dangerous voltages and short circuit currents. It is intended for operational switching of subscriber 31 and connecting 32 lines when they fail, monitoring and measuring parameters of connected lines.

As block 2 of the subscriber cross, the BAK-20F block can be used, the block diagram, the capabilities and technical implementation of which are given in [7].

Block 3 sets of subscriber lines contains linear equipment designed to connect subscriber lines 31 to the switching system of the station, matching them with the switching field, the peripheral control unit 7 of the specialized control device 6 and with the serving devices of the station (cord sets, registers).

It includes subscriber sets (according to the number of connected subscriber lines) designed to receive a call from subscribers, occupy block 7 and transmit information about the number of the calling subscriber to it, transmit a busy signal to the subscriber if the called line or connecting paths are busy, restriction of the subscriber's right to external communication. The subscriber kit may include individual call receivers for each subscriber, differential system, inductor call generator, signal level matching elements, switching elements for switching conversational and calling circuits, composing a conversation path in the process of establishing a connection and communicating between subscribers.

As a block of 3 subscriber sets, a subscriber unit BA-2/4 can be used, the block diagram and technical implementation of which are given in [8].

Block 4 switching field contains switching devices of the stages of subscriber, group and register searches, which include subscriber and linear searchers. To build a switching field, reed relays, ferrides can be used, combined into various types of connectors, from which switching blocks with the required structural parameters are built, designed to connect linear sets to service devices (cord sets and registers) of block 5.

The switching field unit 4 can also be made in the form of switches of various capacities, built on the basis of a matrix coordinate connector or a rectangular matrix. At each switching point, for example, two three-wire polarized reed relay relays of the RES-44 type can be included as actuators. In this case, four wires are used to switch the four-wire conversation path, one wire for signaling and one to hold the switching point.

Variants of the technical implementation of the switching field of block 4 are given in [8].

Block 5 of the service devices contains registers and cord sets (HK) that perform the functions of creating a path for transmitting information, ensuring blocking of the created path for transmitting information, monitoring the end of communication and transmitting various kinds of signals informing the subscriber about the stages of his service by the switching system of the station.

The registers provide the reception of dialing pulses and fix the number of the called subscriber from the calling subscriber, converting it into a form convenient for the marker of the control unit and corresponding to the system for calculating the contact field of switching devices and transmitting the converted address (number) to the marker. The register may include a pulse receiver, a counting circuit, a pulse clamp and a transceiver for exchanging information between the register and the marker, as well as a control and fender device.

The cord set (ШК) is intended for creating in-station paths for transmitting telecommunication signals between the input and output of the switching system in the process of connecting subscriber, connecting lines and long-distance communication channels.

Variants of the technical implementation of the registers and cord sets, as well as the block diagram of the block 5 serving devices are given in [8].

Specialized control device 6 is designed to provide control of the processes of establishing a connection between subscribers, selecting a line and an operating mode along it, bringing station elements to their original state at the end of negotiations. Specialized device 6 in the process of establishing a connection identifies the calling subscriber, issues commands to switch the line of the calling subscriber through the switching field of block 4 to the register of block 5 of the servicing devices, and from the address information received from the register, it determines the way to establish the connection and issues executive commands for making the connection to switching field of block 4.

Specialized control device 6 contains the first 7, second 8 and third 9 peripheral control units, a random access memory unit 10, a central control unit 11, a program memory unit 12 and a program change unit 13. Device 6 is designed to control the station’s functioning processes, including generating, converting, transmitting and receiving control signals, distributing control signals among various functional blocks, determining the status of service devices, line sets and switching field devices, determining rational ways to establish a connection, and including switching points in switching field, diagnostics and prediction of the operation of units and the station as a whole. The program of work and the interaction of the elements of the device 6 is determined by the Central control unit 11.

Each of the three peripheral control units 7, 8 and 9 represents a set of functional blocks that ensure the interaction of the switching equipment of the telephone exchange with a specialized control device 6 and matching control signals in time, frequency and power. Peripheral control units contain subscriber and group search markers, linear identifiers, switching points switching units, a unit for selecting service devices (cord sets and registers), register matching units, service order allocators, etc., as well as memory cells. The subscriber search marker may include a subscriber identity, a communication type identifier, an input type identifier, a number lock, a test device, a code transceiver, a subscriber line sample unit, electromagnet switching circuits for multiple coordinate connectors, and sequence distributors. The group search marker contains an input identifier, a direction identifier, a test device, a code transceiver, and electromagnet inclusion circuits for multiple coordinate connectors.

The specialized control device 6 is as follows.

The state of the switching equipment, servicing devices and the switching system of the station through blocks 7, 8 and 9 is recorded in the block 10 of random access memory, and in the program 12 memory block, the control program adopted for the given period of operation of the telephone exchange is laid down. This program when changing the operating conditions of the station can be replaced by another through block 13 program change.

Peripheral 7 control unit, having received a call from the line kit, provides an address record in block 10 of RAM. The central control unit 11 receives from block 10 information about the calling and called line sets, about the availability of free serving devices, as well as about the possibility of connecting linear sets with serving devices through a switching field. The central control unit 11 from the unit 12 receives information about the rights of the linear sets for a particular connection and the sequence (program) for the implementation of this type of connection. According to this information, the central control unit 11 generates commands to peripheral control units that make the necessary connections.

Block 14 of the workplace is designed to connect terminal devices to subscriber, connecting, transmission lines and communication channels, send and receive calls, as well as negotiating the established path. Block 14 contains a remote control equipped with keys and buttons for selecting linear kits and a COMMUNICATION button for issuing a control command to the control unit 6 to connect the selected input and output in the switching field of unit 4, voice and call devices as part of a handset or handheld microphone with a transmission amplifier and a loudspeaker with an amplifier for receiving, a generator and call receivers, a dialer, with which the operator connects to the side of the channel or subscriber, conducts a survey of subscribers, provides a call ova in channels and communication lines, and also transmits information to the marker about the required connections.

Block 14 of the workplace is connected to lines and communication channels through block 5 of service devices. When reaching the PBX subscribers, the subscriber number is dialed using a dialer on the remote control unit 14 of the workplace.

An embodiment of block 14 of the workplace is given in [8].

The information display unit 15 is intended for visual monitoring of the status (free or busy, accident) of channels and lines, displaying data on the status of subscriber, connecting lines and communication channels, elements of the switching field and the operating mode of the station as a whole. It contains control boards, control circuits for LEDs and relays, circuits for receiving and storing decoded commands coming from the output of the first 7 peripheral control unit of the control device 6, as well as receiving data from the output of unit 4 of the switching field, unit 5 of service devices, unit 14 of the workplace , block 16 channel sets and block 30 software control.

Block 16 channel sets contains sets of long-distance communication channels constructed according to the multi-wire principle and that provide various functions for interacting with channel-forming equipment (blocks 24, 27 and 28), switching equipment (blocks 23 and 25) and block 17 for transit connections, and for operation on an automated long-distance communication channel, block 16 also includes an automation unit that generates the signals "Channel Occupation", "End" and transfer them to the communication channel.

As a block of 16 channel sets, a channel block BK-4 can be used, a block diagram, the capabilities and technical implementation of which are given in [8].

Block 17 transit connections is designed to interconnect the transmission and reception circuits of channels and coordination of signal levels in the formed conversational paths when establishing transit connections via long-distance communication channels.

Block 18 sets of trunk lines (SL) includes (according to the number of lines) sets of trunk lines to the stations of the MB, Central Bank, and ATS systems. The scheme of sets of the Central Bank and the PBX differs from the MB set in the presence of an additional device for connecting the dialer and additional contact sockets for creating a circuit when making a call to the Central Station or the PBX.

The SL kit can be single-sided and double-sided, operating on two-wire, three-wire or four-wire connecting lines. Kits of connecting lines can work both in two-wire and in four-wire modes. Trunk stations are connected to sets of trunk lines in two-wire mode from PBX and Central Bank stations, and in four-wire mode, lines from long-distance telephone exchanges are connected. The transition from four-wire to two-wire mode in the proposed station is provided using block 19 differential systems. When a call signal is received via any connecting line, the call lamp on block 18 lights up and a tone signal is heard in the telephone of the remote control of block 14 of the workplace.

A trunk kit (SL) performs the following functions:

receives an occupation signal from an oncoming station;

provides connection to the register line through its circuit and broadcast pulses to the register;

carries out the sending and control of the call;

receives a response signal from the subscriber and provides power to the subscriber’s microphone;

receives a hang up signal;

transmits a busy signal to the oncoming station if the subscriber is busy.

As block 18, a block of connecting lines of the BSL type can be used, the capabilities of which are given in [8].

Block 19 of differential systems contains differential systems and extension cords that allow the transition from a four-wire path of a communication channel or a four-wire trunk to a two-wire switching path. It is designed to interface switching equipment and control transmission and reception levels when establishing various types of connections.

Block 20 automatic speech-converting devices contains vocoder or lipreder devices, including analog-to-digital and digital-to-analog signal converters, amplifiers and frequency filters, matching elements. It is designed to convert analog signals to digital form during voice transmission and reverse conversion at the reception of digital signals to analog form. Options for signal conversion schemes are given in [9].

The interface unit 21 is designed to convert speech and control signals in order to match the outputs of the unit 20 of automatic speech-converting devices with subscriber sets of block 3 sets of subscriber lines and channel sets of block 16 according to signal levels and call system.

The channel switching unit 23 performs the functions of a channel cross, on which channels are monitored and tested, their parameters are measured, and switching from the main to the backup channel when the main channel fails. As block 23, a BK-2 switching block can be used, a block diagram, the capabilities and technical implementation of which are given in a well-known source [6].

Block 24 is intended for group encryption of information transmitted via long-distance communication channels in order to protect it from interception and hiding the content of transmitted messages. It contains a temporary compaction and decompression unit, a group encoder, a channel distributor, and matching devices.

As block 24, the confidential communication device described in [4] can be used, which contains the analyzer of the speech-transforming device, the pseudo-random sequence generator, the cipher block, the linear block (adder, digital-to-analog converter), and includes a linear unit (low-pass filter, analog-to-digital converter), pseudo-random sequence generator, cipher removal unit, speech-processing device synthesizer, as well as form Bani frequencies.

Block 25 switching digital channels is intended for switching and distribution formed by the block 24 channels, their control and testing, as well as for switching and distribution to consumers of external digital channels 34 received through block 22 input channels. As block 25, a remotely controlled cross-switching device DU-UKK can be used, the circuit and technical capabilities of which are given in [10].

This device is intended for connecting and cordless switching of standard four-wire telephone channels, four-wire voice-frequency cable channels, pulse and digital channels with a transmission speed from 1.2 to 48 Kbps and four-wire station lines.

Block 26 is intended for the exchange of interaction signals between the terminal devices of the telephone exchange when working on long-distance communication channels. It provides an analysis of interaction signals, subscriber numbers and commands for establishing the type of communication, transmitting and receiving signals from a channel, converting received interaction signals to appropriate commands, generating control signals based on the received information and making a call to the subscriber through a block of 16 channel sets and block 4 switching field, and in the direction of the channel through the switching blocks 23, 25 and signal conversion blocks 24, 27 and 28.

Block 26 of the interaction signals contains a translator, a generator and a receiver of interaction signals, an outgoing register, a transceiver that encode, decode, transmit and receive control signals and linear signals via long-distance communication channels. The double-acting translator can include a block of differential systems and extension cords, an outgoing communication unit, an incoming communication unit, a type of communication determinant, an interaction unit, and an alarm unit.

Block 26 of interaction signals can also be made in the form of a device for interfacing hand-held telephone exchanges with automated long-distance telephone exchanges (PBX) via long-distance communication channels described in [5].

The tone frequency (TCH) signal conversion block 27 is designed to provide the station with standard tone frequency channels when transmitting discrete signals using block 24, the input and output signals of which are digital. As such a block, a modem for tonal frequency channels (PM modem) at a transmission speed of 9600 bit / s of the type “Modem-9600” can be used.

Block 28 of individual information encryption is designed to protect against interception of telephone messages and other data transmitted over the communication channel. As such a block, the confidential communication device described in [4] can be used. Block 28, unlike block 24, incorporates an individual encoder instead of a group one.

Block 29 sets of transmission lines is designed to expand the capacity of the station by combining part of the serviced subscribers of the interactive telephone exchanges of operational communications when working on long-distance channels. As the block 29 can be used block UAV, a variant of the circuit implementation of which is given in [8].

Block 30 software control is designed for integrated control of switching equipment, service devices and control devices of the station in order to detect faulty devices and replace them with backup ones. When a malfunction occurs, the control circuit is activated, an optical alarm is turned on, and a malfunction signal is output to the display unit 15. This ensures increased reliability and improved operating conditions of the telephone exchange of operational communications.

The program control unit 30 comprises a call receiver, a dialing circuit, a control command shaper, a control command shaper, a memory unit for storing information about the devices involved in establishing the connection, the device blocking shapers and resetting them to their initial state.

Block 30 software control also includes programs for additional types of customer service, providing functional control over the state of the switching equipment of the station and its control device. Unit 30 receives the necessary information for the implementation of the control program from the RAM unit 10 and the program memory unit 12 of the control device 6, which, depending on the data stored in them, enters the unit 30 through the fourth control inputs and outputs of the third 9 peripheral control unit. The program available in the station, when changing the operating conditions of the station and the need to restructure its operation, can be replaced by another through the above program change unit 13.

The telephone exchange for operational communications provides the following types of connections and operating modes:

1) internal connections via subscriber lines (local network subscribers);

2) outgoing connections via trunk lines (SL) from other stations;

3) incoming trunk connections from other stations;

4) outgoing, incoming and transit connections via long-distance communication channels;

5) encryption mode of information transmitted over long-distance channels;

6) built-in monitoring of the state of switching equipment, service devices and a control device.

The internal connection is made between the subscribers of the local communication network, i.e. between subscribers included in the same station. At the same time, depending on the type of lines and subscriber units used, the connection can be established automatically via subscriber lines connected to the PBX station, and manually with subscribers of stations of the Central Bank and MB systems through the telephone exchange operator by connecting the workstation unit 14 to the indicated lines of the console.

The general procedure for establishing a connection is divided into two stages:

at the first stage, a call is received from a subscriber set or a set of trunk line (SL), finding and connecting the register to them to receive information;

at the second stage, the nature of the connection (internal or external), the employment test of the called subscriber set (AK) or the SL set, the selection and occupation of the cord set and the compilation of the conversation path are determined from the received information.

With an internal connection, the subscriber set receives a call from the subscriber and generates a request signal to the control unit 6, which searches for a free register (Reg) and an intermediate line available for both the subscriber set and the register. After connecting the register, the subscriber receives the signal "Station Response" ("OS") and can dial the number of the called subscriber.

The process of establishing a connection is as follows.

When the caller picks up the handset, the call signal from the telephone through the subscriber line 31, the line input unit 1 and the subscriber cross unit 2 enters the block 3 sets of subscriber lines. In block 3, the subscriber set captures the call and, through the subscriber search step of block 4 of the switching field, takes the marker of the first peripheral control unit 7 to service the connection, transmits information about the number of the calling subscriber to it. The marker identifies this number, searches for a free cord set (HK) and an intermediate line between links A and B, through which the caller can be connected to this cord set. If there is no such free HQ, then the subscriber search marker is released after a certain time, and the subscriber receives a busy signal from his subscriber set. If a free HK is selected, then the AI marker turns on the switching points in links A and B, connecting the subscriber set with the free cord set, and turns it off. A register search marker (RI) is connected to the cord set, which selects a free register, connects it through the RI circuit to the selected cord set, and turns off. The subscriber receives a signal from the register circuit - a station response ("OS"). This concludes the first step in establishing a connection.

The second stage begins with fixing the first digit in the register and requesting the control unit to analyze this digit. If the number corresponds to the index of his station, then the request is canceled and the register records all other digits of the subscriber number. Then, the control unit is again requested and the received number is analyzed, as well as a busy test for the required subscriber set, and if it is free, the cord set that is available and available to him at that moment is searched, and the intermediate line available to the called person is sampled from the selected cord set to the subscriber.

As a result of switching on the switching points, the conversational path is compiled, the register is turned off, a call is sent to the subscriber from the cord set, and call control (CPV) is sent to the caller. The cord kit captures the response and holds the connection until it hangs up.

In this case, the subscriber, upon hearing the "OS" signal, dials the number of the called subscriber, which is fixed by the register. The register after fixing the last digit of the full number through the register finder and cord kit takes a group search marker (MGI) and transmits information about the direction of search into it. Having received this information, the GI marker performs a group search: it determines the required direction and tries the outputs in this direction for employment. If there are free outputs, then the GI marker selects an intermediate line between links A and B, with which the calling input can be connected to the found output, turns on the corresponding switching points of links A and B and turns it off. If there are no free outputs in the required direction or a free and accessible intermediate line between links A and B, the GI marker is disabled and the caller receives a busy signal. Then, along the established path through the GI stage, the register takes the subscriber search marker and transmits information about the number of the called subscriber into it. Based on this information, the subscriber search marker determines the subscriber set into which the line of the called subscriber is included, and if the called subscriber is free, then selects the connection path of this subscriber set with the served input of the link C of the subscriber search circuit. If there is such a path, the subscriber search marker gives the command to turn on the corresponding switching points of the switching field unit 4 to connect the calling subscriber to side A and the called subscriber to side B of the cord set of the service unit block 5 selected for connection. After creating the switching points, the marker is disabled, freeing up the register.

The connection is further serviced from the cord kit, which, through blocks 4, 3, 2, and 1, sends an alternating current call to the called subscriber's line 31, sends the tone “Call Control” (CVC) to the caller’s line along the same path, and receives a signal answer from the called subscriber and puts his circuit into conversational state, provides power to the microphones of the telephone sets of both subscribers, creates in block 4 circuits of keeping two switching points in working condition, with the help of which the calling and calling Vai subscribers switched through via the subscriber stage Hunt unit 4 to the set of corded unit 5 receives a signal and performs disconnection rebound subscribers.

The negotiation path is established along the chain: the subscriber’s subscriber line 31, the line input unit 1, the subscriber cross unit 2, the subscriber line unit 3, the switching field unit 4, the input (side A) and output (side B) of the cord set of unit 5 serving devices and then through blocks 4, 3, 2 and 1 to the subscriber line 31 of the called subscriber. This concludes the second stage of establishing an internal connection.

After the negotiations end, there is a hang up. If in the case under consideration the caller was the first to hang up, then after the line breaks, the activated cord set of unit 5 de-energizes the switching points in the switching field of unit 4 and is released. If the second subscriber has not put the handset on this point, then the busy signal is sent to him from his subscriber set of unit 3.

So the connection between the subscribers of the PBX system.

Connection with the subscriber of the securities system is as follows.

When the handset is removed by the subscriber of the central bank connected to the central bank set of block 3, the call lamp (LP) on block 3, the general call lamp (CFL) lights up, and the acoustic signal on block 15 is turned on.

To interrogate the subscriber, the operator from block 14 of the workstation using spoken devices through the cord set of block 5 of service devices and block 4 of the switching field is connected to the set of central banks on block 3. After polling the subscriber and receiving the order, the station operator selects using the buttons on the remote control of block 14 of the workplace linear sets of required subscribers and by pressing the COMMUNICATION button transmits through the third 9 peripheral unit to the central control unit 11 of the device 6 a command to establish a connection, through which the block 11 forms and transmits 4 provides a flow control signal to the switching field to be connected in subscriber line circuits spoken calling and called subscribers to each other.

The negotiation path is established along the chain: the subscriber’s subscriber line 31, the line input unit 1, the subscriber cross unit 2, the subscriber line unit 3, the switching field unit 4, the input (side A) and output (side B) of the cord set of unit 5 serving devices and then through blocks 4, 3, 2 and 1 to the subscriber line 31 of the called subscriber.

The subscriber of the Central Bank, ending the conversation, puts the handset on the telephone. At the same time, the bump lamp on the set of central banks of the block of 3 sets of subscriber lines lights up and the end signal through the first 7 peripheral control unit enters the central control unit 11, where the corresponding command is generated, and the control signal through block 8 is transmitted to the switching field unit 4, under which the switching points are disconnected and all elements of the station are returned to their original state.

To send a ringtone to a subscriber who has forgotten to put the handset on, you must press the button to make a call (PV) on the remote control unit 14 of the workplace. A call tone sent to the subscriber is heard on the workstation handset.

The establishment of outgoing external communication via trunk lines to the oncoming exchange of a telephone exchange also occurs in two stages.

With outgoing external communication, the connection of the caller line to the register is carried out in the same way as with the internal connection. At the second stage of the connection, the register, having fixed the dialed number, transmits to the group search marker a digit (or digits) defining the direction of the external connection. The group search marker determines the desired direction of search and selects one of the free connecting lines in this direction, then selects the switching points on links A and B and the intermediate line between them, includes the switching points, thereby connecting the cord set to the connecting line set of the desired direction. Further, the GI marker transmits a signal to the register on the order of its subsequent operation.

If the oncoming station is of the same type, then there are two possible transmission options, depending on the type of sets of connecting lines used. According to the first option, the transmission of the number does not differ from the previously considered method of interaction with the exchange of other systems with the disconnection of its register. According to the second option, the register fixes the entire number, including the numbers related to establishing a connection at the oncoming station, and after receiving a signal from it, transmits information about the number with a high-speed code via the trunk directly to the group and subscriber search markers of the oncoming exchange.

With incoming external communication, a set of SLs is engaged. Further, if the interaction is carried out according to the first option, then the register search marker connects the register to the set, which receives subsequent information about the number from the subscriber of the outgoing exchange.

During the interaction of the same type of automatic telephone exchange according to the second variant, the occupation signal from the SL set goes directly to the GI marker. The register of the outgoing telephone exchange, having received the signal for connecting the group search marker, issues the corresponding parts of the number first to the GI marker, and then to the subscriber search marker of the incoming PBX. The further procedure for establishing a connection is similar for the internal connection discussed above, with the only difference being that the functions of the cord set at the incoming station are performed by a set of connecting line or channel set.

Hang up at the station is one-way - from any subscriber. With any kind of connection, the end signal is perceived by the cord kit (connecting line kit or channel kit), which opens the holding circuits of the electromagnets of the switching points in the search stages, and the connection is destroyed. All devices of the station are returned to their original state.

The procedure for establishing connections over long-distance channels is as follows.

Outgoing automatic connection via long-distance communication channel.

When the caller picks up the handset, his line is switched off through the subscriber search stage to a free cord set, with which a register is connected to the subscriber line. The subscriber dials the number of the desired station. Under the control of the marker, the group search stage ensures the subscriber line is connected to the translator of a free long-distance channel in the desired direction. When the oncoming station answers (second ready signal), the subscriber dials the subscriber number, which is transmitted through the translator to the devices of the incoming oncoming station.

Incoming automatic connection.

The occupation signal from the channel goes to the translator, to which the register is connected through the register finder. The caller is sent a station ready signal for dialing. The first two digits of the dialed number are accepted by the register. The first digit determines the need to establish a terminal connection, and the second - the number of the switching unit of the subscriber search stage, which includes the called subscriber. Through the group search step, the output of the translator is switched to a free cord kit. The subscriber search stage register is connected to the busy HQ, which receives through the translator information about the number of the called subscriber (the last two digits). Further, the AI marker, through the subscriber search switching circuit, connects the cord kit to the subscriber kit of the called subscriber. When the called subscriber answers, the translator of the incoming station and the translator of the outgoing station are set to talk.

When establishing an outgoing semi-automatic connection, the operator using the remote control unit 14 of the workplace is connected to the channel set of unit 16 and tests for the occupancy of the channel, which includes the called party at the oncoming station. If the channel is free, the operator dials the called number. The dialing pulses are received by block 16 and transmitted by block 26 through blocks 25, 24, 23, 27 and 22 to the tone frequency channel 33 and then the signals are sent through the channel to the oncoming station where the incoming connection via the long-distance communication channel takes place.

Incoming semi-automatic connection via long-distance communication channel.

When an incoming connection is established, the signals from channel 33 through blocks 22, 23, 27, 24 and 25 are sent to block 26 of the interaction signals. In block 26, when the translator is busy with the incoming connection from the receiver of interaction signals, the signal "Occupation" is received, the block occupies the group search stage register, from which the signal "Station response" is sent to the channel. At the same time, through the alarm unit, the compiler is blocked from other activities. The dialing pulses from the receiver go to the group search register. When the translator is switched off through the switching field of the group search stage, the spoken wires of the translator are switched off in accordance with the type of connection and the subscriber line conductivity. Hang up is similar to hang up on an outgoing connection.

With an incoming semi-automatic connection, the call from the communication channel is fixed on the channel set directly assigned to this channel. In addition, the PR lamp lights up. CHALLENGE on the block 26 of the interaction signals, if the channel is enabled through the specified block. The operator connects to the channel using the remote control unit 14 of the workplace, polls the subscriber and, having received the order (number of the called subscriber), transmits information about the number of the called subscriber to the register of block 5 of the service devices. Next, the connection is established in the same way as with the internal connection of subscribers.

Disconnection (release) during semi-automatic connections occurs in the usual way without operator intervention. The “Hang up” signal is transmitted to the channel and received from the communication channel automatically using the automation unit of the channel sets block.

The transit connection in the station is between the long-distance communication channels in automatic and manual modes.

Transit automatic connection.

In transit connections, two translators of a block of 16 channel sets work. The incoming translator (the translator to which the call was received on the channel) works the same way as with an incoming connection. When the register receives a number defining a transit connection, the group search marker connects through the switching circuit of block 4 of the switching field block 5 and block 17 of transit connections the output of the incoming translator with the input of the outgoing translator of the free channel of the desired direction. When the incoming translator is connected to the outgoing one through a differential system and extension cords of the transit connection block 17, a four-wire transit circuit is formed. In the future, both translators work as with regular incoming and outgoing connections. Moreover, all control signals and linear signals, except for hang-up signals, pass through the transit station without affecting its devices.

The establishment of a transit connection via long-distance communication channels in manual mode is carried out by the station operator using the remote control unit 14 of the workplace. Reception of a call signal, interrogation and connection of subscribers of the calling and called channels occur in the same way as with the semi-automatic incoming and outgoing channel connections. The only difference is that the called and calling channels are connected through the block of transit connections 17, in which the differential system and extension cords are included in the connected conversational circuits to match the signal levels of the transmission and reception channels of the channels. Fulfilling the order, the station operator connects to the channel translator, through which the call-order was received, dials the number towards the called subscriber and connects it to the channel through the group and subscriber search steps.

For operation of the station via digital communication channels, a block 20 of automatic speech-converting devices (ARPU) and a pairing unit 21 are introduced into its composition. At the same time, in the negotiating tract, compiled in accordance with the considered modes of operation via communication channels, in the section between the subscriber and cord sets, an automatic speech-converting device is turned on, which converts the analog signals into discrete ones by matching them using the pairing unit 21 and issuing digital signals through blocks 5, 16, 26, 25 and 22 to the input of an external 34 digital channel. At the reception, the digital signals coming from the output of the external 34 channel, through blocks 22, 25, 26, 16, 5, and 21, are transmitted to the input of the ARPU of block 20, which converts them into analog signals and through the cord set of block 5 of service devices and block 4 of switching the fields are transmitted to the input of the subscriber set of block 3, and then they pass through the block 2 of the subscriber cross, block 1 input lines and subscriber line 31 are received at the input of the telephone set of the subscriber.

The encryption mode of information transmitted over long-distance communication channels is carried out by including blocks 24 and 28 in the compiled negotiation path. At the same time, the encrypted information (when using the block 24 of group encryption of information) from the output of the tone frequency channel 33 enters through the blocks 22 and 23 to the third (analog input) of the block 27, is converted into a discrete form in it and from the fourth (discrete) output goes to one from the channel inputs of block 24, in which the cipher is removed. The decrypted information from the output of one of the channels of block 24 goes through blocks 25 and 26 to the channel set of block 16, in which ringing signals are received and control signals are generated. Further, the information in discrete form from the output of block 16 through blocks 5 and 21 is fed to the input of block 20 of automatic speech-converting devices, with which the station operator negotiates with the subscriber of the oncoming channel through a channel.

When using the individual encryption unit 28, it is included in the tone frequency channel 33 between the channel set unit 16 and the channel switching unit 23 through the channel input unit 22. The negotiating path goes along the following path: the tone frequency channel 33 is transmitted through blocks 22 and 23 to the first input and output of the individual information encryption block 28, the second input and output of which is connected to the channel set of block 16 assigned to this block, and then the path passes through block 5 to block 4 of the switching field.

Telephone communication via external digital channels using the individual information encryption unit 28 is carried out according to the following path: external digital channel 34, second input and output of channel input unit 22, third input and output of digital channel switching unit 25, additional input and output of switching unit 25 digital channels, additional discrete input and output of block 28 for individual encryption of information, the second input and output of block 28, channel set of block 16 channel sets (through the fifth input and output), fourth input the output of the unit 16. Further, the information in discrete form from the fourth input and output of the unit 16 through the third input and output of the unit 5 serving devices, the first input and output of the unit 21 of the pair is fed to the second (discrete) input and output of the unit 20 of automatic speech-converting devices, using which the station operator is negotiating on the channel with the oncoming station subscriber.

The station provides for the establishment of connections with subscribers via transmission lines connected to a similar interacting station, with the provision of the types and operating modes discussed above for long-distance communication channels.

At the same time, communication channels from a similar interacting station via transmission lines 35 through channel input unit 22 and transmission line sets unit 29 are connected to certain channel sets of unit 16 and can be used in the interests of subscribers of this station to provide communication on these channels. This helps to increase the capacity of the proposed station and expand the scope of its services.

The built-in control in the station is carried out continuously both during the connection establishment processes and before it in the initial period of time. At the same time, a real-time check of the station’s operability, control of the technical condition of the switching equipment, service devices and control device is carried out. Faulty devices identified by the results of the control are automatically replaced by working ones. This proposed telephone exchange operational communication differs significantly from the prototype.

The technical efficiency of the proposed telephone exchange of operational communications is to improve the quality of customer service and increase the efficiency of communication, achieved through the implementation of the station’s built-in monitoring system of switching equipment, service devices and control devices and the possibility of restructuring the work of the station in accordance with changing operating conditions. This solution helps to reduce unproductive time spent on troubleshooting and troubleshooting during operation of the station, on repeated attempts to connect to busy or faulty devices of the station and, accordingly, reducing the load on the switching equipment and service devices, which made it possible to increase the efficiency of establishing connections and connections provided telephone station.

The calculations and tests of the layout showed that in the proposed station, in comparison with the prototype, the average connection setup time was reduced from 10 to 5 s and from 50 to 30 s with automatic and manual customer service, respectively. It follows that the efficiency of communication in the station is higher than that of the prototype.

The introduction of additional communication between the digital channel switching unit 25 and the individual information encryption unit 28 is provided in the proposed station, unlike the prototype, the simultaneous maintenance of the telephone communication information using the individual encryption unit 28 not only via the tonal frequency channel, but also via external digital channels. This helps to expand the functionality of the proposed telephone exchange and, accordingly, improve the quality of customer service.

In addition, in the proposed station, due to the implementation of functional monitoring and automatic diagnostics by software methods of the state of the switching equipment and its control devices, automatic search and replacement of failed devices, maintenance of the station’s operability, which reduces the station’s failures, helps to expand the service sector , the emergence of additional types of services and improving the quality of customer service.

Sources of information

1. Copyright certificate SU No. 572942, cl. H 04 M 3/00, 1977.

2. US patent No. 4016372, cl. H 04 M 1/72, NKI 179-99, 1977.

3. Patent RU No. 2187903, cl. H 04 M 5/00, 2002.

4. Patent RU No. 2117401, cl. H 04 K 1/00, 1998.

5. Copyright certificate SU No. 482920, cl. H 04 Q 3/04, 1975.

6. Technical description and operating instructions for the switching unit BK-2 TsG 2.148.026 TO, 1984.

7. Technical description and instruction manual for the block of subscriber cross 2.106.245 TO, 1984.

8. Military switching systems and telephony. B.A. Gordienko, V.N. Filippov, L.P. Shcherbina. / Ed. B.A. Gordienko - YOU, 1984.

9. Jansen J. Digital Electronics Course: In 4 vols. T.3. Sophisticated ICs for a data device. Per. with goll. - M.: Mir, 1987.

10. Technical description DU-UKK. XY1. 220.100 TO, 1982.

Claims (1)

A hotline telephone exchange comprising a line input unit, the inputs and outputs of which are connected to the first inputs and outputs of a subscriber cross unit, the second inputs and outputs of which are connected to the first inputs and outputs of a subscriber line set block, the second inputs and outputs of which include voice and call circuits of each subscriber set are connected to the first inputs and outputs of the switching field unit, the second inputs and outputs of which are connected to the first inputs and outputs of the unit of servicing devices, the second inputs and outputs of which connected to the first inputs and outputs of the workstation unit, the information display unit, the channel sets unit, the first inputs and outputs of which are connected to the inputs and outputs of the transit connection unit, the third inputs and outputs of the switching field unit are connected to the third inputs and outputs of the channel sets unit, the fourth inputs and outputs of the switching field unit are connected to the first inputs and outputs of the block of sets of connecting lines, and the fifth inputs and outputs of the switching field block are connected to the first inputs and outputs of the diff block of potential systems, the second inputs and outputs of which are connected to the second inputs and outputs of the block of sets of connecting lines, the third inputs and outputs of which are connected to the third inputs and outputs of the subscriber cross unit, to which the subscriber and connecting lines are connected through the line input block, and the third inputs and outputs the block of serving devices are connected to the fourth inputs and outputs of the block of channel sets, the fourth inputs and outputs of the block of serving devices are connected to the first inputs and outputs of the block of automatic speech reproduction developing devices, the second inputs and outputs of which are connected to the first inputs and outputs of the interface unit, the second inputs and outputs of which are connected to the fifth inputs and outputs of the service unit, the signal outputs of the switching field unit are connected to the first inputs of the information display unit, to the second and third inputs which signal outputs are connected, respectively, of the workstation block and channel sets block, the channel input block with tonal frequency channels connected to it, whose first inputs and outputs are connected are not connected with the first inputs and outputs of the channel switching unit, the second inputs and outputs of which are connected to the first inputs and outputs of the group encryption unit of information, the second inputs and outputs of which are connected to the first inputs and outputs of the digital channel switching unit, the second inputs and outputs of which are connected to the first inputs and outputs of the interaction signal block, the second inputs and outputs of which are connected to the second inputs and outputs of the channel sets block, the third inputs and outputs of the channel switching unit are connected to analog inputs and outputs a tone frequency signal conversion unit, the discrete inputs and outputs of which are connected to the fourth inputs and outputs of the channel switching unit, the fifth inputs and outputs of which are connected to the fifth inputs and outputs of the channel sets block through the individual information encryption unit, the sixth inputs and outputs of which are connected to the first inputs - the outputs of the block of sets of transfer lines, to the second inputs and outputs of which through the third inputs and outputs of the channel input unit are connected transfer lines, while the channels of tone frequency Through the channel input unit, the first and third inputs and outputs of the channel switching unit are connected to the analog inputs and outputs of the tone frequency signal conversion unit, and the external digital channel inputs and outputs are connected to the third inputs and outputs of the digital channel switching unit , characterized in that it introduced a program control unit and a specialized control device that provides the ability to restructure the station in accordance with changing operating conditions and increasing the speed of its operation, consisting of the first, second and third peripheral control units, operative memory unit, central control unit, software storage unit and program change unit, the output of the first peripheral control unit being connected to the input of the operative memory unit, information inputs are the outputs of which are connected to the first information inputs and outputs of the central control unit, the first, second and third control inputs and outputs of which are connected to the first control inputs to the odes-outputs of the first, second and third peripheral control units, the second and third information inputs and outputs of the central control unit are connected to the first information inputs and outputs of the software storage unit and the program change unit, the second information inputs and outputs of which are connected to the second information inputs - the outputs of the software storage unit, and the second, third, fourth, fifth and sixth control inputs and outputs of the first peripheral control unit are connected s to the control inputs and outputs of the subscriber line sets block, the information display block, the channel sets block, the connecting line sets block and the transmission line sets block, the second control inputs and outputs of the second peripheral control unit are connected to the control inputs and outputs of the switching field unit, and the second, third and fourth control inputs and outputs of the third peripheral control unit are connected to the control inputs and outputs of the unit serving the device c, a workstation unit and a program control unit, the first and second information inputs and outputs of which are connected to additional information inputs and outputs of a switching field unit and a unit of service devices, an additional signal output of which is connected to the first additional input of the information display unit, the second additional input which is connected to the signal output of the program control unit, and the additional inputs and outputs of the switching unit of digital channels are connected to effective discrete inputs and outputs of the individual information encryption unit.