RU2250571C2 - Digital switching system - Google Patents

Abstract

FIELD: telephone communications.

SUBSTANCE: novelty is introduction of switching hardware complexes and subscriber concentration modules in digital switching system; introduced in transit switching module are terminal station sets, group connection units, central processor, control channel matching unit, fully accessible jackfield, and synchronizing system; each group connection unit has in addition first sync signal receiver, second call processing unit, first synchronization switching unit, control channel unit, and central control channel shaping unit.

EFFECT: enlarged functional capabilities and enhanced capacity of digital switching system.

4 cl, 5 dwg

Description

The invention relates to communication technology, in particular to the construction of digital switching telephone systems.

Based on the prior art, it can be concluded that many technical solutions are aimed at expanding the functionality and increasing the capacity of digital switching systems, but the level of these indicators is not high enough (see Telenokia. Technical documentation for the DH-200 system, Finland; author. certificate of the USSR No. 1737749, 1992, MKI N 04 M 3/00; pat. of the Russian Federation No. 2119263 dated 05/23/97, MKI N 04 M 3/00).

The prototype of the claimed system is a digital switching system (see AS USSR No. 1547671, publ. 07.09.91, MKI N 04 M 3/00) containing a transit switching module, l subscriber concentration modules, l · m · n telephone sets , the transit switching module contains l · k first and p second terminal station sets and a group connection unit containing the first multi-frequency signaling unit, a linear signaling unit connected to the first control bus, the first marker and the first block of the common signaling channel, the signal output of which connected to the first inputs l · k of the first terminal station sets, the first inputs and outputs of which are the first l · k inputs and outputs of the transit switching module, the first inputs and outputs of the second terminal station sets are the second p inputs and outputs of the transit switching module and the system In general, each subscriber concentration module contains k third terminal station sets, an interaction signal generator, a second common signaling channel unit, an interaction signal connection unit, a first sampler call bots and a subscriber kit containing a subscriber activity determination unit and a subscriber signaling receiver, the first input-output of the first call processing unit via the second control bus is connected to the first input-output of the interaction signal connection unit, the output of the latter is connected to the control input of the second block of the common signaling channel the first output of which is connected to the first inputs of the k third terminal station sets, the first k inputs and outputs of which are the first k inputs and outputs of the abone module tskoy concentration, connected to respective first inputs-outputs k transit switching module, the second k inputs and outputs of third terminal station sets connected to respective second input-output connection unit signals the interaction with the signal input of which is connected to the signal generator output interaction. In addition, the system contains l · m remote subscriber modules. The system uses specially designed telephones, each of which is connected through a remote subscriber module to the corresponding input / output of the subscriber concentration module.

A disadvantage of the known technical solution is the limited functionality due to the fact that the digital switching system is implemented as an electronic automatic station that works only with digital telephones (EATS-CA) of the S-32 system, and for working with existing public telephone networks with standardized equipment requires installation of additional matching devices by the user. In addition, the transit switching module and the subscriber concentration module are made for a specific size digital switching system, which does not allow expanding the system capacity by connecting various telephone sets or switching equipment complexes, for example, other automatic telephone exchanges.

The basis of the invention is the task of improving the digital switching system, in which due to the new implementation of the subscriber set, the terminal station set, as well as the subscriber concentration module and the transit switching module, the system is expanded with the functionality of connecting various complexes of switching equipment.

To solve the problem in a well-known digital switching system containing a transit switching module, l subscriber concentration modules, l · m · n telephone sets, a transit switching module contains l · k first and p second terminal station sets and a group connection unit containing the first block multi-frequency signaling, a linear signaling unit connected to the first control bus, the first marker and the first block of the common signaling channel, the signal output of which is connected to the first inputs l · k first ok terminal station sets, the first inputs and outputs of which are the first l · k inputs and outputs of the transit switching module, the first inputs and outputs of the second terminal station sets are the second p inputs and outputs of the transit switching module and the system as a whole, each subscriber concentration module contains k third terminal station sets, an interaction signal generator, a second common signaling channel unit, an interaction signal connection unit, a first call processing unit and a subscriber set, the holding subscriber activity determination unit and the subscriber signaling receiver, the first input-output of the first call processing unit via the second control bus is connected to the first input-output of the interaction signal connection unit, the output of the latter is connected to the control input of the second unit of the common signaling channel, the first output of which is connected to the first inputs of k third terminal station sets, the first k inputs and outputs of which are the first k inputs and outputs of the subscriber concentration module, connected to with the corresponding first k inputs and outputs of the transit switching module, the second k inputs and outputs of the third terminal station sets are connected to the corresponding second inputs and outputs of the interaction signal connection unit, the signal input of which is connected to the output of the interaction signal generator, according to the invention, s · l · q complexes of switching equipment and l · (q-1) modules of subscriber concentration, l · v of the first terminal station sets, q-1 blocks of group connected and connected to the third control bus of the first I / O, the central processor, the control channel matching unit, the fully accessible switching field and the synchronization system, each group connection unit further comprises a first synchronization signal receiver connected to the first control bus through the first inputs and outputs, the second unit call processing, the first synchronization switching unit, the control channel unit and the central control channel former, the output of which is connected with control inputs of the first multi-frequency signaling unit, linear signaling unit and common signaling channel unit, and the second and third inputs / outputs are connected to the second inputs / outputs respectively l · (k + v) of the first and p second terminal station sets, the second input-output the block of control channels is connected to one of the q inputs and outputs of the block matching the control channels, the outputs l · (k + v) of the first and p second terminal station sets are connected to the corresponding inputs of the first receiver of synchronization signals, output which is connected to one of the q inputs of the synchronization system, one of q outputs of which is connected to the input of the first synchronization switching unit, the outputs of the latter are connected to the corresponding fourth inputs l · (k + v) of the first and p second terminal station sets, the third inputs and outputs of which connected to the corresponding inputs and outputs of the second call processing unit, the switching input-output of which is connected to the corresponding input-output of a fully accessible switching field, the signal output of the first block of the common channel s channelization is connected to the first inputs p of the second terminal station sets, and the signal outputs of the first linear signaling unit and the multi-frequency signaling unit, respectively, to the second and third inputs l · (k + v) of the first and p second terminal station sets, each subscriber concentration module further comprises m-1 subscriber sets, v third and s fourth terminal station sets, a second linear signaling unit, a second multi-frequency signaling unit, a seal-decompression unit and are connected to the second control bus, a second synchronization signal receiver, a synchronization switching unit and a marker, each subscriber set additionally contains n first matching units, a signal conversion unit, a third synchronization signal receiver and a control signal generating device and a first processor, switch and shaper connected to the fourth control bus control channels, each of [l · (k + v) + p + s + k + v] · q terminal station sets contains a second matching unit, a synchronization transceiver, bl information reception and transmission, a linear signal conditioning unit, a signal processor, a serial-parallel converter, a second processor, a control channel former and a switch, a fifth and sixth control bus connected to each other via a matching device, the first inputs are connected to the fifth control bus the outputs of the information reception and transmission unit, the linear signaling generation unit, the second switch, the processor and the control channel former, the first inputs are connected to the sixth control bus dy-outputs of the signal processor and the serial-parallel converter, the second input-output of which is connected to the second input-output of the information reception and transmission unit, the third and fourth inputs and outputs of which are connected respectively to the second inputs and outputs of the second switch and the linear signaling generation unit, and the fifth input-output is connected to the first input-output of the second matching unit, the second input-output of which is the first input-output of the terminal station set, the second input-output of which I the second input-output of the second driver of the control channels is input, and the first and second outputs are, respectively, the first output of the information reception and transmission unit and the output of the synchronization transceiver, to the input of which the second output of the information reception and transmission unit, the first, second and third inputs of the terminal station set are connected connected to the corresponding inputs of the second switch and the fourth input to the synchronization inputs of the block of reception and transmission of information, serial-parallel converter, signal a processor, a linear signal generation unit and a second processor, the third input-output of the terminal station set is connected to the third input-output of the second switch, in each subscriber set, the first and second inputs are connected respectively to the first input of the first switch and the input of the third synchronization signal receiver, the output of which connected to the synchronizing inputs of the subscriber signaling receiver, the device for generating control signals and the first switch, processor and channel former in the control, the second input-output of which is the first input-output of the subscriber set, the second input-output of which is the second input-output of the first switch, the third input-output of the latter is connected to the second input-output of the control signal generation device, the third input-output of which connected to the second input-output of the first processor, the fourth input-output of the first switch through serially connected subscriber signaling receiver, signal conversion unit and subscriber activity determination unit entrances connected to the first inputs and outputs of the n first matching units, the second inputs and outputs of which are n third inputs and outputs of the subscriber set, which are connected to the corresponding telephone sets, in each subscriber concentration module, the second and third inputs and outputs are connected respectively to the first inputs - outputs s of the fourth terminal station sets and m subscriber sets, the second inputs and outputs of which are connected respectively to the third and fourth inputs and outputs of the unit for connecting signals action, the output of which is connected to the control inputs of the second linear signaling unit and multi-frequency signaling unit, the first outputs of which are connected respectively to the second and third inputs k + v of the third terminal station sets, and the second outputs are connected respectively to the second and third inputs s of the fourth terminal station sets , the third output of the second block of multi-frequency signaling is connected to the first inputs m of the subscriber sets, the second output of the second block of the common synchronization channel is connected to the first inputs s of the fourth terminal station sets, the first, second and third outputs of the second synchronization switching unit are connected respectively to the second inputs m of the subscriber sets and the fourth inputs k + v of the third and s fourth terminal station sets, the outputs of the mentioned terminal station sets are connected respectively to the first and the second inputs of the second receiver of the synchronization signals, the second input-output of the first call processing unit is connected to the first input-output of the seal-decompression unit, the second, third and fourth inputs and outputs of which are connected respectively with the third inputs and outputs of m subscriber sets and the third inputs and outputs k + v of the third and s fourth terminal station sets, each set of switching equipment is connected to the second input and output of the corresponding subscriber concentration module.

The set of switching equipment according to the invention can be made, for example, in the form of an automatic telephone exchange, or ISDN terminal, or in the form of a computer network.

The set of essential features of the proposed technical solution allows you to expand the functionality of the system by creating a digital switching system in the form of a universal complex of software and hardware with a distributed control system due to the new implementation of the subscriber set with the introduction of the processor, as well as the terminal station set, subscriber concentration module and transit switching module. Such a construction structure ensures the system works with any standardized telephone sets and switching equipment complexes, which allows creating systems of any capacities and for any purpose - from the end telephone exchange to the telephone-transit telephone exchange or digital switching systems with any ratio of the capacity and functional purpose of telephone exchanges, which are included in them.

The drawings show the structural diagrams of a digital switching system: in Fig.1 - the system as a whole; figure 2 - module subscriber concentration; figure 3 - module transit switching; in Fig 4. - subscriber set; figure 5 - terminal station set.

The digital switching system contains a module l transit switching, l modules 2 subscriber concentration, lmn telephone sets 3. Module 1 transit switching contains l · k first and p second terminal station sets 4 and block 5 group connection containing the first block 6 multi-frequency signaling, block 7 linear signaling, the signal output of which is connected to the first inputs l · k of the first terminal station sets 4, the first inputs and outputs of which are the first l · k inputs and outputs of the transit switching module 1. The first inputs and outputs p of the second terminal station sets 4 are second p inputs and outputs of the transit switching module 1 and the system as a whole. Each subscriber concentration module 2 contains k third terminal station kits 4, an interaction signal generator 11, a second common signaling channel unit 12, an interaction signal connection unit 13, a first call processing unit 14 and a subscriber set 15 containing a subscriber activity determination unit 16 and a receiver 17 subscriber signaling. The first input-output of the first call processing unit 14 through the second control bus 18 is connected to the first input-output of the interaction signal connection unit 13, the output of the latter is connected to the control input of the second block 12 of the common signaling channel, the first output of which is connected to the first inputs k of the third terminal station sets 4, the first k inputs and outputs of which are the first k inputs and outputs of the subscriber concentration module 2, connected to the corresponding first k inputs and outputs of the transit switching module 1. The second k inputs and outputs of the third terminal station sets 4 are connected to the corresponding second inputs and outputs of the interaction signal connection unit 13, with the signal input of which the output of the interaction signal generator 11 is connected. The system introduced s · l · q complexes of 19 switching equipment and l · (q-1) modules 2 of subscriber concentration. The l · v of the first terminal station sets, q-1 group connection blocks 5 and the central processor 21, the control channel matching unit 22, the fully accessible switching field 23 and the synchronization system 24 are introduced into the transit switching module 1 l · v of the first terminal station sets, q-1 . Each group connection unit 5 further comprises, connected to the first control bus 8, through the first inputs / outputs, a first synchronization signal receiver 25, a second call processing unit 26, a first synchronization switching unit 27, a control channel unit 28, and a central control channel former 29, the output of which is connected with the control inputs of the first multi-frequency signaling unit 6, the linear signaling unit 7 and the common signaling channel unit 10, and the second and third inputs / outputs are connected to the second input-outputs s respectively l · (k + v) first and p second terminal station 4. Second sets of input-output unit 28 control channel is connected to one of the q outputs block-matching inputs 22 of the control channels. The outputs l · (k + v) of the first and p second terminal station sets 4 are connected to the corresponding inputs of the first receiver 25 synchronization signals, the output of which is connected to one of the q inputs of the system 24 synchronization, one of the q outputs of which is connected to the input of the first switching unit 27 synchronization, the outputs of the latter are connected to the corresponding fourth inputs l · (k + v) of the first and p second terminal station sets 4, the third inputs and outputs of which are connected to the corresponding inputs and outputs of the second call processing unit 26, switching the input-output of which is connected to the corresponding input-output of a fully accessible switching field 23. The signal output of the first block 10 of the common signaling channel is connected to the first inputs p of the second terminal station sets 4, and the signal outputs of the first block 7 linear signaling and block 6 multi-frequency signaling, respectively to the second and third inputs l · (k + v) of the first and p second terminal station sets 4. Each subscriber concentration module 2 additionally contains m-1 subscriber sets 15, v third and s of the fourth terminal station sets 4, the second linear signaling unit 30, the second multi-frequency signaling unit 31, the seal-decompression unit 32 and the second synchronization signal receiver 33, the synchronization switching unit 34 and the marker 35 connected to the second control bus 18. Each subscriber set 15 is additionally contains n first blocks 36 matching, block 37 signal conversion, the third receiver 38 of the synchronization signals and connected to the fourth bus 39 of the control device 40 of the formation of control signals and First processor 41, switch 42 and driver 43 control channels. Each of the [l · (k + v) + p + s + k + v] · q terminal station sets 4 contains a second matching unit 44, a synchronization transceiver 45, an information transmitting and receiving unit 46, a linear signaling generating unit 47, a signal processor 48, a serial-parallel converter 49, a second processor 50, a control channel driver 51 and a switch 52, a fifth and a sixth control bus 53 and 54 connected to each other via a matching device 55. The first inputs / outputs of the block 46 are connected to the fifth control bus 53 receiving and transmitting information, block 47 forming a linear signal, the second switch 52, CPU 50 and the driver 51 control channels. The sixth control bus 54 is connected to the first inputs and outputs of the signal processor 48 and the serial-parallel converter 49, the second input-output of which is connected to the second input-output of the information reception and transmission unit 46, the third and fourth inputs and outputs of which are connected respectively to the second inputs the outputs of the second switch 52 and the line signal generation unit 47, and the fifth input-output is connected to the first input-output of the second matching unit 44, the second input-output of which is the first input-output of the terminal station set 4, the second input-output of which is the second input-output of the second driver 51 of the control channels, and the first and second output are, respectively, the first output of the information reception and transmission unit 46 and the output of the synchronization transceiver 45, to the input of which the second output of the reception unit 46 is connected -transmission of information. The first, second and third inputs of the terminal station set 4 are connected to the corresponding inputs of the second switch 52 and the fourth input is connected to the synchronization inputs of the information transmitting and receiving unit 46, the serial-parallel converter 49, the signal processor 48, the linear signaling unit 47 and the second processor 50 The third input-output of the terminal station set 4 is connected to the third input-output of the second switch 52. In each subscriber set 15, the first and second inputs are connected respectively to the first input of the first switch 42 and the input of the third synchronization signal receiver 38, the output of which is connected to the synchronizing inputs of the subscriber signal receiver 17, the control signal generation device 40 and the first switch 42, the processor 41 and the control channel driver 43, the second input-output of which is the first input the output of the subscriber set 15, the second input-output of which is the second input-output of the first switch 42, the third input-output of the latter is connected to the second input-output of the device 40 the formation of control signals, the third input-output of which is connected to the second input-output of the first processor 41. The fourth input-output of the first switch 42 is connected through a series-connected subscriber signal receiver 17, a signal conversion unit 37 and a subscriber activity determination unit 16 to the first input-outputs n first matching blocks 35, the second inputs and outputs of which are n third inputs and outputs of the subscriber set 15, which are connected to the corresponding telephone sets 3. In each module 2 of subscriber concentration, the second and third inputs and outputs are connected respectively to the first inputs and outputs s of the fourth terminal station sets 4 and m of the subscriber sets 15, the second inputs and outputs of which are connected respectively to the third and fourth inputs and outputs of the interaction signal connection unit 13, the output of which is connected with the control inputs of the second linear signaling unit 30 and the multi-frequency signaling unit 31, the first outputs of which are connected respectively to the second and third inputs k + v of the third terminal station sets 4, and the second outputs are connected respectively to the second and third inputs s of the fourth terminal station sets 4. The third output of the second multi-frequency signaling unit 31 is connected to the first inputs m of the subscriber sets 15. The second output of the second block 12 of the common signaling channel is connected to the first inputs s the fourth terminal station sets 4. The first, second and third outputs of the second synchronization switching unit 34 are connected respectively to the second inputs m of the subscriber sets 15 and the fourth inputs mi k + v of the third and s fourth terminal station sets 4, the outputs of said terminal station sets 4 are connected respectively to the first and second inputs of the second receiver 33 of the synchronization signals. The second input-output of the first call processing unit 14 is connected to the first input-output of the seal-decompression unit 32, the second, third, and fourth inputs and outputs of which are connected respectively with the third inputs and outputs of the m subscriber sets 15 and the third inputs and outputs k + v of the third and s of the fourth terminal station sets 4. Each set 19 of switching equipment is connected to the second input-output of the corresponding module 2 subscriber concentration.

The set 19 of switching equipment can be performed, for example, in the form of an automatic telephone exchange, or ISDN terminal, or in the form of a computer network.

In addition, the digital switching system contains communication lines 56 with telephone sets 3, communication lines 57 with complexes 19 of switching equipment using standard telephony protocols, communication lines 58 between the first inputs and outputs of the subscriber concentration module 2 and the transit switching module 1 using the intra-system protocol (hereinafter communication lines 56, 57, 58).

The inventive system is implemented as a digital switching system "East".

The digital switching system is built on a modular basis, has a distributed control system and operates as follows.

Requests for servicing calls (see Figs. 1, 2) from telephone sets 3 or complexes 19 of switching equipment are received respectively at m third and s second inputs and outputs of each subscriber concentration module 2, which are the first inputs and outputs of the subscriber set 15 and fourth terminal station set 4. Processing of incoming / outgoing calls in the subscriber set 15 and in the terminal station set 4 is described below.

The subscriber concentration module 2 receives the signal and processes it in accordance with the programs stored in its memory, and generates a message that transmits from the first input-output to the first input-output of the transit switching module 1, namely, the corresponding group connection unit 5. The latter performs preliminary processing of the message and generates a corresponding request, which transmits to the central processor 21, which determines the necessary sequence of actions, generates commands and, through the first inputs and outputs of the transit switching module 1, transfers them to the first inputs and outputs of the subscriber concentration module 2, which, in accordance with with the received commands, it connects the necessary blocks for issuing the corresponding control and information signals (station and acoustic signals, number information ments, etc.) and the conclusion of the conversational tract. To the subscriber concentration module 2, both telephone sets 3 and other complexes 19 of switching equipment can be connected in any ratio, which allows it to be used both for communication with subscribers and for transit switching.

A. An incoming call coming from the complexes 19 of the switching equipment or / and from the telephone sets 3 to the second and third inputs and outputs of the subscriber concentration module 2, respectively, is processed as follows (see FIG. 2).

The signaling information coming from the subscriber set 15 or the fourth terminal station set 4 through the interaction signal connection unit 13, and the conversational information coming through the compression-decompression unit 32 and the first call processing unit 14 are sent via the second control bus 18 to the second marker 35, where processed according to the programs located in its read-only memory (hereinafter, ROM, not shown in the drawing).

According to the information received and the data in the ROM, the second marker 35 determines to which complex 19 of the switching equipment or to which subscriber concentration module 2 the called subscriber is connected. If the called subscriber is not a subscriber whose telephone set 3 is directly connected via the communication line 56 of this subscriber concentration module 2, then according to the information of the random access memory (hereinafter referred to as RAM, not shown in the drawing) of the second marker 35, the latter finds a free communication line 58 of the first inputs the outputs of subscriber concentration module 2 and transit switching module 1 (in one of the third terminal station sets 4), forms the necessary sequence of control and information signals, comm It is connected to the selected terminal station set 4 through the output of the interaction signal connection unit 13 and the control inputs, respectively, the second multi-frequency signaling unit 31, or the linear signaling unit 30, or the common signaling channel unit 12 for transmitting the necessary control signals via the selected communication line 58 to the transit switching module 1 and information signals.

The first block 14 for processing calls based on the received signals gives commands for switching on / off the signals from the output of the interaction signal generator 11 to the corresponding communication line 56, connecting / disconnecting the second multi-frequency signaling unit 31, or the linear signaling unit 30, or the common signaling channel block 12. At the same time, by command from the central processor 21 (Fig. 3), the conversation path is switched off through a fully accessible switching field 23. Thus, all the data necessary for establishing and establishing a connection is transmitted, control and information signals are generated and issued: through the corresponding unit 13 for connecting interaction signals to the subscriber set 15 or the fourth terminal station set 4 for organizing and servicing a call and connecting the conversation path through the first block 14 about call processing, block 32 seal-decompression for the aforementioned call.

If the called and calling subscribers belong to one subscriber concentration module 2, then the second marker 35 generates the necessary sequence of control signals and, through the interaction signal connection unit 13, outputs them to the corresponding subscriber set 15 of this subscriber concentration module 2, and the connection is established through the first processing unit 14 calls, which generates the necessary sequence of signals for closing the conversation path through the first block 14 call processing and block 32 densification-decompression, and all information about the stages of establishing a connection and passing the connection in parallel is transmitted to the Central processor 21 (Fig.3), as described above.

B. Outgoing call (a call from subscribers of complexes 19 of switching equipment or subscribers of other modules 2 of subscriber concentration)

An incoming call from subscribers of complexes 19 of switching equipment (for example, ATS) to subscribers of a digital switching system is serviced similarly to the outgoing call from terminal station set 4 described above.

Signal information received via communication line 58 is fed to the corresponding first terminal station set 4, where it is processed as described above, then fed to the central control channel former 29, then to the first marker 9 via the first control bus 8. The first marker 9 generates and issues control information signals through the block 28 of control channels to the block 22 of coordination of control channels, which is connected to the prices on the third control bus 20, to the programs located in its ROM using RAM data the trailing processor 21. Based on the information received and the data stored in its ROM, the central processor 21 determines to which complex 19 of the switching equipment or to which module 2 of the subscriber concentration the called subscriber is connected, what kind of signaling devices, the complex of 19 switching equipment or the telephone set 3 are equipped , finds a free communication line 58 in the path, generates the necessary sequence of control signals and transmits them through block 22 matching control channels, block 28 channels ION and the first marker 9. Simultaneously, the CPU 21 finds a free space (the free memory location not shown) in-blocking switching network 23, through which all the switches through the speech path. The first marker 9 defines a free communication line 58 to the subscriber concentration module 2 of the required switching equipment complex 19, generates the necessary sequence of control signals and sends them to the corresponding central control channel driver 29, issues commands for switching on / off the first multi-frequency signaling unit 6, block 7 linear signaling, block 10 of the common signaling channel to the first or second terminal station set 4, and the second block 26 call processing as received m gives command signals for connection to the corresponding first or second terminating station set speech path 4 through-blocking switching network 23. Signal flow through the terminating station set 4 previously described.

In this way, all the data necessary to establish a connection is transmitted.

The processing of incoming (outgoing) calls in the subscriber set 15 (figure 4) is as follows.

A. Call from the subscriber. The call from the telephone set 3 via the communication line 56 is sent to the corresponding first matching unit 36, where the state of the communication line 56 is analyzed, and when the line parameters deviate from the normal signal in the chain - the subscriber activity determination unit 16, the signal conversion unit 37, the subscriber signal receiver 17 , the first switch 42, the control signal generation device 40 is transmitted to the first processor 41, where it is analyzed according to a predetermined program, and then a control signal is issued through the first control channel generator 43 Al through the connection signal connection unit 13 and information about the impossibility of establishing a connection through the compression-decompression unit 32 and the first call processing unit 14 to the second marker 35. Further information flow to the central processor 21 is similar to that described above.

If the parameters of the communication line 56 correspond to the norm, then the signal from the first matching unit 36 is supplied to the subscriber activity determination unit 16, where the active or passive state of the subscriber is determined. In the active state, the signal enters the signal converting unit 37, where it is digitized and fed to the subscriber signaling receiver 17 and to the first switch 42 and then to the control signal generating apparatus 40, in which the operation initiation signal of the first processor 41 is generated. The first processor 41 analyzes the received signal according to the data from the first switch 42, the exchange of information with which is carried out on the fourth control bus 39 and is switched by the first switch 42 through the second input-output d subscriber set 15 to the block 32 of the seal-decompression (Fig.2), from where it enters the first block 14 call processing, which gives the command through the block 32 of the seal-decompression to the first switch 42 (figure 4) to switch the issuance of the station communication line 56 signal from the generator 11 interaction signals. The issuance of the station signal stops after the subscriber begins to dial the first digit of the number, which is transmitted through the communication line 56 through the subscriber activity determination unit 16, the signal conversion unit 37, the subscriber signal receiver 17 and the first switch 42 via the fourth control bus 39 to the RAM of the first processor 41, which analyzes the information received. If not all digits of the number are accepted, the next digit of the number is adopted similarly to the above. If all digits of the number are accepted, or the subscriber interrupted the dialing, or there was a failure in the dialing, then the first processor 41 through the first driver 43 of the control channels issues a control signal to the central driver 29 of the control channels and the first switch 42 commutes to the block 32 of the seal-decompression transmitting the received information to the first call processing unit 14, where it is processed and, depending on the situation, a set of commands is issued through the compaction-decompression unit 32: or switching off the conversation path through h the first switch 42, or the removal of a call from service, which is done in one of the ways:

a) a command from the first call processing unit 14 through the second control bus 18 and the interaction signal connection unit 13 (FIG. 2) is sent to the first control channel driver 43 (FIG. 4) and to the first processor 41 via the fourth control bus 39 sends a command to the first switch 42 about removing the conversation path from the seal-decompression unit 32 and switching from the busy signal generator 11 (FIG. 2) to the busy signal to the communication line 56 through the subscriber signal receiver 17, the signal conversion unit 37 c, a subscriber activity determination unit 16 and a first matching unit 36;

b) a hang-up signal arrives from the subscriber’s telephone set 3 through the communication line 56, which arrives at the first matching unit 36, the subscriber activity determination unit 16, the signal conversion unit 37, the subscriber signal receiver 17, and through the first switch 42 via the fourth control bus 39 to the first processor 41, then through the first driver 43 of the control channels (Fig. 4) to the interaction signal connection unit 13 and to the first call processing unit 14 (Fig. 2), which, through the compaction-decompression unit 32, instructs the first switch Oru 42 to remove the conversation path from the seal-decompression unit 32 and switch from the Busy signal interaction signal generator 11 to the communication line 56 through the subscriber signal receiver 17, the signal conversion unit 37, the subscriber activity determination unit 16 and the first matching unit 36.

B. Call to the subscriber

A call to the subscriber from the side of the switching equipment complex 19, for example, another exchange, or the terminal station set 4 comes from the corresponding unit 13 for connecting interaction signals to the first driver 43 of the control channels, then via the fourth control bus 39 to the first processor 41, which, having analyzed the received information , issues a command on the fourth control bus 39 to the first switch 42 for sending a “Call” signal from the interaction signal generator 11 through the subscriber signaling receiver 17, a signal converting unit 37, a subscriber activity determination unit 16, and then to the corresponding first matching unit 36 into a communication line 56 with the telephone set 3.

If the called subscriber picks up the handset, the busy state of the communication line 56 is recorded by the first matching unit 36, a signal is received through the chain - the first matching unit 36, the subscriber activity determination unit 16, the signal conversion unit 37 and the subscriber signal receiver 17 to the first switch 42, which removes the “Call” signal. Then, on the fourth control bus 39, the signal comes from the first switch 42 to the first processor 41, which issues a command on the fourth control bus 39 through the first driver 43 of the control channels to the first switch 42 and to the interaction signal connection unit 13 to switch the conversation path, which is switched through the first switch 42 from the block 32 of the seal-decompression to the corresponding communication line 58.

A call is removed from service in one of the ways described above: a) if the called party is the first to hang up, b) if the calling party is the first to hang up.

Processing of incoming and outgoing calls from complexes 19 of switching equipment (figure 5) is as follows.

A. Incoming call

A service call from the complex 19 of the switching equipment and from the second or third terminal station set 4, respectively, via the communication line 57 or 58 goes to the second matching unit 44, then to the information receiving and transmitting unit 46, where the signal information coming from the lines is processed and arrives at the same time on the second switch 52, the line signal generation unit 47 and the serial-parallel converter 49. The signal processor 48 reads the received information via the sixth control bus 54, processes it according to a predetermined algorithm and writes to the matching device 55. Depending on the algorithm embedded in the ROM of the second processor 50, the latter reads the received information on the fifth control bus 53, processes it according to the specified algorithm, and writes to the matching device 55. Depending on the algorithm embedded in the ROM of the second processor 50, the latter on the fifth control bus 53 accesses the second switch 52 or matching device 55, from where it reads the received and processed signal information and writes sends it to the second driver 51 of the control channels, from where it is transmitted to the corresponding unit 13 for connecting interaction signals or to the central driver 29 of the control channels for analysis. Simultaneously received conversational information from the switching equipment complex 19 or the second / third terminal station set 4, respectively, via the communication line 57 or 58 through the second matching unit 44 and the information transmitting and receiving unit 46 is transmitted to the first and second call processing units 14 and 26.

B. Outgoing call

The control signal from the interaction signal connection unit 13 or from the central control channel generator 29 is fed to the second control channel generator 51, which is connected to the second processor 50 via the fifth control bus 53. The incoming signal in the second processor 50 is processed according to a predetermined program. Depending on the algorithm laid down, the second processor 50 accesses the second switch 52 via the fifth control bus 53, which switches the first and second blocks of the common signaling channel or blocks 7 and 30 of the linear signaling to the information reception and transmission unit 46 or switches off the first and second blocks 6 and 31 multi-frequency signaling to block 46 of the reception and transmission of information or to block 47 of the formation of linear signaling to generate transmitted to the oncoming station signal information through block 46 of the reception and transmission of information to the second block 44 matching, then on line 57 or 58 of the communication. At the same time, the conversation path is switched off as follows: information comes from the first or second call processing unit 14 or 26 to the second switch 52, which commutes it to the second matching unit 44 through the information receiving and transmitting unit 46.

The synchronization of the digital switching system is as follows.

A. Synchronization of work from one of the external sources of synchronization (complex 19 switching equipment)

The synchronization signal is transmitted through the communication line 57 to the synchronization transceiver 45 (FIG. 5), then to the second synchronization signal receiver 33 (FIG. 2), then through the second synchronization switching unit 34 via the communication line 58 to the first synchronization signal receiver 25 (FIG. 3), on the first control bus 8 to the first marker 9, in which are processed according to specified programs and switched to the input of the synchronization system 24. Depending on the specified operating mode, the synchronization system 24 through the first synchronization switching unit 27 (FIG. 3) commits the received synchronization signal to the first and second terminal station sets 4, then, via the communication line 58, the synchronization signal is supplied to the second synchronization signal receiver 33 (FIG. 2) and at the command of the first marker 9 through the first synchronization switching unit 27 to the third receiver 38 of the synchronization signals of the subscriber set 15 (Fig. 4), the third and fourth terminal station set 4.

B. Synchronization from an own generator (not shown) of the synchronization system 24 occurs similarly to the above, only the non-synchronizing signal is switched from an external source — a complex of switching equipment 19, and the signal generated by the synchronization system 24.

Claims (4)

1. A digital switching system comprising a transit switching module, l subscriber concentration modules, l · m · n telephone sets, a transit switching module contains l · k first and p second terminal station sets and a group connection unit containing the first multi-frequency signaling unit, block linear signaling, the first marker and the first block of the common signaling channel connected to the first control bus, the signal output of which is connected to the first inputs l · k of the first terminal station sets, the first inputs whose output outputs are the first l · k inputs and outputs of the transit switching module, the first inputs and outputs of the second terminal station sets are the second p inputs and outputs of the transit switching module and the system as a whole, each subscriber concentration module contains k third terminal station sets, an interaction signal generator, a second block of a common signaling channel, a connection block of interaction signals, a first call processing unit and a subscriber set comprising an activity determination unit nents and a subscriber signaling receiver, the first input-output of the first call processing unit via the second control bus is connected to the first input-output of the interaction signal connection unit, the output of the latter is connected to the control input of the second block of the common signaling channel, the first output of which is connected to the first inputs of k third terminal station sets, the first k inputs and outputs of which are the first k inputs and outputs of the subscriber concentration module, connected to the corresponding first k inputs and outputs of m by transit switching, the second k inputs and outputs of the third terminal station sets are connected to the corresponding second inputs and outputs of the interaction signal connection unit, the signal input of which is connected to the output of the interaction signal generator, characterized in that s · l · q switching equipment complexes are introduced into the system and l · (q-1) subscriber concentration modules, lv of the first terminal station sets, q-1 blocks of group connection and connected to the third the control bus of the first inputs and outputs, the central processor, the block matching the control channels, the fully accessible switching field and the synchronization system, each group connection block additionally contains connected to the first control bus through the first inputs / outputs, the first receiver of synchronization signals, the second call processing unit, the first switching unit synchronization, a block of control channels and a central driver of control channels, the output of which is connected to the control inputs of the first block random signaling, linear signaling unit and common signaling channel unit, and the second and third inputs / outputs are connected to the second inputs and outputs respectively l · (k + v) of the first and p second terminal station sets, the second input-output of the control channel unit is connected to one of the q inputs and outputs of the control channel matching unit, the outputs l · (k + v) of the first and p second terminal station sets are connected to the corresponding inputs of the first receiver of synchronization signals, the output of which is connected to one of the q inputs of the system we are synchronizing, one of the q outputs of which is connected to the input of the first synchronization switching unit, the outputs of the latter are connected to the corresponding fourth inputs l · (k + v) of the first and p second terminal station sets, the third inputs and outputs of which are connected to the corresponding inputs and outputs of the second a call processing unit, the switching input-output of which is connected to the corresponding input-output of a fully accessible switching field, the signal output of the first block of the common signaling channel is connected to the first inputs terminal station sets, and the signal outputs of the first linear signaling unit and multi-frequency signaling unit, respectively, to the second and third inputs l · (k + v) of the first and p second terminal station sets, each subscriber concentration module additionally contains m-1 subscriber sets, v third and s fourth terminal station sets, a second linear signaling unit, a second multi-frequency signaling unit, a seal-decompression unit, and second receivers connected to the second control bus synchronization signals, synchronization switching unit and marker, each subscriber set additionally contains n first matching units, a signal conversion unit, a third synchronization signal receiver and a control signal generation device and a first processor, switch and control channel generator connected to the fourth control bus, each of [ l · (k + v) + p + s + k + v] · q of the terminal station sets contains a second matching unit, a synchronization transceiver, an information transmitting and receiving unit, a forming unit linear signaling, a signal processor, a serial-parallel converter, a second processor, a control channel former and a switch, a fifth and sixth control bus connected to each other via a matching device, the first inputs and outputs of the information reception and transmission unit are connected to the fifth control bus, a linear signaling signal generation unit, a second switch, a processor and a control channel former, the first inputs and outputs of the signal processor and the next are connected to the sixth control bus an in-parallel converter, the second input-output of which is connected to the second input-output of the information reception and transmission unit, the third and fourth inputs and outputs of which are connected respectively to the second inputs and outputs of the second switch and the linear signaling generation unit, and the fifth input-output is connected with the first input-output of the second matching unit, the second input-output of which is the first input-output of the terminal station set, the second input-output of which is the second input-output of the second form control channels, and the first and second outputs are respectively the first output of the information reception and transmission unit and the output of the synchronization transceiver, to the input of which the second output of the information reception and transmission unit is connected, the first, second and third inputs of the terminal station set are connected to the corresponding inputs of the second switch , and the fourth input - with the synchronization inputs of the block of reception and transmission of information, serial-parallel converter, signal processor, block forming a linear Ignalization and the second processor, the third input-output of the terminal station set is connected to the third input-output of the second switch, in each subscriber set the first and second inputs are connected respectively to the first input of the first switch and the input of the third receiver of synchronization signals, the output of which is connected to the synchronizing inputs of the receiver subscriber signaling, a device for generating control signals and the first switch, processor and control channel driver, the second input-output of which I is the first input-output of the subscriber set, the second input-output of which is the second input-output of the first switch, the third input-output of the latter is connected to the second input-output of the control signal generation device, the third input-output of which is connected to the second input-output of the first processor , the fourth input-output of the first switch through a series-connected subscriber signaling receiver, a signal conversion unit and a subscriber activity determination unit is connected to the first inputs and outputs n of the first matching blocks, the second inputs and outputs of which are n third inputs and outputs of the subscriber set, which are connected to the corresponding telephone sets, in each subscriber concentration module, the second and third inputs and outputs are connected respectively to the first inputs and outputs s of the fourth terminal station sets and m subscriber sets, the second inputs and outputs of which are connected respectively to the third and fourth inputs and outputs of the unit for connecting interaction signals, the output of which is connected to the control the influential inputs of the second linear signaling unit and the multi-frequency signaling unit, the first outputs of which are connected respectively to the second and third inputs k + v of the third terminal station sets, and the second outputs are connected respectively to the second and third inputs s of the fourth terminal station sets, the third output of the second multi-frequency block signaling is connected to the first inputs m of subscriber sets, the second output of the second block of the common synchronization channel is connected to the first inputs s of the fourth terminal stations ion sets, the first, second and third outputs of the second synchronization switching unit are connected respectively to the second inputs m of the subscriber sets and the fourth inputs k + v of the third and s fourth terminal station sets, the outputs of the mentioned terminal station sets are connected respectively to the first and second inputs of the second signal receiver synchronization, the second input-output of the first call processing unit is connected to the first input-output of the seal-decompression unit, the second, third and fourth inputs and outputs of orogo associated respectively with is connected to the second input-output of the corresponding subscriber unit concentration of the third inputs-outputs m subscriber sets and third inputs, outputs k + v s third and fourth terminal station sets, each set of switching equipment. 2. The digital switching system according to claim 1, characterized in that the complex switching equipment is made in the form of an automatic telephone exchange. 3. The digital switching system according to claim 1, characterized in that the complex switching equipment is made in the form of an ISDN terminal. 4. The digital switching system according to claim 1, characterized in that the complex switching equipment is made in the form of a computer network.

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