RU79737U1 - SUBSCRIBER DIGITAL HUB - Google Patents

Abstract

The proposed utility model relates to the field of automatic telephony, in particular to telephone subscriber digital concentrators (ACC) and is intended for use on public telephone networks. The technical result is achieved by the fact that the control and switching unit modular additionally contains a pulse-code modulation module that implements the V5.2 protocol in accordance with international recommendations and is connected by the ISA bus to the central processor module, digital switch and signal processor module, and further to the cross-expansion unit master, consisting of the first coordination node, through the device controller, upgraded, consisting of the second coordination node and the ADC / DAC node, connected by the control bus Ia, the device controller is connected to the upgraded subscriber sets, and redundant power supply provides power to all upgraded subscriber units digital concentrator, besides the source of ringing voltage to subscriber set is connected.

Description

The proposed utility model relates to the field of automatic telephony, in particular to telephone subscriber digital concentrators (ACC) and is intended for use on public telephone networks.

A device is known - a subscriber concentrator URA of an electronic automatic telephone exchange (EATS) MT-20/25, (Sharipov Yu.K., Koblyakov V.K. Domestic telecommunication systems. 3rd edition, revised and additional - M .: Logos, 2005, p. 57). EATS uses two types of concentrators: local and remote (remote). The communication interface between the hubs and the switching field of the EATS is carried out via digital channels with pulse-code modulation (E1 paths), and it is the same for both local and remote URA.

The URA Hub is a seven-level auto-focus cabinet. The first, second, fourth through seventh levels of the cabinet are subscriber (EA level). The third level is the governing one for the entire cabinet as a whole (PC or microcomputer level). The EA level, as a rule, consists of sixteen blocks of subscriber sets (EA-O, EAD, EAR, EAS), two CODEC blocks, a CDA block and a PASS block. At the EA level, there are four primary protection units for subscriber sets against external overvoltages and excess currents (PRO) and a power source (CB3C). The EA-O unit provides temporary multiplexing / demultiplexing of telecommunication signals, contains sensors for the status of the loop of the subscriber line, relay call and switching to the testing unit. Each subscriber kit converts a two-wire subscriber line telecommunication signal scheme into a four-wire circuit for a CODEC card. The CODEC unit implements digital-to-analog and analog-to-digital

conversion of multiplexed telecommunication signals by the method of pulse-code modulation (PCM) according to the A-law in accordance with ITU-T G.711. Two CODEC boards are used, each of which converts the multiplexed telecommunication signals of the predefined EA-O boards (8 boards for each CODEC board). The CDA unit exchanges digital differential signals with a PC level, generates clock signals for CODEC boards, and scan / control signals for EA-O boards. The PCM telecommunication signals are transmitted to the PC layer via two communication lines with a speed of each line of 2048 kbit / s (16 × 8 = 128 telecommunication signals of subscriber sets are multiplexed in 2 × 32 time intervals). As a result, a concentration of 0.5 is carried out at the EA level. The PASS block generates teletax signals; interface between the central and subscriber cells. The PC level includes a microcomputer (PU-32), a memory device (MEMURA), a machine communication device (LICURA), a Semaphore terminal (SEMA), a marker scanner (EXMQ), a test machine (ROBOT) and an access device to teletype (DAM).

The disadvantages of the considered analog are:

- the ability to block the communication of subscribers during calls within the level;

- limitation of the applicability of the hub due to the connection to the switching equipment using the specific Semaphore protocol, which only supports the EATS MT-20 switching module and the Omega automatic telephone exchange NPO Raskat; the inability to provide digital subscriber lines (AL) basic access (BRA) ISDN, designed to transmit voice and data at a speed of 144 kbit / s.

The essential features common with the claimed utility model are:

- blocks of subscriber sets;

- blocks of secondary surge protection (in the claimed utility model - blocks of surge protection).

Also known is the DLU device DATS EWSD (Siemens) (MI Chaklova Digital Station EWSD: Study Guide for the course "Switching Systems" for the student specialty "Telecommunication Networks", "Multichannel Telecommunication Systems" full-time and part-time education / M. I. Chaklova. - Mn .: BSUIR, 2003, p. 8). DLU consists of: SLMA, providing connection of lines of analog subscribers SLMD, providing connection of lines of digital subscribers ISDN BRA, DIUD, providing E1 interface for connecting to the PBX switching field (to LTG), DLUC, providing control of the above units. DLU is designed to concentrate the schedule from subscribers, it is installed either on the network node itself, or in the form of remote units that are located in close proximity to subscriber groups. Remote DLUs are used as subscriber hubs. Each DLU block is connected via DIUD to two different linear groups of LTG PBX switching fields, and all modules of this block having the same functions are duplicated and operate in load sharing mode. Connection is carried out on one, two, four multiplex lines of the primary digital stream (PDC 2048 Kbps). Local connection to LTG is carried out on two lines - 4096 Kbps. To transfer control information inside the EWSD system, a simplified CCS No. 7 signaling option is used.

The disadvantage of the considered analogue is the limitation of the applicability of the hub due to the use of a specific protocol for connecting to switching equipment (a simplified version of CCS signaling No. 7).

The essential features common with the claimed utility model are:

blocks of analog subscriber sets SLMA (in the claimed utility model, subscriber sets and nodes of surge protection);

DLUC control unit (in the claimed utility model BUKM).

Of the known devices, the closest to the claimed utility model is the Proton-SSS subscriber digital concentrator (TU KYUGN. 465235.020). The prototype consists of a unit of a switching and control unit modular 1 (BUKM) (FIG. 1), containing a central processor module 2 (MCP) that processes and controls the upper level; a digital switch 3 (CC), which carries out switching of PCM digital streams, a signal processor module 5 (ICP) according to the MCP 2 commands received via the ISA 4 bus; blocks of subscriber sets 6 ₁ -6 _N (LHC), each of which contains exchange nodes 7 ₁ -7 _N , providing communication with 1 (LPCM) and subscriber sets 8 ₁ -8 _N (AK) and nodes of protection against external overvoltages 9 ₁ -9 _N; block of digital terminations 10 (BTSO), which is a cross-board for installing a block of pulse-code modulation universal 11 (submodule BIKMU), consisting of the first central processor 12 (CPU 1) connected to the coding / decoding unit of the E1 13 path (FALC) ; the base access termination unit 14 (BOBD), consisting of a second central processor 15 (CPU2) connected to a linear interface node U _k 16 (IEC); uninterruptible power supply unit 17 (UPS), consisting of power modules 18, 19, 20, 21 and supplying power to each ACC unit.

The SME module 5 of the БУКМ 1 unit, under the control of the МЦП 2 module via the ISA 4 bus, through the ЦК 3 module, controls the LHC 6 ₁ -6 _N units. The CC module 3 of the BUKM 1 unit is connected to the exchange unit 7 of the BAC and to the central control unit 10 via the control bus 22. In the BIKMU 11 submodule, the node 12 (CPU 1) processes and generates the V5.2 protocol. In block BOBD 14 node 15 (CPU 2) performs the processing and formation of the BRI protocol. The coding / decoding unit of the E1 13 path (FALC), as well as the linear interface unit U _k 16 (IEC), form the physical interface in accordance with international recommendations.

The essential features of the prototype, common with the claimed utility model, are: the control and switching unit is modular,

which includes a central processor module, a digital switch, a signal processor module, connected by an ISA bus, connected by a control bus to the LHC and CCU exchange node via the control bus, as well as to the second central processor and the linear interface node of the base access termination unit, implementing the BRI protocol in accordance with international recommendations. The disadvantages of the prototype are:

- the limitation on the subscriber capacity due to the use of a separate block of BCO, occupying a slot place,

- low reliability of the ACC due to the centralized power supply system (UPS unit), as well as due to the combination of protection nodes from external overvoltages and subscriber sets in the LHC units.

The objective of the utility model is to increase the hub capacity, increase its applicability with a wide range of switching equipment through the use of the standard access protocol (connection) V5.2.

To achieve a technical result, a subscriber digital hub, consisting of a modular control and switching unit, which includes a central processor module, a digital switch, a signal processor module, connected via the ISA bus, connected to the second central processor and the linear interface node of the base access termination unit, implements the BRI protocol in accordance with international recommendations, the control bus, as well as with subscriber kits connected to the protection nodes from overvoltage, it is supplemented by the fact that the control and switching unit modular additionally contains a pulse-code modulation module that implements the V5.2 protocol in accordance with international recommendations and is connected by the ISA bus to the central processor module, digital switch and signal processor module and further to the expansion unit cross-host, consisting of the first coordination node, through the device controller, upgraded,

consisting of a second coordination node and an ADC / DAC node connected by a control bus, and the upgraded device controller is connected to subscriber sets, and the redundant upgraded power supply provides power to all blocks of the subscriber digital hub, in addition, the ring voltage source is connected to subscriber sets.

The technical result is achieved by the fact that the control and switching unit modular additionally contains a pulse-code modulation module that implements the V5.2 protocol in accordance with international recommendations and is connected by the ISA bus to the central processor module, digital switch and signal processor module, and further to the cross-expansion unit master, consisting of the first coordination node, through the device controller, upgraded, consisting of the second coordination node and the ADC / DAC node, connected by the control bus Ia, the device controller is connected to the upgraded subscriber sets, and redundant power supply provides power to all upgraded subscriber units digital concentrator, besides the source of ringing voltage to subscriber set is connected.

The block diagram of the proposed ACC is presented in figure 2, where

1 - control and switching unit modular;

2 - central processor module;

3 - digital switch;

4 - bus ISA;

5 - signal processor module;

6 - module pulse code modulation;

7 - the unit for expanding the cross setting;

8 - the first node coordination;

9 - device controller upgraded;

10 - the second node coordination;

11 - node analog-to-digital and digital-to-analog conversion;

12 ₁ -12 _N - subscriber sets;

13 ₁ -13 _N - nodes surge protection;

14 - control bus;

15 - source of ring voltage;

16 - end access block;

17 - the second central processor;

18 - node linear interface;

19 - redundant power supply redundant.

The proposed ACC works as follows: when the caller picks up the handset, the loopback loopback signal through node 13 ₁ enters the set 12 ₁ , then through the control bus 14 to the second node 10 of the device controller upgraded 9, and then through the first coordination node 8 via ISA 4 to the digital switch 3, which in turn transmits this signal to the central processor module 2 through the signal processor module 5. The loop circuit signal processed and encoded in a certain way comes from the module the central processor 2 into the pulse-code modulation module 6 and further into the external switching equipment. In response, from the external switching equipment through the pulse-code modulation module 6, a command is sent to the central processor module 2, which, in accordance with this command, sends a “Station response” signal through the digital switch 3, then via the ISA 4 bus, the first coordination node 8, device controller upgraded 9, analog-to-digital and digital-to-analog conversion unit 11, control bus 14, subscriber set 12 ₁ , surge protection unit 13 _{1 to the} calling subscriber. The caller, having received the “Station Response” signal, starts dialing a number that follows a path that repeats the path of the loopback signal described above. At the end of dialing, from the external switching equipment, through the pulse-code modulation module 6, the digital switch 3 receives a command to make a call to the called subscriber. This command

is decoded by the module of the central processor 2 and, through the signal processor module 5, then the digital switch 3, via the ISA 4 bus, through the first matching node 8, the device controller upgraded 9, node 10, via bus 14, enters the subscriber set 12 ₂ and then to surge protection unit 13 ₂ . The called party rings the bell. When the called subscriber answers through the overvoltage protection unit 13 ₂ , a loop closure signal is received, which passes the path described above, except for the subscriber set 12 ₁ , to the place of which the subscriber set 12 ₂ is now used. Having received this signal, external switching equipment connects two subscribers. At the end of the conversation, one of the subscribers (for example, the caller) hangs up the telephone. In this case, the loop open signal through the overvoltage protection unit 13 ₁ enters the subscriber set 12 ₁ , then through the node 10, the device controller upgraded 9, the first coordination unit 8, ISA 4 bus, digital switch 3, through the signal processor module 5 enters the module central processor 2. Processed and encoded in a certain way, the loop open signal is sent from the central processor module 2 to the pulse-code modulation module - 6 and then to the external switching equipment. In response, from the external switching equipment through the pulse-code modulation module 6, a command is sent to the module of the central processor 2, which, in accordance with this command, sends a busy signal through the digital switch 3, then via the ISA 4 bus, the first coordination node 8, the controller devices upgraded 9, the analog-to-digital and digital-to-analogue conversion unit 11, the control bus 14, the subscriber set 12 ₂ , the surge protection unit 13 _{2 to the} called subscriber. Upon receiving the busy signal, the called subscriber hangs up, which initiates the loop open signal, which through the surge protection node 13 ₂ enters the subscriber set 12 ₂ , then through node 10, the device controller upgraded 9, the first coordination node 8, ISA bus 4, module 3, through the signal processor module 5 enters the module

central processor 2. Processed and encoded in a certain way, the loop open signal is supplied from the central processor module 2 to the pulse code modulation module 6 and then to the external switching equipment. External switching equipment disconnects the subscribers. ACC returns to its original state.

Claims (1)

A subscriber digital hub, consisting of a modular control and switching unit, which includes a central processor module, a digital switch, a signal processor module connected via an ISA bus connected to a second central processor and a linear interface node of the basic access termination unit that implements the BRI protocol in in accordance with international recommendations, the control bus, as well as with subscriber kits connected to overvoltage protection nodes, characterized in that the control and switching unit modular additionally contains a pulse-code modulation module that implements the V5.2 protocol in accordance with international recommendations and is connected by the ISA bus to a central processor module, a digital switch and a signal processor module, and then to a defining cross-expansion unit consisting of the first node coordination through a device controller upgraded, consisting of a second coordination node and an ADC / DAC node connected by a control bus, and the controller of the modernization devices ovanny connected to the subscriber sets and redundant power supply provides power to all upgraded subscriber units digital concentrator, moreover, the source of ringing voltage to subscriber set is connected.