BG421Y1 - Communications transmission system - Google Patents

Abstract

The system ensures simultaneous transmission of several messages between two telepnone exchanges on one connection line. A two-way analogue-digital converter (2, 2') and compressor/decompressor unit (3, 3') are designed for each connection line (1, 1') connected to switch (11, 11') across a set for a connection line (13, 13') of any of the telephone exchanges (12) 12'). All units (3, 3') are interconnected across the single connection telephone line (6) by means of a duly designed multiplexor/demultiplexor (4, 4') each designed on both sides. The latter are connected to one modem (5, 5') each for the modulation/demodulation of the simultanously transmitted signals along line (6). 2 claims, 6 figures

Description

The utility model relates to a messaging system, in particular a telephone system, in which two telephone exchanges can be connected in one line.

BACKGROUND OF THE INVENTION

BG 43Y1 has a known system for simultaneous transmission of messages from several subscribers to an automatic telephone exchange on one ordinary telephone line. For each subscriber, on the subscriber side, two-way analog-to-digital converter and a compressor / decompressor block are provided in series, and two-way decompressor / compressor blocks and a switch via digital-analog converters, respectively, are connected from the automatic telephone exchange. All compressor / decompressor units are connected to a single telephone line by means of a single multiplexer / demultiplexer provided on both sides respectively. The latter are connected to one modem for modulating and demodulating simultaneously transmitted signals along the line.

The purpose of the utility model is to transmit more calls on one line between two telephone exchanges.

The technical nature of the utility model

The objective is achieved through a messaging system comprising a line for connecting two telephone exchanges, at each end of which is connected a modem block for modulating and demodulating data in accordance with the intended transmission. Each modem block is connected to its respective multiplexer / demultiplexer. The switches of the two PBXs through two-wire or three-wire physical line kits or for an E&M signaling link and connecting lines are connected to bidirectional analog-to-digital converters and corresponding multiplexers / demultiplexers. The connection between the modem block and the multiplexer / demultiplexers is via a compressor / decompressor block.

By means of these means, it is possible to transmit a certain number of times10 calls or to carry out other data transmissions simultaneously on the existing line between the two telephone exchanges, depending on the quality of the line or the whole connection.

For example, in a line of 26 km in length and a cable diameter of 0.9 mm, up to four voice signals could be transmitted at the same time15 without compromising quality.

Due to the utility model means, conditions can be provided so that the normal line lengths and cross sections of the cores are sufficient 20 to achieve a bit error rate better than 10E-6. The distances that can be covered without signal recovery range from 5 to 38 km, depending on the quality of the line, the cross section of the cable 25, the condition of the line and the presence of deviations or short sections with different cross sections.

Line-connected bidirectional modem blocks can modulate and demodulate data, for example, according to ITU-T standards. In principle, however, modulation and demodulation can be performed by other standards.

According to an embodiment of the utility model, the link for connection of the two PBXs in the messaging system can be connected at one end of the connection directly to the switch by means of a series modem block and a compressor / de40 compressor block.

According to the utility model, it is possible for four calls to be transmitted at the length of the connecting lines from 5 to 38 km. This carryover length can be doubled to 45 or triple using one or two signal recovery devices.

Description of the attached figures

The utility model will be further explained by means of the attached figures, of which:

Figure 1 shows a block diagram of a messaging system comprising two-wire coupling kits;

Figure 2 is a block diagram of a system comprising three-wire physical coupling kits;

Figure 3 is a block diagram of a system comprising couplings for E&M signaling;

FIG. 4 is a block diagram of a system comprising interconnect kits of the listed in FIG. 1, 2 and 3;

Figure 5 is a block diagram of a messaging system in which digital signals are transmitted from one switch connection link by a switch;

Figure 6 is a complete block diagram of a messaging system.

Examples of implementation of the utility model

Figure 1 shows a messaging system in which a modem block 5 and a multiplexer / demultiplexer 4 to which the compressor / decompressor blocks are connected to the sole telephone line 6 for connection between the two automatic telephone exchanges 12, 12 '

3. The connection between the switch 11 of the PBX 12 and the two-way analog-to-digital converters 2 and the compressor / decompressor units 3 connected in series for each connection line 1 is made through kits for a two-wire physical connection line 13a.

Figure 2 presents a messaging system in which a modem block 5 and a multiplexer / demultiplexer 4 to which the compressor / decompressor blocks 3 are connected to the sole telephone line 6 for connection between the two automatic telephone exchanges 12, 12 ' The connection between the switch 11 from the PBX 12 and the two-way analog-to-digital converter 2 and the compressor / decompressor unit 3 connected in series for each connection line 1 is made through three-wire physical coupling kits. line 13b.

Figure 3 illustrates a messaging system in which a modem block 5 and a multiplexer / demultiplexer 4 to which the compressor / decompressor blocks are connected to the sole telephone line 6 for connection between the two automatic telephone exchanges 12, 12 ' 3. The connection between the switchboard 11 of the PBX 12 and the two-way analog-to-digital converter 2 and the compressor / decompressor unit 3 connected in series for each connection line 1 is made through connection sets with E&M with gnalizatsiya 13c.

Figure 4 shows a block diagram of a messaging system in which a modem block 5 and a multiplexer / demultiplexer 4 to which a compressor is connected are connected to the sole telephone line 6 for connection between the two automatic telephone exchanges 12, 12 '. decompressor blocks 3. The connection between the switch 11 from the PBX 12 and the two-way analog-to-digital converter 2 and the compressor / decompressor block 3 connected in series for each connection line 1 is made through sets of different types - for two-wire 13a, three-wire physical connection line 13b and for connection with E&M signaling 13c.

Figure 5 shows a particular case of a messaging system in which a modem block 5 and a multiplexer / demultiplexer 4 are connected in series to a single telephone line 6 for communication between the two automatic telephone exchanges 12, 12 ', on one side of the connection, to which the compressor / decompressor blocks are connected 3. The connection between the switch 11 from the PBX 12 and the two-way analog-to-digital converter 2 and the compressor / decompressor block 3 connected in series for each connecting line 1 vein in kits for connecting line 13 of the same or different type - for the two-wire, three-wire physical connecting line and a coupling line with the E & M signaling. On the other side of the link, line 6 is directly connected to the switchboard 11 of the PBX 12 'via a series-connected modem block 5' and a compressor / decompressor block 3.

Figure 6 is a complete block diagram of a messaging system in which a modem block 5, 5 'and a multiplexer / demultiplexer 4 are sequentially connected to the sole telephone line 6 for connection between the two automatic telephone exchanges 12, 12' on each side of the connection. , 4 'to which the compressor / decompressor units 3, 3' are respectively connected. The connection between the switches 11, 11 'from the PBXs 12, 12' and the 1.1 'bidirectional analog-to-digital converter 2, 2' and the compressor / decompressor unit 3, 3 'connected in series for each connection line is made through connection line kits 13, 13 'of the same or different type - for a two-wire, three-wire physical connection line and for an E&M signaling connection line.

The analog-to-digital converters 2 are connected on one side to the compressor / decompressor units 3 and on the other via connection line 1 to sets 13a (respectively 13b, 13c) for a connection line in the automatic telephone exchange 12.

Analog-to-digital converters 2 convert, on the one hand, analog signals from the connecting lines 1 into digital signals and, on the other hand, digital signals received from the connected to the converters 2 digital signals into analog signals, which are transmitted through the connecting lines 1 and kits 13a (13b, 13c) for the connection line to the switch 11.

In this case, the transducers 2 transmit digital signals, which are transmitted to the respective compressor / decompressor units 3 at a transmission rate of about 64 kb / s.

These compressor / decompressor units 3 operate in a bidirectional fashion because they compress the signals from the analog-to-digital converters 2 and decompress the digital signals from the multiplexer / demultiplexer 4 and then transmit them to the converters 2.

In this case, the two-way compressor / decompressor units 3 compact the signals received from the converters at a speed of 64 kb / s at 32, 24 or 16 kb / s, depending on the algorithm of compaction or quality requirements. The decompression is done in reverse order.

The multiplexer / demultiplexer 4 also operates bidirectionally, processing on the one hand the multiplexing signals received from the switch on the connecting lines 1 into one signal, and on the other hand, in the demultiplexing mode, distributing the incoming ones from the line 6, respectively from the connected ones. with it modem 5, signals on the separate connection lines 7. In addition to the call and transmission data, additional and switching technical information regarding dialing, connection building, billing, transit is transmitted on line 6 nformation. If the system is operating according to ITU-T standard, then the data format on line 6 may conform to the standard specified by this standard on the digital network UO bus with ISDN service integration. Although the UO interface is specified by the ITU-T as a base access interface, in the utility model it is used to communicate between automatic telephone exchanges.

The multiplexer / demultiplexer 4 'operates in a bidirectional manner, dividing signals from the line 6, respectively from the connected modem 5', on the one hand, into signals on the individual connecting lines 7 ', and on the other hand processing in the multiplexing mode. signals from the switch 11 'on connecting lines 1' into one signal.

The two-way compressor / decompressor units 3 'decompresses 32, 24, or 16 kb / s of 64 kb / s from the connecting lines 7' and feeds them to the analogue-to-digital converters 2 '. The compression is performed in reverse order.

Analog-to-digital converters 2 'are connected on one side to the compressor / decompressor units 3' and on the other via connection lines D to kits 13 'for a connection line in the automatic telephone exchange 12'.

Analog-to-digital converters 2 'convert, on the one hand, incoming two-way compressor / decompressor units 3' from the connected transducers 2 'digital signals into analog signals transmitted through the connecting lines 1' and the coupling kits 13 'to the switch 11 'and, on the other hand, the analog signals coming from the connecting lines D in digital signals.

Compressor / decompressor units 3 'are connected on one side to modems block 5' and on the other via connecting lines 1 'to switch 1D in the automatic telephone exchange 12'.

These compressor / decompressor units 3 'operate bidirectionally as they compress the 11' signals coming from the switch, and decompress the modem 5 'signals received from the modem and then transmit them to the 1D switch.

Claims

Claims (2)

1. A messaging system, in particular a telephone system, comprising a line for connecting one automatic telephone exchange to another automatic telephone exchange, at either end of which a respective modem block is connected to modulate and demodulate the data in according to the intended transmission, which modem block is connected to a corresponding multiplexer / demultiplexer, which at its other end is connected 25 to a corresponding compressor / decompressor block, wherein the connecting lines of the switches are connected to a dual Axial-to-digital converters connected to compressor / decompressor units, characterized in that the connection between the connecting lines (1,1 ') and two-way analog-to-digital converters (2,2') on the one hand and the switches (11,1G) on the other, it is made either by means of two-wire 10 physical coupling kits (13a) or three-wire physical coupling kits (13b) or by connecting lines with E&M signaling (13c) or by a combination of three 15 types (13a, 13b, 13c). Message system according to claim 1, characterized in that at one end, the connection between the line (6) and the switch (1G) is via a series-connected modem block (5 ') and a compressor / decompressor block (3' ), which can also be built into the work volume of the PBX (12 ').