RU18814U1 - DIGITAL TRANSMISSION SYSTEM FOR TWO FREE CABLE PAIRS, NOT CALLING THE HANDLING IN AN ANALOGUE COMMUNICATION SYSTEM WITH FREQUENCY SEAL - Google Patents

Description

1. Name of utility model

A digital transmission system for two free cable pairs that does not cause interference in an analog communication system with frequency multiplexing.

Further, the claimed utility model is briefly referred to as “MEGATRANS. Field of technology: Telecommunications. Data transmission systems. IPC heading index: H04J.

2. The level of technology

Systems of high-speed digital data transmission over a copper-cable line using amplitude-phase modulation without carrier transmission (Carrierless Amplitude and Phase Modulation, abbreviated CAP), made in accordance with the technology of the digital subscriber line (Digital Subscriber Loop, abbreviated DSL), which meets international standards Telecommunication Union, Telecommunication Standardization Sector (International Telecommunication Union Telecommunications Standartization Sector, abbreviated ITU-T) with documents numbered G.703 and O.704.

The closest analogue is HDSL (High-bit-rate DSL) equipment, developed by Paradyne Corporation based on CAP technology with a data transfer rate of up to 2 Mbps (for example, Hotwire 798X TDM HDSL Endpoints. See website: http : //www.paradyne.com/. and the use of CAP technology in HDSL systems is described in Garrick Case, Kevin Mullaney. Performance Technologies to use Paradyne HDSL system. AT&T News Release, JUNE 10.1992)

3. The essence of the utility model

Utility Model Purpose

The purpose of the MEGATRANS utility model is to increase the range and noise immunity of digital transmission systems to the level that is required to solve the problem of digitalization of trunk, zone and local copper-cable communication lines sealed with analogue equipment with frequency division of channels.

Task and characteristics of utility model

Utility model “MEGATRANS is a specially selected original combination of technical solutions that allows to realize the goal formulated above by solving the following problem:

providing El digital data stream (ITU-T G.703 / G.704) over free copper-cable lines of an analog system of frequency separation of channels equipped with K-60 type equipment, with the possibility of continuing the work of analog frequency channels and selling up to 180 new analogue tone-frequency channels or digital channels with a bandwidth of kbit / s,, 2, ... 32.

MEGATRANS models on most cable lines equipped with K-60 type systems);

ensuring operability in a system with regenerators with installation of up to 12 remotely-fed linear regenerators in sealed enclosures in parallel with amplifiers of the analog system, suitable for installation in containers of maintenance-free amplification points (NPs) with the ability to control a digital system and replace the telemechanics and office communication signal transmission system that operated in an analog system, to a telemechanics and intercom system operating in a digital system;

when installing the MEGATRANS system, free pairs of an existing analog communication system equipped with K-60 equipment should be used for digital transmission of the E1 stream without disconnecting and without conducting any cable work using only the existing facilities of NUP and OUP (serviced amplification point) with full the implementation of the function of official communications and telemechanics.

An original combination of technologies embedded in a utility model

Linear coding

There are many types of DSL-type digital data transmission systems (see, for example, the book by OM Denisiev, DG Miroshnikov. Communications for the “last mile. Third edition. M., Eco-Trends - NTC NATEKS, 2000. 137 s). Let's consider the most suitable for solving the problem - HDSL (high-speed DSL), MDSL (Multi Rate DSL - multi-speed DSL), IDSL (DSL using the digital integrated service network IDSN).

The IDSL system is low-speed (128 kbit / s), so too many cable pairs will be required to organize a primary 2 Mbit / s stream.

HDSL provides duplex transmission of a 2 Mbit / s stream in two pairs. The first technical problem is that the length of the regeneration section of analog systems (up to 22 km, cable with a 1.2 mm cable) actually exceeds the capabilities of HDSL technologies. For HDSL systems at a speed of 2 Mbps using 2B1Q encoding, the maximum that can be obtained is 13 ... 14 km. For HDSL equipment using more advanced ATS modulation, the usual value of the data transmission range at a transmission speed of 2 Mbps is 15 ... 17 km.

MDSL with CAP modulation transmits a variable-speed stream (from 128 to 2048 kbit / s) one pair at a distance of 13-14 km at a speed of 2 Mbps.

The MEGATRANS system proposes to use the multi-speed asymmetric DSL technology with CAP modulation using an analog signal processing and signal correction circuit with the possibility of adjusting the asymmetry depth (for example, AOKS developed and manufactured by NTC NATEKS CJSC) using two pairs, when two pairs are transmitted information in the forward and reverse directions with different speeds, which allows the E1 stream (2048 kbit / s) to transmit over 22 km, which is enough to solve the problems of digitalization of trunk lines, since the overwhelming ost current amplifying sections of K-60 is shorter than 22 km.

Linear Matching Scheme

interference depends on the length of the regeneration sections, the type of cable and the selection of pairs. It is not possible to completely avoid interference using standard xDSL solutions; especially taking into account the fact that the parameters of the line with a core diameter of 1.2 mm, characteristic for analog communication systems of the K-60 type, differ significantly from the parameters of the 0.4 mm line, for which constructive European solutions for implementing DSL technologies are usually designed.

The MEGATRANS system offers a solution that is optimized for the task at hand, which consists in including in the system a special matching scheme with the line (developed and manufactured by STC NATEKS) with the possibility of adjusting the matching parameters and load, which can virtually eliminate the interference of the digitalization system and analog equipment.

Regenerators and remote power

Analog systems of the K-60 type provide an increase in the range by installing amplifiers after 15-22 km with remote power, located in maintenance-free points along the highway. Standard xDSL systems do not have this capability.

In the MEGATRANS system, it is proposed to use regenerators (for example, developed and manufactured by NTC NATEKS CJSC) and remote power sources of these regenerators (for example, developed and manufactured by NTC NATEKS CJSC) in parallel with the equipment of analog systems in the same NUP containers to provide power to the regenerators signal pairs with up to 6 regenerators on each side.

Control and transmission of telemechanics and intercom signals

The main route can be hundreds of kilometers long. In this case, the operator should be able to see from the end point where some damage to the cable segment or the construction of the LLP (flooding, etc.) has occurred. The repair team must have official voice communication from the premises of the NUP with the operator. All these functions, of course, are absent in ordinary xDSL modems.

In the MEGATRANS system, it is proposed to use a personal computer (for example, with special software developed by STC NATEKS) or a video terminal (for example, UT-100) to solve the problem of controlling and transmitting signals from telemechanics and intercom systems.

So, the claimed system “MEGATRANS is based on DSL technology with CAP modulation with asymmetric multi-speed transmission over two free pairs using an analog processing and signal correction circuit with a matching circuit with a line using regenerators and remote power supply for regenerators using a signal pair and using the system control and transmission of telemechanics and office communication signals based on a personal computer or video terminal, which completely solves the utility model posed above task.

4. List of figures

5. Information confirming the possibility of implementation

The utility model “MEGATRANS is used to implement a digital transmission system for long cable lines based on equipment of the MEGATRANS series (within the framework of the universal FlexGain platform, developed and manufactured by NTC NATEKS) using free pairs of analog communication systems based on K-60 type equipment . This equipment in the performance of MEGATRANS-2 L is used to organize linear paths with a large number of remotely powered regenerators - from 2 to 6 on each side. A line length of up to 240 km is achieved without intermediate power supply points (cable with a core diameter of 1.2 mm). The line path terminal equipment is delivered in a cassette version (modular cassette 19, regenerator remote power supply unit, LIU high voltage interface board, LTU line termination unit or NTU network termination unit). The regenerator is delivered in a plastic waterproof or in a metal tight case.

Digitalization equipment “MEGATRANS is based on a modern elemental base and high-performance microprocessor devices. Each segment of the linear path is constantly diagnosed by the built-in tools of the MEGATRANS system in full accordance with ITU G.826 recommendation.

Monitoring data of each segment of the system, as well as remote configuration options are available to the operator from any of the endpoints. Thus, the search for damage on the cable route is greatly simplified. It is possible to connect a portable control terminal to any of the linear regenerators. The system is controlled using the VT-100 terminal or a personal computer.

The linear paths of the MEGATRANS system are constructed, as a rule, according to a two-cable scheme, one pair is used in each cable (Figure 1). In the reception cable and the transmission cable, the cores free from the use of K-60 equipment are used to transmit the E1 digital stream from the automatic telephone exchange (PBX) or the MUX multiplexer. The regenerator of the MEGATRANS system is mounted in existing facilities (tanks) of NUP or OUP in a waterproof or sealed enclosure (under pressure). Due to the large length of the regeneration section in the vast majority of applications, the installation of additional regenerators along the route is not required: the existing containers of NUP of analog transmission systems are used. In rare cases, when the linear-cable structures are in poor condition, it is possible to use a decrease in linear speed, use additional pairs or install an additional regenerator to block particularly long sections.

In MEGATRANS regenerators it is possible to connect an intercom and install telemechanics modules for connecting flood sensors, tamper sensors, etc. Multiplexer equipment or data transmission equipment can be installed at endpoints or at endpoints and intermediate points. Multiplexer equipment provides the conversion of the aggregate stream E1 into analog 2 ... 4-wire channels (tone frequency) or into analog channels with signaling via a loop. It is possible to output data transmission channels with a speed of Kbps (, 3, .. .32) with V.24, V.35, V.36, X.21 interfaces, including Frame Relay and IP protocols.

utility model

If it is necessary to convert the E1 stream, available at the output of the equipment of the linear path, into two E1 streams or 60 analog channels (tone frequency), the PCM / ADPCM transcoder (PCM pulse-code modulation, ADPCM adaptive differential PCM) can be used. Transcoding is carried out in accordance with the recommendation of ITU G.726. A significant improvement in the quality of voice transmission compared to analog systems is provided.

For each of the channels, transmission of modem and fax messages with a speed of up to 9600 bps is possible. It is possible to select one or more uncompressed channels (PCM 64 Kbit / s) for modems to operate at speeds up to 33600 Kbit / s.

For the purposes of data transmission, as well as to significantly increase the throughput of the linear path, the use of data transmission equipment using the asynchronous transmission method (ATM) is recommended.

The certificate of the Ministry of Communications of Russia (No. OS / 1-SP599) has been issued for the MEGATRANS system for use in all sections of communication networks in Russia. In the certificate, in particular, it is noted that “the quality system adopted by the manufacturer ensures the stability of the characteristics of certified equipment and complies with GOST R ISO 900196.

Claims (2)

1. A digital transmission system for cable lines using amplitude-phase modulation without carrier transmission, made in accordance with digital subscriber line technology, characterized in that it simultaneously includes a stream transmission system over two copper-cable lines with the possibility of conversion to analog ( tonal frequency) and digital channels with a data transfer rate of up to 2048 kbit / s (n • 64 kbit / s, where n = 1, 2 ... 32), made by multi-speed asymmetric technology so that the transmission is in the forward and reverse directions for each pair is carried out with different velocities; signal distribution medium in the form of two pairs of copper-cable lines, in cables of an existing analog communication system with frequency division of channels, free from use in an analog communication system; a circuit for analog signal processing and correction providing asymmetric information transfer for each pair and / or a line matching circuit that provides data transmission with a total data rate of up to 2048 kbit / s with a transmission range of up to 22 km in each of the regeneration sections with the aim of stage-by-stage digitalization of trunk, zonal and local copper-cable communication lines, sealed with analog equipment with frequency division of channels. 2. The system according to claim 1, characterized in that it is made with the use of regenerators suitable for installation in the premises of amplification points of existing analog communication systems with fastening on its racks in corrosion-resistant sealed enclosures, with removable equipment containing a switching field of input and output goals, with a set of linear regenerator boards, consisting of transceiver boards and a high-voltage interface board with a power supply, telecontrol, linear service communication, protection from the dangerous effects of lightning discharges dangerous and interfering with the effects of power lines, with the possibility of replacing a faulty linear regenerator or telecontrol unit, with the ability to measure the parameters of a linear cable, with the possible use of one or two remote power sources that provide power for signal pairs of up to six regenerators on each side, which allows increase the length of the communication line (with a cable with a core diameter of 0.8 mm - 1.2 mm) to 286 km without intermediate power supply points, and with the possible use of a control system transmitting and transmitting signals of telemechanics and intercom, implemented on the basis of a personal computer or video terminal.