WO2001069925A1 - Multimedia system and method for distributing radio wave and cable channels in a cable network in twisted pairs - Google Patents

Multimedia system and method for distributing radio wave and cable channels in a cable network in twisted pairs Download PDF

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Publication number
WO2001069925A1
WO2001069925A1 PCT/FR2001/000804 FR0100804W WO0169925A1 WO 2001069925 A1 WO2001069925 A1 WO 2001069925A1 FR 0100804 W FR0100804 W FR 0100804W WO 0169925 A1 WO0169925 A1 WO 0169925A1
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WO
WIPO (PCT)
Prior art keywords
balun
twisted pair
signal
coaxial cable
cable
Prior art date
Application number
PCT/FR2001/000804
Other languages
French (fr)
Inventor
Robert Kaplan
Gérard BUSCH
Original Assignee
Micsystemes S.A.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from FR0003387A external-priority patent/FR2806571A1/en
Application filed by Micsystemes S.A. filed Critical Micsystemes S.A.
Priority to AU44265/01A priority Critical patent/AU4426501A/en
Priority to EP01917171A priority patent/EP1183866A1/en
Publication of WO2001069925A1 publication Critical patent/WO2001069925A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/10—Adaptations for transmission by electrical cable
    • H04N7/108—Adaptations for transmission by electrical cable the cable being constituted by a pair of wires

Definitions

  • Multimedia system and method for distributing radio and cable channels in a cable network in twisted pairs
  • the present invention relates to a multimedia system for distributing radio channels in a cable network in twisted pairs. It also relates to a process implemented in this system.
  • the present invention finds a particularly interesting application in the field of the distribution of television channels in places such as collective or public establishments (education, hospitals, hotels).
  • Television channels can be distributed either over the air using a reception antenna installed on the roof of a hotel, for example, or by cable network (fiber optic or coaxial cable).
  • cable network fiber optic or coaxial cable
  • Optical fibers and coaxial cables are used to efficiently transmit high frequency signals such as signals from radio channels between 47 megahertz and 850 megahertz.
  • balun an impedance matching system allowing a symmetrical twisted pair cable (BALanced) to be connected to an asymmetrical coaxial cable (UNbalanced, with ground line);
  • Category 7 cable qualified for digital signals up to 700Mhz, means a shielded cable made up of four twisted pairs individually shielded to ISO SC25 / WG3. It is recalled that category 5, qualified for digital signals up to 10 GHz, relates to a shielded cable (STP) or unshielded cable (UTP), composed of four twisted pairs unshielded individually;
  • Document US 5,633,614 discloses a coupling device comprising a balun configured to convert an asymmetrical video signal on a 75 ohm impedance transmission line into a balanced signal on a 100 ohm impedance transmission line, for example a cable twisted pair, in a frequency range from 50 to 500 Mhz.
  • the object of the present invention is to provide an inexpensive distribution system based on the category 5, 6 or 7 twisted pair technology capable of carrying signals of several hundred megahertz.
  • a multimedia system for distributing high frequency signals in a cable network in twisted pairs comprising: a first impedance matching means for receiving by means of a coaxial cable a high frequency signal (HF) and transmit on a twisted pair said HF signal, comprising a passive balun balun, - a second impedance matching means for receiving the HF signal from the twisted pair and transmitting the HF signal to a given terminal by means of a coaxial cable, comprising a passive asymmetry balun, and - upstream of the symmetrical balun passive, means for amplifying the HF signal from the incoming coaxial cable.
  • a first impedance matching means for receiving by means of a coaxial cable a high frequency signal (HF) and transmit on a twisted pair said HF signal, comprising a passive balun balun, - a second impedance matching means for receiving the HF signal from the twisted pair and transmitting the HF signal to a given terminal by means of a coaxial cable, comprising a passive
  • a twisted pair connection is inserted between two coaxial cables.
  • This technical solution is particularly interesting insofar as the twisted pair is an inexpensive means of transport and generally installed in collective or private premises from the construction of these premises.
  • the balun balancer is advantageously designed to provide galvanic isolation between the incoming coaxial cable and the twisted pair. It is the same with the desymmetrizer balun which is advantageously designed to achieve galvanic isolation between the twisted pair and the outgoing coaxial cable.
  • the twisted pair can be of category 5, 6 or 7. Thanks to this twisted pair, the system makes it possible to distribute high frequency signals which are signals of hertzian and cable channels ranging between 47 megahertz and 850 megahertz, or any video module signal in this frequency band.
  • the multimedia system according to the invention may also comprise means for producing a means for producing a 90 ° phase shift between the input signals and the output signals of the balun, as well as means for noise repair.
  • this system can also include, at the output of the desymmetrizer balun, automatic gain control means to compensate for the amplification weakening of the HF signal in the twisted pair.
  • the balun balancer can advantageously include a plurality of outputs, for example eight outputs, each identical on a twisted pair as well as a ninth output to connect in cascade, by means of a coaxial cable, a second balun balancer in order to multiply the number of outputs on twisted pair.
  • the twisted pair connecting the balun symetriseur and the balun desymetriseur can be part of a set of four twisted pairs forming a connection of type RJ45.
  • a twisted pair of the RJ45 link is used for a telephone connection and two other twisted pairs of the RJ45 link can for example be used for a network link of the Internet type.
  • the impedance of coaxial cables is 75 Ohms and that of Category 5, 6 or 7 twisted pairs is 100 Ohms.
  • the present invention also relates to a method for distributing high frequency signals in a cable network in twisted pairs, in which a first impedance matching is made between a coaxial cable and a twisted pair so as to transmit a high frequency signal (HF). from the coaxial cable to the twisted pair, and a second impedance adaptation between the twisted pair and a second coaxial cable connected to a terminal, these first and second impedance adaptations being carried out respectively by a first and a second passive baluns, respectively symmetrizing and desymmetrizer, characterized in that it further comprises an amplification of the HF signal from the incoming coaxial cable, upstream of the passive symmetrizer balun.
  • a first impedance matching is made between a coaxial cable and a twisted pair so as to transmit a high frequency signal (HF).
  • HF high frequency signal
  • the second impedance matching can involve an amplification linked to an automatic gain control in order to compensate for the weakening of the HF signal in the twisted pair.
  • FIG. 1 is a simplified schematic view of the main elements included in the system according to the invention
  • FIG. 2 is a simplified electronic diagram of the first balun carrying out an amplification and a symmetrization of the high frequency signal picked up by an antenna
  • FIG. 3 is a simplified electronic diagram of the second balun performing a desymmetrization or dissymmetrization and an automatic gain control of the high frequency signal transmitted to a television set
  • FIG. 1 is a simplified schematic view of the main elements included in the system according to the invention
  • FIG. 2 is a simplified electronic diagram of the first balun carrying out an amplification and a symmetrization of the high frequency signal picked up by an antenna
  • FIG. 3 is a simplified electronic diagram of the second balun performing a desymmetrization or dissymmetrization and an automatic gain control of the high frequency signal transmitted to a television set
  • FIG. 4 is a simplified schematic view of a system for distributing television channels to a plurality of televisions;
  • Figure 5 is a simplified electronic diagram of a balun balancer having a plurality of outputs;
  • Figure 6 is a simplified schematic view of a multimedia system according to the invention integrating telephony and Ethernet;
  • FIG. 7 is a simplified electronic diagram of a particular embodiment of a system according to the invention.
  • the HF signal is transmitted to a balancing balun 3 by means of a coaxial cable 2 of impedance 75 Ohms.
  • the balun balancer 3 is arranged so that the HF signal is correctly transmitted in a twisted pair cable 4 of category 7 and of impedance 100 Ohms. To do this, the balun balancer 3 amplifies the HF signal which arrives with a very weak amplitude level, then symmetrizes the amplified HF signal.
  • Symmetrization involves moving from an unbalanced means of transport composed of a conduction line and a ground line (coaxial cable) to a balanced means of transport composed of two conduction lines (pair twisted).
  • the twisted pair 4 is connected to a desymmetrizing balun 5.
  • the desymmetrizing balun 5 makes it possible to transmit the HF signal from twisted pair 4 (balanced) to a coaxial cable 6 (asymmetrical) with automatic gain control to compensate for the amplitude loss in twisted pair 4.
  • the length of twisted pair 4 is example of a hundred meters maximum, this makes it possible to have an HF signal at the input of the desymmetrizer balun 5 whose amplitude is not irreversibly weakened.
  • two twisted pairs can be connected by means of a sub-distributor (not shown) providing amplification of the HF signal.
  • the coaxial cable 6 is finally connected to a television set 7.
  • balun 3 A simplified electronic diagram of the balun 3 is shown in Figure 2 in which are also shown the coaxial cable 2 connected to the antenna 1 and the twisted pair 4 carrying the HF signal to the desymmetrizing balun 5.
  • the main functions of the balun symmetrizers 3 are: - an amplification of the incoming HF signal; an impedance adaptation, that is to say an input impedance of 75 Ohms and an output impedance of 100 Ohms for example, the impedance values being a function of the type of cables connected to the input and to the output; and galvanic isolation between the coaxial cable 2 and the twisted pair.
  • the balun balancer 3 comprises at the input a high pass filter integrating a decoupling capacity 301 and a resistor 302.
  • the amplifier 303 makes it possible to amplify the incoming HF signal.
  • the characteristics of the amplifier 303 are for example an amplification of 20 dB between 47 megahertz and 850 megahertz.
  • the amplifier 303 then supplies a transformer 304 ensuring galvanic isolation.
  • the primary of the transformer 304 is connected to ground and has an impedance of 75 Ohms.
  • the secondary of the transformer 304 is connected in parallel to a resistor 305 with a value equal to 100 Ohms.
  • the resistance terminals 305 represent the output of the balun balancer 3 to which the wires of the twisted pair 4 are connected.
  • balun 3 The simplified electronic diagram of the balun 3 is significantly different from that of the balun 5 shown in Figure 3.
  • the twisted pair 4 and the coaxial cable 6 connected to the television 7 are also shown in Figure 3.
  • the main functions of the balun 5 are :
  • an impedance adaptation that is to say an input impedance of 100 Ohms and an output impedance of 75 Ohms for example, the impedance values being a function of the type of cables connected to the input and to the output;
  • the two wires of the twisted pair 4 are connected to the primary of a transformer 501 ensuring galvanic isolation between the twisted pair 4 and the coaxial cable 6.
  • the secondary of the transformer 501 is connected to an automatic gain control device represented by the variable gain amplifier 502, the amplifier 503 and the buffer amplifier 504.
  • the impedance matching at the output is carried out by the resistor 505 with a value of 100 Ohms. Resistor 505 is connected in series to coaxial cable 6.
  • the system comprises a first passive balun placed at the arrival of a coaxial cable and provided for balancing a frequency between 50 and 860 MHz on a twisted pair of a local network, with adaptation of the impedance to the VDI cable used and galvanic isolation.
  • a second passive balun identical but inverted with respect to the first balun, placed at the other end of the VDI cable, is provided for desymmetrizing the frequency.
  • An amplifier can be placed upstream of the first balun, to provide at the input of the VDI cable a signal of sufficient amplitude for its transport.
  • This amplifier may have power characteristics which are a function of the distance to be traveled, calibrated for example in 5-meter increments. The distances covered are between 1 and 100 meters from the arrival of the HF signal on coaxial cable and its restitution on coaxial cable at a reception station.
  • This system allows the distribution of terrestrial channels, of the cable plan, as well as of all audio-video channels remodulated within a local cable network VDI (twisted pair of category 5, 6 or 7), in a frequency band between 47 and 860 MHz.
  • VDI twisted pair of category 5, 6 or 7
  • the present invention being for example intended for the distribution of television channels in hotels, we will now describe a system for a plurality of televisions.
  • the antenna 1 delivers an HF signal to a balun balun 31 through the coaxial cable 2.
  • the balun balun 31 has eight identical outputs which are respectively connected to the eight twisted pairs 41-48 . Each twisted pair is then connected to a desymmetry balun 51 .. or 58 followed by a coaxial cable 61 ...
  • the symmetrical balun 31, playing the role of a server can be of a design identical to that of the balun 3 but with eight outputs obtained with eight secondary windings on the transformer 304. Each winding is provided in parallel with a resistance of 100 Ohms.
  • the HF signal arriving via the coaxial cable 2 is thus dispatched on the eight twisted pairs 41-48 to the eight different televisions 71-78.
  • the balun balancer 31 also has an additional output to which is connected a second balun balancer 33 by means of a coaxial cable 32. This additional output is for example the output of an amplifier connected upstream of the input capacity of the balun balun 31.
  • the balun balancer 33 is identical to the balun balancer 31 with eight outputs on eight twisted pairs 81-88 each connected in series to a balun desymetriseur 91 or 98, a coaxial cable 101 or 108 and a television 111 or 118.
  • the system thus described makes it possible to distribute television channels on sixteen televisions. The number can be increased by connecting several other symmetrical baluns following the balun baler 33.
  • balun balancer 31 comprises in addition to the balun balancer 3 seven other outputs on twisted pairs from seven other secondary windings on the transformer 304.
  • the balun balancer 31 also differs from balun balun 3 by said additional output carried upstream of the capacity 301 by means of an amplifier 313.
  • One of the characteristics of the amplifier 313 may be an amplification gain of 8 dB for example to compensate for the losses of the branch on the coaxial cable 32.
  • the twisted pair 4 is part of a set of four twisted pairs 4, 401, 402 and 403 forming a cable 400 of category 5, 6 or 7 connected to distributors 405 and 406
  • the distributors 405 and 406 make it possible to separate the four twisted pairs 4, 401, 402 and 403.
  • the twisted pair 401 is intended for telephony and the twisted pairs 402 and 403 are intended for connection to a network of Ethernet or Internet type. .
  • the distributor 405, on the one hand directs the twisted pair 4 on a connector 404 of RJ45 type inserts in the balun balancer 3, and on the other hand directs the twisted pairs 401, 402 and 403 on a connector 407 of RJ45 type connects to the telephone network switches 408 for example, by means of a link 409.
  • the distributor 406, on the one hand directs the twisted pair 401 on a connector 410 of RJ45 type inserts in the balun desymetriseur 5, and on the other hand directs the twisted pair
  • the present invention therefore makes it possible to distribute television channels on a plurality of televisions installed in a building such as a hotel inexpensively by implementing inexpensive electrical elements such as twisted pairs and active baluns.
  • the system according to the invention finds applications in the distribution of hertzian chains, the cable plan, the satellite channels, and / or any modulated source, in individual or collective pre-cabled houses, or in tertiary buildings.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

The invention concerns a multimedia system for distributing high frequency signals in a cabled network in twisted pairs. Said system comprises: first impedance adapting means for receiving through a coaxial cable a high frequency signal (HF) and transmitting over a twisted pair of category 5, 6 or 7 said HF signal; second impedance adapting means for receiving the HF signal coming from the twisted pair of category 5, 6 or 7 and transmitting the HF signal to a specific terminal through a coaxial cable. The first impedance adapting means is a passive balanced converter. The second impedance adapting means is a passive unbalanced converter with HF signal amplification and automatic gain control.

Description

"Système multimédia et procédé pour distribuer des chaînes hertziennes et câblées dans un réseau câblé en paires torsadées" "Multimedia system and method for distributing radio and cable channels in a cable network in twisted pairs"
La présente invention concerne un système multimédia de distribution de chaînes hertziennes dans un réseau câblé en paires torsadées. Elle vise également un procédé mis en œuvre dans ce système. La présente invention trouve une application particulièrement intéressante dans le domaine de la distribution de chaînes de télévision dans des lieux tels que les établissements collectifs ou publics (enseignement, hôpitaux, hôtellerie) . Une distribution de chaînes de télévision peut être effectuée soit par voie hertzienne au moyen d'une antenne de réception installée sur le toit d'un hôtel par exemple, soit par réseau câblé (fibre optique ou câble coaxial) . Il existe actuellement des systèmes de distribution de chaînes de télévision mettant en œuvre les techniques de transmission large bande et utilisant par exemple des réseaux câblés en fibre optique ou en câble coaxial. Les fibres optiques et les câbles coaxiaux permettent de transmettre efficacement des signaux hautes fréquences tels que les signaux des chaînes hertziennes comprises entre 47 mégahertz et 850 mégahertz.The present invention relates to a multimedia system for distributing radio channels in a cable network in twisted pairs. It also relates to a process implemented in this system. The present invention finds a particularly interesting application in the field of the distribution of television channels in places such as collective or public establishments (education, hospitals, hotels). Television channels can be distributed either over the air using a reception antenna installed on the roof of a hotel, for example, or by cable network (fiber optic or coaxial cable). There are currently television channel distribution systems implementing broadband transmission techniques and using, for example, fiber optic cable or coaxial cable networks. Optical fibers and coaxial cables are used to efficiently transmit high frequency signals such as signals from radio channels between 47 megahertz and 850 megahertz.
On connaît, par le présent déposant, des systèmes de distribution de signaux vidéos dans lesquels un signal haute fréquence peut être véhiculé par une paire torsadée catégorie 5 depuis un serveur central jusqu'à une pluralité de postes de télévision. La paire torsadée a la particularité de coûter moins cher que la fibre optique. En outre les réseaux de paires torsadées sont généralement pré-installés dès la construction des bâtiments tertiaires. Cependant de tels systèmes nécessitent une démodulation du signal haute fréquence en signal en bande de base véhiculé par la paire torsadée puis une symétrisation du signal en bande de base pour alimenter le poste de télévision. Ce système est onéreux du fait de l'investissement sur des dispositifs tel qu'une matrice de commutation. Dans la suite, par balun, on entend un système d' adaptation d' impédance permettant de raccorder un câble à paires torsadées symétrique (BALanced) à un câble coaxial dissymétrique (UNbalanced, avec ligne de masse) ; par câble de catégorie 7, qualifiée pour des signaux numériques jusqu'à 700Mhz, on entend un câble blindé composé de quatre paires torsadées blindées individuellement à la norme ISO SC25/WG3. On rappelle que la catégorie 5, qualifiée pour des signaux numériques jusqu'à lOOMhz, concerne un câble blindé (STP) ou non blindé (UTP) , composé de quatre paires torsadées non blindées individuellement; la catégorie 6, qualifiée pour des signaux numériques jusqu'à 250Mhz, concerne un câble blindé composé de quatre paires torsadées blindées par groupe de deux, ou individuellement.There are known, by the present applicant, video signal distribution systems in which a high frequency signal can be conveyed by a category 5 twisted pair from a central server to a plurality of television sets. The twisted pair has the distinction of being cheaper than optical fiber. In addition, networks of twisted pairs are generally pre-installed when the tertiary buildings are constructed. However, such systems require demodulation of the high frequency signal into a baseband signal carried by the pair. twisted then a symmetrization of the signal in baseband to feed the television set. This system is expensive due to the investment in devices such as a switching matrix. In the following, by balun is meant an impedance matching system allowing a symmetrical twisted pair cable (BALanced) to be connected to an asymmetrical coaxial cable (UNbalanced, with ground line); Category 7 cable, qualified for digital signals up to 700Mhz, means a shielded cable made up of four twisted pairs individually shielded to ISO SC25 / WG3. It is recalled that category 5, qualified for digital signals up to 10 GHz, relates to a shielded cable (STP) or unshielded cable (UTP), composed of four twisted pairs unshielded individually; Category 6, qualified for digital signals up to 250 MHz, concerns a screened cable made up of four screened twisted pairs in groups of two, or individually.
Le document US 5 633 614 divulgue un dispositif de couplage comprenant un balun configuré pour convertir un signal vidéo dissymétrique sur une ligne de transmission d' impédance 75 ohms en un signal symétrique sur une ligne de transmission d'impédance 100 ohms, par exemple un câble à paires torsadées, dans une gamme de fréquence de 50 à 500 Mhz. La présente invention a pour objectif de réaliser un système de distribution peu onéreux basé sur la technologie des paires torsadées de catégorie 5, 6 ou 7 pouvant véhiculer des signaux de plusieurs centaines de mégahertz.Document US 5,633,614 discloses a coupling device comprising a balun configured to convert an asymmetrical video signal on a 75 ohm impedance transmission line into a balanced signal on a 100 ohm impedance transmission line, for example a cable twisted pair, in a frequency range from 50 to 500 Mhz. The object of the present invention is to provide an inexpensive distribution system based on the category 5, 6 or 7 twisted pair technology capable of carrying signals of several hundred megahertz.
L'objectif ci-dessus est atteint avec un système multimédia de distribution de signaux hautes fréquences dans un réseau câblé en paires torsadées, comprenant : un premier moyen d' adaptation d' impédance pour recevoir au moyen d'un câble coaxial un signal haute fréquence (HF) et transmettre sur une paire torsadée ledit signal HF, comprenant un balun symétriseur passif, - un second moyen d' adaptation d' impédance pour recevoir le signal HF venant de la paire torsadée et transmettre le signal HF vers un terminal donne au moyen d'un câble coaxial, comprenant un balun desymetriseur passif, et - en amont du balun symetriseur passif, des moyens pour amplifier le signal HF issu du câble coaxial entrant.The above objective is achieved with a multimedia system for distributing high frequency signals in a cable network in twisted pairs, comprising: a first impedance matching means for receiving by means of a coaxial cable a high frequency signal (HF) and transmit on a twisted pair said HF signal, comprising a passive balun balun, - a second impedance matching means for receiving the HF signal from the twisted pair and transmitting the HF signal to a given terminal by means of a coaxial cable, comprising a passive asymmetry balun, and - upstream of the symmetrical balun passive, means for amplifying the HF signal from the incoming coaxial cable.
En d'autres termes, on intercale une liaison en paire torsadée entre deux câbles coaxiaux. Cette solution technique est particulièrement intéressante dans la mesure ou la paire torsadée est un moyen de transport peu onéreux et généralement implante dans les locaux collectifs ou prives des la construction de ces locaux.In other words, a twisted pair connection is inserted between two coaxial cables. This technical solution is particularly interesting insofar as the twisted pair is an inexpensive means of transport and generally installed in collective or private premises from the construction of these premises.
Le balun symetriseur est avantageusement conçu pour réaliser un isolement galvanique entre le câble coaxial entrant et la paire torsadée. Il en est de même avec le balun desymetriseur qui est avantageusement conçu pour réaliser un isolement galvanique entre la paire torsadée et le câble coaxial sortant.The balun balancer is advantageously designed to provide galvanic isolation between the incoming coaxial cable and the twisted pair. It is the same with the desymmetrizer balun which is advantageously designed to achieve galvanic isolation between the twisted pair and the outgoing coaxial cable.
La paire torsadée peut être de catégorie 5, 6 ou 7. Grâce a cette paire torsadée, le système permet de distribuer des signaux hautes fréquences qui sont des signaux de chaînes hertziennes et câblées compris entre 47 mégahertz et 850 mégahertz, ou tout signal video module dans cette bande de fréquence . Le système multimédia selon l'invention peut en outre comprendre des moyens pour réaliser un moyen pour réaliser un déphasage de 90° entre les signaux d'entrée et les signaux de sortie du balun symetriseur, ainsi que des moyen de réfection de bruit. Par ailleurs, ce système peut aussi comprendre, en sortie du balun desymetriseur, des moyens de contrôle automatique de gain pour compenser l'affaiblissement d'amplitude du signal HF dans la paire torsadée.The twisted pair can be of category 5, 6 or 7. Thanks to this twisted pair, the system makes it possible to distribute high frequency signals which are signals of hertzian and cable channels ranging between 47 megahertz and 850 megahertz, or any video module signal in this frequency band. The multimedia system according to the invention may also comprise means for producing a means for producing a 90 ° phase shift between the input signals and the output signals of the balun, as well as means for noise repair. Furthermore, this system can also include, at the output of the desymmetrizer balun, automatic gain control means to compensate for the amplification weakening of the HF signal in the twisted pair.
Le balun symetriseur peut avantageusement comprendre une pluralité de sorties, par exemple huit sorties, identiques chacune sur une paire torsadée ainsi qu'une neuvième sortie pour connecter en cascade, au moyen d'un câble coaxial, un second balun symetriseur afin de multiplier le nombre de sorties sur paire torsadée.The balun balancer can advantageously include a plurality of outputs, for example eight outputs, each identical on a twisted pair as well as a ninth output to connect in cascade, by means of a coaxial cable, a second balun balancer in order to multiply the number of outputs on twisted pair.
La paire torsadée reliant le balun symetriseur et le balun desymetriseur peut faire partie d'un ensemble de quatre paires torsadées formant une liaison de type RJ45. Une paire torsadée de la liaison RJ45 est utilisée pour une connexion téléphonique et deux autres paires torsadées de la liaison RJ45 peuvent par exemple être utilisées pour une liaison en réseau de type Internet.The twisted pair connecting the balun symetriseur and the balun desymetriseur can be part of a set of four twisted pairs forming a connection of type RJ45. A twisted pair of the RJ45 link is used for a telephone connection and two other twisted pairs of the RJ45 link can for example be used for a network link of the Internet type.
D'une façon générale, l'impédance des câbles coaxiaux est de 75 Ohms et celle des paires torsadées de catégorie 5, 6 ou 7 est de 100 Ohms.Generally, the impedance of coaxial cables is 75 Ohms and that of Category 5, 6 or 7 twisted pairs is 100 Ohms.
La présente invention concerne également un procédé de distribution de signaux hautes fréquences dans un réseau câblé en paires torsadées, dans lequel on réalise une première adaptation d' impédance entre un câble coaxial et une paire torsadée de façon à transmettre un signal haute fréquence (HF) du câble coaxial vers la paire torsadée, et une seconde adaptation d' impédance entre la paire torsadée et un second câble coaxial relié à un terminal, ces première et seconde adaptations d' impédance étant réalisées respectivement par un premier et un second baluns passifs respectivement symetriseur et desymetriseur, caractérisé en ce qu'il comprend en outre une amplification du signal HF issu du câble coaxial entrant, en amont du balun symetriseur passif.The present invention also relates to a method for distributing high frequency signals in a cable network in twisted pairs, in which a first impedance matching is made between a coaxial cable and a twisted pair so as to transmit a high frequency signal (HF). from the coaxial cable to the twisted pair, and a second impedance adaptation between the twisted pair and a second coaxial cable connected to a terminal, these first and second impedance adaptations being carried out respectively by a first and a second passive baluns, respectively symmetrizing and desymmetrizer, characterized in that it further comprises an amplification of the HF signal from the incoming coaxial cable, upstream of the passive symmetrizer balun.
La seconde adaptation d' impédance peut faire intervenir une amplification liée à un contrôle automatique de gain afin de compenser l'affaiblissement du signal HF dans la paire torsadée.The second impedance matching can involve an amplification linked to an automatic gain control in order to compensate for the weakening of the HF signal in the twisted pair.
D'autres avantages et caractéristiques de l'invention apparaîtront à l'examen de la description détaillée d'un mode de mise en œuvre nullement limitatif, et des dessins annexés, sur lesquels : - la figure 1 est une vue schématique simplifiée des principaux éléments compris dans le système selon l' invention ; la figure 2 est un schéma électronique simplifié du premier balun réalisant une amplification et une symétrisation du signal haute fréquence capté par une antenne ; la figure 3 est un schéma électronique simplifié du second balun réalisant une désymétrisation ou dissymétrisation et un contrôle automatique de gain du signal haute fréquence transmis vers un téléviseur ; la figure 4 est une vue schématique simplifiée d'un système de distribution de chaînes de télévision vers une pluralité de téléviseurs ; la figure 5 est un schéma électronique simplifié d'un balun symetriseur comportant une pluralité de sorties ; la figure 6 est une vue schématique simplifiée d'un système multimédia selon l'invention intégrant la téléphonie et l'Ethernet ; et la figure 7 est un schéma électronique simplifié d'un mode particulier de réalisation d'un système selon l'invention.Other advantages and characteristics of the invention will appear on examining the detailed description of a mode of implementation which is in no way limitative, and the attached drawings, in which: - Figure 1 is a simplified schematic view of the main elements included in the system according to the invention; FIG. 2 is a simplified electronic diagram of the first balun carrying out an amplification and a symmetrization of the high frequency signal picked up by an antenna; FIG. 3 is a simplified electronic diagram of the second balun performing a desymmetrization or dissymmetrization and an automatic gain control of the high frequency signal transmitted to a television set; FIG. 4 is a simplified schematic view of a system for distributing television channels to a plurality of televisions; Figure 5 is a simplified electronic diagram of a balun balancer having a plurality of outputs; Figure 6 is a simplified schematic view of a multimedia system according to the invention integrating telephony and Ethernet; and FIG. 7 is a simplified electronic diagram of a particular embodiment of a system according to the invention.
Sur la figure 1, on voit une antenne 1 de réception de chaînes hertziennes capable de capter un signal haute fréquence compris entre 47 mégahertz et 850 mégahertz. Le signal HF est transmis vers un balun symetriseur 3 au moyen d'un câble coaxial 2 d'impédance 75 Ohms. Le balun symetriseur 3 est agencé de sorte que le signal HF est correctement transmis dans un câble à paire torsadée 4 de catégorie 7 et d'impédance 100 Ohms. Pour ce faire le balun symetriseur 3 amplifie le signal HF qui arrive avec un niveau d'amplitude très affaibli, puis symétrise le signal HF amplifié. La symétrisation consiste à passer d'un moyen de transport dissymétrique (unbalanced) composé d'une ligne de conduction et d'une ligne de masse (câble coaxial) à un moyen de transport symétrique (balanced) composé de deux lignes de conduction (paire torsadée) . La paire torsadée 4 est connectée à un balun desymetriseur 5. Le balun desymetriseur 5 permet de transmettre le signal HF venant de la paire torsadée 4 (symétrique) vers un câble coaxial 6 (dissymétrique) avec un contrôle automatique de gain pour compenser l'affaiblissement d'amplitude dans la paire torsadée 4. La longueur de la paire torsadée 4 est par exemple de cent mètres maximum, ceci permet d'avoir a l'entrée du balun desymetriseur 5 un signal HF dont l'amplitude n'est pas affaiblie de façon irréversible. Cependant, pour augmenter la longueur de la paire torsadée, on peut connecter deux paires torsadées au moyen d'un sous répartiteur (non représente) réalisant une amplification d'amplitude du signal HF. Le câble coaxial 6 est finalement relie a un poste de télévision 7.In Figure 1, we see an antenna 1 for receiving radio channels capable of picking up a high frequency signal between 47 megahertz and 850 megahertz. The HF signal is transmitted to a balancing balun 3 by means of a coaxial cable 2 of impedance 75 Ohms. The balun balancer 3 is arranged so that the HF signal is correctly transmitted in a twisted pair cable 4 of category 7 and of impedance 100 Ohms. To do this, the balun balancer 3 amplifies the HF signal which arrives with a very weak amplitude level, then symmetrizes the amplified HF signal. Symmetrization involves moving from an unbalanced means of transport composed of a conduction line and a ground line (coaxial cable) to a balanced means of transport composed of two conduction lines (pair twisted). The twisted pair 4 is connected to a desymmetrizing balun 5. The desymmetrizing balun 5 makes it possible to transmit the HF signal from twisted pair 4 (balanced) to a coaxial cable 6 (asymmetrical) with automatic gain control to compensate for the amplitude loss in twisted pair 4. The length of twisted pair 4 is example of a hundred meters maximum, this makes it possible to have an HF signal at the input of the desymmetrizer balun 5 whose amplitude is not irreversibly weakened. However, to increase the length of the twisted pair, two twisted pairs can be connected by means of a sub-distributor (not shown) providing amplification of the HF signal. The coaxial cable 6 is finally connected to a television set 7.
Un schéma électronique simplifie du balun symetriseur 3 est représente sur la figure 2 sur laquelle sont également représentes le câble coaxial 2 relie a l'antenne 1 et la paire torsadée 4 transportant le signal HF jusqu'au balun desymetriseur 5. Les principales fonctions du balun symetriseur 3 sont : - une amplification du signal HF entrant ; - une adaptation d'impédance, c'est-a-dire une impédance d'entrée de 75 Ohms et une impédance de sortie de 100 Ohms par exemple, les valeurs d' impédance étant fonction de type de câbles connectes a l'entrée et a la sortie; et une isolation galvanique entre le câble coaxial 2 et la paire torsadée .A simplified electronic diagram of the balun 3 is shown in Figure 2 in which are also shown the coaxial cable 2 connected to the antenna 1 and the twisted pair 4 carrying the HF signal to the desymmetrizing balun 5. The main functions of the balun symmetrizers 3 are: - an amplification of the incoming HF signal; an impedance adaptation, that is to say an input impedance of 75 Ohms and an output impedance of 100 Ohms for example, the impedance values being a function of the type of cables connected to the input and to the output; and galvanic isolation between the coaxial cable 2 and the twisted pair.
Le balun symetriseur 3 comporte en entrée un filtre passe haut intégrant une capacité de découplage 301 et une résistance 302. L'amplificateur 303 permet d'amplifier le signal HF entrant. Les caractéristiques de l'amplificateur 303 sont par exemple une amplification de 20 dB entre 47 mégahertz et 850 mégahertz. L'amplificateur 303 alimente ensuite un transformateur 304 assurant l' isolation galvanique Le primaire du transformateur 304 est connecte a la masse et présente une impédance de 75 Ohms. Le secondaire du transformateur 304 est connecte en parallèle a une résistance 305 de valeur égale a 100 Ohms. Les bornes de la résistance 305 représentent la sortie du balun symetriseur 3 sur lesquelles sont connectés les fils de la paire torsadée 4.The balun balancer 3 comprises at the input a high pass filter integrating a decoupling capacity 301 and a resistor 302. The amplifier 303 makes it possible to amplify the incoming HF signal. The characteristics of the amplifier 303 are for example an amplification of 20 dB between 47 megahertz and 850 megahertz. The amplifier 303 then supplies a transformer 304 ensuring galvanic isolation. The primary of the transformer 304 is connected to ground and has an impedance of 75 Ohms. The secondary of the transformer 304 is connected in parallel to a resistor 305 with a value equal to 100 Ohms. The resistance terminals 305 represent the output of the balun balancer 3 to which the wires of the twisted pair 4 are connected.
Le schéma électronique simplifié du balun symetriseur 3 diffère significativement de celui du balun desymetriseur 5 représenté sur la figure 3. La paire torsadée 4 et le câble coaxial 6 relié au téléviseur 7 sont également représentés sur la figure 3. Les principales fonction du balun desymetriseur 5 sont :The simplified electronic diagram of the balun 3 is significantly different from that of the balun 5 shown in Figure 3. The twisted pair 4 and the coaxial cable 6 connected to the television 7 are also shown in Figure 3. The main functions of the balun 5 are :
- un contrôle automatique de gain pour amplifier de façon contrôlée l'amplitude du signal HF arrivant par la paire torsadée 4 ;- an automatic gain control to amplify in a controlled manner the amplitude of the HF signal arriving by the twisted pair 4;
- une adaptation d'impédance, c'est-à-dire une impédance d'entrée de 100 Ohms et une impédance de sortie de 75 Ohms par exemple, les valeurs d'impédance étant fonction de type de câbles connectés à l'entrée et à la sortie; etan impedance adaptation, that is to say an input impedance of 100 Ohms and an output impedance of 75 Ohms for example, the impedance values being a function of the type of cables connected to the input and to the output; and
- une isolation galvanique entre la paire torsadée 4 et le câble coaxial 6.- galvanic isolation between the twisted pair 4 and the coaxial cable 6.
Les deux fils de la paire torsadée 4 sont reliés au primaire d'un transformateur 501 assurant l'isolation galvanique entre la paire torsadée 4 et le câble coaxial 6. Le secondaire du transformateur 501 est connecté à un dispositif de contrôle automatique de gain représenté par l'amplificateur à gain variable 502, l'amplificateur 503 et l'amplificateur tampon 504. L'adaptation d'impédance en sortie est réalisée par la résistance 505 d'une valeur de 100 Ohms. La résistance 505 est connectée en série au câble coaxial 6.The two wires of the twisted pair 4 are connected to the primary of a transformer 501 ensuring galvanic isolation between the twisted pair 4 and the coaxial cable 6. The secondary of the transformer 501 is connected to an automatic gain control device represented by the variable gain amplifier 502, the amplifier 503 and the buffer amplifier 504. The impedance matching at the output is carried out by the resistor 505 with a value of 100 Ohms. Resistor 505 is connected in series to coaxial cable 6.
Dans un autre mode particulier de réalisation d'un système de distribution selon l'invention illustré par la figure 7, le système comprend un premier balun passif placé à l'arrivée d'un câble coaxial et prévu pour symétriser une fréquence comprise entre 50 et 860 MHz sur une paire torsadée d'un réseau local, avec adaptation de l'impédance au câble V.D.I. utilisé et isolation galvanique.In another particular embodiment of a distribution system according to the invention illustrated in FIG. 7, the system comprises a first passive balun placed at the arrival of a coaxial cable and provided for balancing a frequency between 50 and 860 MHz on a twisted pair of a local network, with adaptation of the impedance to the VDI cable used and galvanic isolation.
Un second balun passif, identique mais inversé par rapport au premier balun, placé à l'autre extrémité du câble V.D.I. , est prévu pour désymétriser la fréquence. Un amplificateur peut être placé en amont du premier balun, pour fournir en entrée du câble V.D.I. un signal d'amplitude suffisante pour son transport. Cet amplificateur peut présenter des caractéristiques de puissance qui sont fonction de la distance à parcourir, calibrées par exemple par tranches de 5 mètres. Les distances couvertes sont comprises entre 1 et 100 mètres à partir de l'arrivée du signal HF sur câble coaxial et sa restitution sur câble coaxial à un poste de réception. Ce système permet la distribution des chaînes hertziennes, du plan câble, ainsi que de tous canaux audio- video remodulés au sein d'un reseau local câblé V.D.I. (paire torsadée de catégorie 5, 6 ou 7), dans une bande de fréquences comprise entre 47 et 860 MHz. La présente invention étant par exemple destinée à la distribution de chaînes de télévision dans des hôtels, on va maintenant décrire un système pour une pluralité de téléviseurs. Dans un tel système, conformément à la figure 4, l'antenne 1 délivre un signal HF à un balun symetriseur 31 à travers le câble coaxial 2. Le balun symetriseur 31 comporte huit sorties identiques qui sont respectivement connectées aux huit paires torsadées 41-48. Chaque paire torsadée est ensuite connectée a un balun desymetriseur 51.. ou 58 suivi d'un câble coaxial 61...ou 68 et d'un téléviseur 71..ou 78. Le balun symetriseur 31, jouant le rôle d'un serveur, peut être d'une conception identique a celle du balun 3 mais avec huit sorties obtenues avec huit enroulements secondaires sur le transformateur 304. Chaque enroulement est doté en parallèle d'une résistance de 100 Ohms. Le signal HF arrivant par le câble coaxial 2 est ainsi dispatché sur les huit paires torsadées 41-48 vers les huit téléviseurs 71-78 différents. Le balun symetriseur 31 comporte également une sortie supplémentaire sur laquelle est connecte un second balun symetriseur 33 au moyen d'un câble coaxial 32. Cette sortie supplémentaire est par exemple la sortie d'un amplificateur connecte en amont de la capacité d' entrée du balun symetriseur 31. Le balun symetriseur 33 est identique au balun symetriseur 31 avec huit sorties sur huit paires torsadées 81-88 chacune connectée en série a un balun desymetriseur 91 ou 98, a un câble coaxial 101 ou 108 et a un téléviseur 111 ou 118. Le système ainsi décrit permet de distribuer les chaînes de télévision sur seize téléviseurs. On peut augmenter le nombre en connectant plusieurs autres baluns symétriques a la suite du balun symetriseur 33.A second passive balun, identical but inverted with respect to the first balun, placed at the other end of the VDI cable, is provided for desymmetrizing the frequency. An amplifier can be placed upstream of the first balun, to provide at the input of the VDI cable a signal of sufficient amplitude for its transport. This amplifier may have power characteristics which are a function of the distance to be traveled, calibrated for example in 5-meter increments. The distances covered are between 1 and 100 meters from the arrival of the HF signal on coaxial cable and its restitution on coaxial cable at a reception station. This system allows the distribution of terrestrial channels, of the cable plan, as well as of all audio-video channels remodulated within a local cable network VDI (twisted pair of category 5, 6 or 7), in a frequency band between 47 and 860 MHz. The present invention being for example intended for the distribution of television channels in hotels, we will now describe a system for a plurality of televisions. In such a system, in accordance with FIG. 4, the antenna 1 delivers an HF signal to a balun balun 31 through the coaxial cable 2. The balun balun 31 has eight identical outputs which are respectively connected to the eight twisted pairs 41-48 . Each twisted pair is then connected to a desymmetry balun 51 .. or 58 followed by a coaxial cable 61 ... or 68 and a television 71..or 78. The symmetrical balun 31, playing the role of a server , can be of a design identical to that of the balun 3 but with eight outputs obtained with eight secondary windings on the transformer 304. Each winding is provided in parallel with a resistance of 100 Ohms. The HF signal arriving via the coaxial cable 2 is thus dispatched on the eight twisted pairs 41-48 to the eight different televisions 71-78. The balun balancer 31 also has an additional output to which is connected a second balun balancer 33 by means of a coaxial cable 32. This additional output is for example the output of an amplifier connected upstream of the input capacity of the balun balun 31. The balun balancer 33 is identical to the balun balancer 31 with eight outputs on eight twisted pairs 81-88 each connected in series to a balun desymetriseur 91 or 98, a coaxial cable 101 or 108 and a television 111 or 118. The system thus described makes it possible to distribute television channels on sixteen televisions. The number can be increased by connecting several other symmetrical baluns following the balun baler 33.
Sur la figure 5 on peut voir le schéma électronique simplifie du balun symetriseur 31. Les éléments identiques avec le balun symetriseur 3 sont représentes avec les mêmes références. Le balun symetriseur 31 comporte donc en plus du balun symetriseur 3 sept autres sorties sur paires torsadées a partir de sept autres enroulements secondaires sur le transformateur 304. Le balun symetriseur 31 diffère également du balun symetriseur 3 par ladite sortie supplémentaire réalisée en amont de la capacité 301 au moyen d'un amplificateur 313. Une des caractéristiques de l' amplificateur 313 peut être un gain d'amplification de 8 dB par exemple pour compenser les pertes de la dérivation sur le câble coaxial 32.In Figure 5 we can see the simplified electronic diagram of the balun balancer 31. The identical elements with the balun balancer 3 are shown with the same references. The balun balancer 31 therefore comprises in addition to the balun balancer 3 seven other outputs on twisted pairs from seven other secondary windings on the transformer 304. The balun balancer 31 also differs from balun balun 3 by said additional output carried upstream of the capacity 301 by means of an amplifier 313. One of the characteristics of the amplifier 313 may be an amplification gain of 8 dB for example to compensate for the losses of the branch on the coaxial cable 32.
Un autre avantage d'un tel dispositif est la simplification de câblage aussi bien dans les locaux collectifs ou prives que dans le domaine de la domotique. En se référant a la figure 6, on voit que la paire torsadée 4 fait partie d'un ensemble de quatre paires torsadées 4, 401, 402 et 403 formant un câble 400 de catégorie 5, 6 ou 7 relie a des répartiteurs 405 et 406. Les répartiteurs 405 et 406 permettent de séparer les quatre paires torsadées 4, 401, 402 et 403. La paire torsadée 401 est destinée a la téléphonie et les paires torsadées 402 et 403 sont destinées a la connexion a un reseau de type Ethernet ou Internet. Le répartiteur 405, d'une part dirige la paire torsadée 4 sur un connecteur 404 de type RJ45 insère dans le balun symetriseur 3, et d'une autre part dirige les paires torsadées 401, 402 et 403 sur un connecteur 407 de type RJ45 relie au reseau téléphonique commute 408 par exemple, au moyen d'une liaison 409. Le répartiteur 406, d'une part dirige la paire torsadée 401 sur un connecteur 410 de type RJ45 insère dans le balun desymetriseur 5, et d'une autre part dirige la paire torsadéeAnother advantage of such a device is the simplification of wiring both in collective or private premises as in the field of home automation. Referring to Figure 6, we see that the twisted pair 4 is part of a set of four twisted pairs 4, 401, 402 and 403 forming a cable 400 of category 5, 6 or 7 connected to distributors 405 and 406 The distributors 405 and 406 make it possible to separate the four twisted pairs 4, 401, 402 and 403. The twisted pair 401 is intended for telephony and the twisted pairs 402 and 403 are intended for connection to a network of Ethernet or Internet type. . The distributor 405, on the one hand directs the twisted pair 4 on a connector 404 of RJ45 type inserts in the balun balancer 3, and on the other hand directs the twisted pairs 401, 402 and 403 on a connector 407 of RJ45 type connects to the telephone network switches 408 for example, by means of a link 409. The distributor 406, on the one hand directs the twisted pair 401 on a connector 410 of RJ45 type inserts in the balun desymetriseur 5, and on the other hand directs the twisted pair
401 sur un connecteur 411 de type RJ45 relie a un téléphone 413 et les paires torsadées 402 et 403 sur un connecteur 412 de type RJ45 relie a un micro ordinateur 414.401 on a connector 411 of RJ45 type connected to a telephone 413 and the twisted pairs 402 and 403 on a connector 412 of RJ45 type connected to a microcomputer 414.
La présente invention permet donc de distribuer des chaînes de télévision sur une pluralité de téléviseurs installes dans un bâtiment tel qu'un hôtel de manière peu onéreux en mettant en œuvre des éléments électriques peu coûteux tels que des paires torsadées et des baluns actifs.The present invention therefore makes it possible to distribute television channels on a plurality of televisions installed in a building such as a hotel inexpensively by implementing inexpensive electrical elements such as twisted pairs and active baluns.
On peut avantageusement utiliser les quatre paires torsadées de catégorie 5, 6 ou 7 de type RJ45 pour optimiser le câblage dans un local collectif ou prive, ou dans une maison individuelle. On intègre ainsi dans un câble a quatre paires torsadées la téléphonie, l'Ethernet et la distribution de chaînes hertziennes.One can advantageously use the four twisted pairs of category 5, 6 or 7 of RJ45 type to optimize the wiring in a collective or private room, or in a single house. Telephony, Ethernet and the distribution of radio channels are thus integrated into a cable with four twisted pairs.
Le système selon l'invention trouve des applications dans la distribution des chaînes hertziennes, du plan câble, des chaînes satellites, et/ou de toute source modulée, dans les maisons individuelles ou collectives pre-câblees, ou encore dans les immeubles tertiaires.The system according to the invention finds applications in the distribution of hertzian chains, the cable plan, the satellite channels, and / or any modulated source, in individual or collective pre-cabled houses, or in tertiary buildings.
Bien sûr, l'invention n'est pas limitée aux exemples qui viennent d'être décrits et de nombreux aménagements peuvent être apportes a ces exemples sans sortir du cadre deOf course, the invention is not limited to the examples which have just been described and numerous modifications can be made to these examples without departing from the scope of
1 ' invention . 1 invention.

Claims

REVENDICATIONS
1. Système multimédia de distribution de signaux hautes fréquences dans un réseau câblé en paires torsadées, comprenant :1. Multimedia system for the distribution of high frequency signals in a cable network in twisted pairs, comprising:
- un premier moyen d' adaptation d' impédance pour recevoir au moyen d'un câble coaxial un signal haute fréquence (HF) et transmettre sur une paire torsadée ledit signal HF ; comprenant un balun symetriseur passif et - un second moyen d'adaptation d'impédance pour recevoir le signal HF venant de la paire torsadée et transmettre le signal HF vers un terminal donné au moyen d'un câble coaxial, comprenant un balun desymetriseur passif, caractérisé en ce qu'il comprend en outre, en amont du balun symetriseur passif, des moyens pour amplifier le signal HF issu du câble coaxial entrant.- a first impedance matching means for receiving by means of a coaxial cable a high frequency (HF) signal and transmitting said twisted pair signal over a twisted pair; comprising a passive symmetrizing balun and - a second impedance matching means for receiving the HF signal from the twisted pair and transmitting the HF signal to a given terminal by means of a coaxial cable, comprising a passive desymmetrizing balun, characterized in that it further comprises, upstream of the passive balancing balun, means for amplifying the HF signal from the incoming coaxial cable.
2. Système selon la revendication 1, caractérisé en ce que le balun symetriseur est conçu pour réaliser un isolement galvanique entre le câble coaxial entrant et la paire torsadée .2. System according to claim 1, characterized in that the balun balancer is designed to achieve galvanic isolation between the incoming coaxial cable and the twisted pair.
3. Système selon l'une des revendications précédentes, caractérisé en ce que le balun desymetriseur est conçu pour réaliser un isolement galvanique entre la paire torsadée et le câble coaxial sortant.3. System according to one of the preceding claims, characterized in that the desymmetrizing balun is designed to provide galvanic isolation between the twisted pair and the outgoing coaxial cable.
4. Système selon l'une des revendications précédentes, caractérisé en ce qu'il comprend en outre des moyens pour réaliser un moyen pour réaliser un déphasage de 90° entre les signaux d' entrée et les signaux de sortie du balun symetriseur .4. System according to one of the preceding claims, characterized in that it further comprises means for producing a means for producing a 90 ° phase shift between the input signals and the output signals of the balun.
5. Système selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comprend, au niveau du balun symetriseur, des moyen de réjection de bruit. 5. System according to any one of the preceding claims, characterized in that it comprises, at the balun balancer, noise rejection means.
6. Système selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comprend en outre, en sortie du balun desymetriseur, des moyen de contrôle automatique de gain pour compenser l'affaiblissement d'amplitude du signal HF dans la paire torsadée.6. System according to any one of the preceding claims, characterized in that it further comprises, at the output of the desymmetrizer balun, automatic gain control means to compensate for the weakening of amplitude of the HF signal in the twisted pair .
7. Système selon l'une quelconque des revendications précédentes, caractérisé en ce que le balun symetriseur comprend huit sorties identiques chacune sur une paire torsadée ainsi qu'une neuvième sortie pour connecter en cascade, au moyen d'un câble coaxial, un second balun symetriseur afin de multiplier le nombre de sorties sur paire torsadée .7. System according to any one of the preceding claims, characterized in that the balancing balun comprises eight identical outputs each on a twisted pair as well as a ninth output for connecting in cascade, by means of a coaxial cable, a second balun balancer to multiply the number of twisted pair outputs.
8. Système selon l'une quelconque des revendications précédentes, caractérisé en ce que la paire torsadée reliant le balun symetriseur et le balun desymetriseur fait partie d'un ensemble de quatre paires torsadées formant une liaison de type RJ45.8. System according to any one of the preceding claims, characterized in that the twisted pair connecting the balun symetriseur and the desymetriseur balun is part of a set of four twisted pairs forming a connection of RJ45 type.
9. Système selon la revendication 8, caractérisé en ce qu'une paire torsadée de la liaison RJ45 est utilisée pour une connexion téléphonique et deux autres paires torsadées de la liaison RJ45 sont utilisées pour une liaison en réseau de type Internet .9. System according to claim 8, characterized in that a twisted pair of the RJ45 link is used for a telephone connection and two other twisted pairs of the RJ45 link are used for a network connection of the Internet type.
10. Système multimédia selon l'une des revendications précédentes, caractérisé en ce que les signaux hautes fréquences sont des signaux de chaînes hertziennes et câblées compris entre 47 MHz et 860 MHz.10. Multimedia system according to one of the preceding claims, characterized in that the high frequency signals are signals from radio and cable channels between 47 MHz and 860 MHz.
11. Procédé de distribution de signaux hautes fréquences dans un réseau câblé en paires torsadées, dans lequel on réalise une première adaptation d' impédance entre un câble coaxial et une paire torsadée de façon à transmettre un signal haute fréquence (HF) du câble coaxial vers la paire torsadée, et une seconde adaptation d' impédance entre la paire torsadée et un second câble coaxial relie a un terminal, ces première et seconde adaptations d' impédance étant réalisées respectivement par un premier et un second baluns passifs respectivement symetriseur et desymetriseur, caractérise en ce qu' il comprend en outre une amplification du signal HF issu du câble coaxial entrant, en amont du balun symetriseur passif.11. Method for distributing high frequency signals in a cable network in twisted pairs, in which a first impedance adaptation is made between a coaxial cable and a twisted pair so as to transmit a high signal frequency (HF) of the coaxial cable to the twisted pair, and a second impedance adaptation between the twisted pair and a second coaxial cable connected to a terminal, these first and second impedance adaptations being carried out respectively by a first and a second passive baluns, respectively symmetrizing and desymmetrizing, characterized in that it further comprises an amplification of the HF signal coming from the incoming coaxial cable, upstream of the passive baluning balun.
12. Procède selon la revendication 11, caractérise en ce qu'il comprend en outre une amplification liée a un contrôle automatique de gain afin de compenser l'affaiblissement du signal HF dans la paire torsadée. 12. The method of claim 11, characterized in that it further comprises an amplification linked to an automatic gain control in order to compensate for the weakening of the HF signal in the twisted pair.
PCT/FR2001/000804 2000-03-16 2001-03-16 Multimedia system and method for distributing radio wave and cable channels in a cable network in twisted pairs WO2001069925A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU44265/01A AU4426501A (en) 2000-03-16 2001-03-16 Multimedia system and method for distributing radio wave and cable channels in acable network in twisted pairs
EP01917171A EP1183866A1 (en) 2000-03-16 2001-03-16 Multimedia system and method for distributing radio wave and cable channels in a cable network in twisted pairs

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR0003387A FR2806571A1 (en) 2000-03-16 2000-03-16 Multimedia distribution system has baluns can use Ethernet twisted pair allows simpler cheaper cabling
FR00/03387 2000-03-16
FR0014562A FR2806572B1 (en) 2000-03-16 2000-11-13 MULTIMEDIA SYSTEM AND METHOD FOR DISTRIBUTING WIRELESS AND CABLE CHAINS IN A CABLE NETWORK IN TORSADE PAIRS
FR00/14562 2000-11-13

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WO2003028369A1 (en) * 2001-09-25 2003-04-03 Henri Lee Television distribution system and processing unit used in said distribution system
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CN102457417A (en) * 2010-10-27 2012-05-16 上海澳润通信技术有限公司 Coaxial network transforming device for 100M Ethernet
US11201442B2 (en) 2016-08-26 2021-12-14 Zhejiang Dahua Technology Co., Ltd. Power over ethernet system, device, and method

Also Published As

Publication number Publication date
AU4426501A (en) 2001-09-24
EP1183866A1 (en) 2002-03-06
FR2806572B1 (en) 2005-02-04
FR2806572A1 (en) 2001-09-21

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