WO2005071891A1 - Reseau local avec transmission de signaux sans translateur - Google Patents

Reseau local avec transmission de signaux sans translateur Download PDF

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Publication number
WO2005071891A1
WO2005071891A1 PCT/DE2005/000116 DE2005000116W WO2005071891A1 WO 2005071891 A1 WO2005071891 A1 WO 2005071891A1 DE 2005000116 W DE2005000116 W DE 2005000116W WO 2005071891 A1 WO2005071891 A1 WO 2005071891A1
Authority
WO
WIPO (PCT)
Prior art keywords
transmission
amplifier
wire
transmitter
lines
Prior art date
Application number
PCT/DE2005/000116
Other languages
German (de)
English (en)
Inventor
Hans-Jürgen Neuhaus
Original Assignee
Siemens Aktiengesellschaft
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
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2005071891A1 publication Critical patent/WO2005071891A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0264—Arrangements for coupling to transmission lines
    • H04L25/0272—Arrangements for coupling to multiple lines, e.g. for differential transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/50—Systems for transmission between fixed stations via two-conductor transmission lines

Definitions

  • the invention relates to a local area network according to the preamble of claim 1.
  • LAN local area networks
  • the physical data transmission takes place for example, over 2 line pairs (twisted pairs) or 4 data lines
  • the physical data transmission takes place for example, over 2 line pairs (twisted pairs) or 4 data lines
  • FIGS. 1A and IB A local area network of this type has the typical configuration shown in FIGS. 1A and IB.
  • FIG. 1A shows the signal flow from the terminal to the switch
  • FIG. IB shows the signal flow in the opposite direction
  • D PD ⁇ and D PD2 transmission drivers on the terminal
  • D S ⁇ and D s2 transmission drivers on the switch
  • a PD denotes a receiving amplifier on the terminal
  • a s denotes a receiving amplifier on the switch.
  • the transmitters are uniformly designated with Ü here, and Rx stands for the reception side and Tx for the transmission side.
  • 1A and IB are self-explanatory with these reference numerals, so that no detailed description is required here.
  • the usual cable impedance of 100 ⁇ is assumed to simplify the illustration. If the cable impedances differ, the terminating resistors must be adjusted accordingly.
  • the receiving direction (Rx) are usually Transformer with a transmission ratio Ü of 1: 1 used.
  • the transmission direction (Tx) depending on the signal output voltage of the transmission driver circuit, not only transmitters with a Ü of 1: 1 but also transmitters with a Ü ⁇ 1 (mostly> 1) are used.
  • Transformers require a relatively large amount of space - in particular a large overall height - and generate relatively high costs compared to other standard electronic components.
  • the invention is therefore based on the object of providing an improved local network, which is particularly compact in the area of the transmitters and is also inexpensive.
  • An essential idea of the invention is to replace the transformers with electronic components in order to save space and / or costs.
  • the solution can be used in particular in end devices (DTE) connected to local networks, e.g. VoIP phones, WLAN access points, Bluetooth access points, etc.
  • an additional amplifier or attenuator is provided to implement a transmission ratio different from 1: 1 in the transmission direction.
  • the additional transmitter-side amplifier or attenuator is designed as a single-ended A amplifier, the load resistance of which in particular also realizes the corresponding line termination.
  • Further expedient developments of the concept of the invention provide, on the one hand, that coupling capacitors are inserted into the 2-wire reception lines to increase the common mode suppression and / or to implement a supply voltage supply for the devices via the signal lines.
  • coupling capacitors are inserted into the 2-wire transmission lines to reduce the receiver sensitivity to component tolerances of the transmission amplifiers and / or to implement a supply voltage supply for the devices via the signal lines.
  • 3A and 3B show a LAN configuration for a transmission ratio Ü> 1 in the transmission direction
  • FIG. 4 shows an illustration of an embodiment of the invention based on FIG. 2B to illustrate additional measures on the switch transmission side
  • 5A and 5B are illustrations of a LAN configuration based on FIGS. 3A and 3B in a preferred embodiment of the invention.
  • Reception direction In principle, the transmitter is replaced in the reception direction (Rx) by simply connecting the (LAN) line to the inputs of the reception amplifier. This is possible because, on the one hand, the transmission ratio of the transmitter in the receiving direction is 1: 1 and, on the other hand, the line is usually potential-free, so that there is no influence on the operating point setting of the receiving amplifier.
  • CMR chokes current-compensated chokes
  • Transmission direction In the transmission direction (Tx), the transmitter is also replaced by simply connecting the (LAN) line to the (series) matching resistors of the transmission driver.
  • FIGS. 2A and 2B the basic illustration in FIGS. 2A and 2B is used, and the same reference numerals are used first as there. In this respect, no further explanation is necessary here.
  • two transistors T1 and T2 each with an assigned voltage divider network R1 / R2 / R3 and a coupling capacitor C1 connected upstream from the respective transmission driver D PD ⁇ , D PD2, are provided on the transmission side on the terminal (FIG. 3A).
  • the switch is also designed on the transmission side. receive direction
  • the transmitter is replaced in the receiving direction by simply connecting the (LAN) lines to the inputs of the receiving amplifier.
  • Transmitters with a transmission ratio Ü> 1 are generally used in the transmission direction.
  • the signal must be preamplified when the signal is coupled without a transmitter. This preamplification can in principle be carried out with commercially available integrated amplifiers.
  • video operational amplifiers with the required high bandwidth and slew rate are recommended here.
  • suitable video operational amplifiers - in large quantities - are available at relatively low prices, however, using the transmission transformer when using video operational amplifiers for the signal amplification then required does not (yet) appear to be economical.
  • the implementation of the required signal amplifier with discrete components currently appears to be more economical than the use of integrated circuits.
  • Push-pull output stages are usually used as line drivers - in the switch or terminal.
  • the implementation of a discrete amplifier with push-pull stage encounters technical hurdles.
  • single-ended A output stages are used as line drivers.
  • the transmission impedances (especially 2x 50 ⁇ ) required for matching to the line, which are in series with the output stages in push-pull output stages, are used directly as the working resistance (collector resistance) of the single-ended A output stage and thus form the parallel to the line required line termination.
  • the transistors T1 and T2 form the core of the single-ended A output stages.
  • the DC operating point of T1 and T2 is set by the resistors R1 and R2.
  • the signal amplification is also set with the resistors R1, R2, R3.
  • the coupling is carried out via the coupling capacitors C1. These capacitors can be omitted if the resistors R1, R2, R3 are dimensioned while taking into account the offset DC voltage.
  • a signal weakening (at Ü ⁇ 1) can also be realized with resistors R1, R2, R3.
  • To adapt to the (LAN) line should be the parallel connection of the resistors Ra and Rb 50 ⁇ .
  • FIGS. 5A and 5B show the LAN configuration with additional measures for improving the common-mode rejection on the receiving side or for avoiding offset DC voltages in the transmission direction.
  • coupling capacitors C2 and. are respectively on the transmission side on the terminal (FIG. 5A) and on the switch (FIG. 5B)
  • Coupling capacitors C3 are provided in the signal lines on the receiving side on the switch (FIG. 5A) or on the terminal (FIG. 5B).
  • the coupling capacitors C3 can be used to improve the common-mode rejection (CMR) of the receiving amplifier - especially at low (mains) frequencies. These form a high pass with the two 50 ⁇ resistors and capacitor C. Furthermore, the direction of reception by the coupling capacitors C3 can also be used for local networks fed via the signal lines. In addition, coupling capacitors may simplify measures against overvoltages.
  • CMR common-mode rejection
  • an offset DC voltage (a DC voltage difference) between the collectors of T1 and T2.
  • An offset voltage can lead to saturation of the transformer core in transformers and thus distort or even completely prevent signal transmission.
  • a simple solution for preventing an offset DC voltage from being fed into the line is to insert the (at least one) coupling capacitor C2. For reasons of symmetry, a capacitor C2 should be inserted in each of the two transmission lines.
  • the transmission direction can also be used by the coupling capacitors C2 for local networks fed via the signal lines.
  • coupling capacitors may simplify measures against overvoltages.
  • a PD A s receiving amplifier

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Amplifiers (AREA)

Abstract

Réseau local à 4 fils pourvu d'appareils connectés du côté réception à des lignes de réception à 2 fils et du côté émission à des lignes d'émission à 2 fils, lesdits appareils étant des terminaux et des commutateurs. Au moins une partie des appareils est connectée sans translateur par connexion directe de la ligne de réception à 2 fils à un amplificateur de réception ou par connexion directe de la ligne d'émission à 2 fils à un dispositif amplificateur d'émission.
PCT/DE2005/000116 2004-01-26 2005-01-25 Reseau local avec transmission de signaux sans translateur WO2005071891A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004004488.0 2004-01-26
DE200410004488 DE102004004488A1 (de) 2004-01-26 2004-01-26 Lokales Netz mit übertragerloser Signalübertragung

Publications (1)

Publication Number Publication Date
WO2005071891A1 true WO2005071891A1 (fr) 2005-08-04

Family

ID=34801200

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2005/000116 WO2005071891A1 (fr) 2004-01-26 2005-01-25 Reseau local avec transmission de signaux sans translateur

Country Status (2)

Country Link
DE (1) DE102004004488A1 (fr)
WO (1) WO2005071891A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006061494B4 (de) * 2006-12-23 2008-09-04 Semikron Elektronik Gmbh & Co. Kg Einrichtung zur Übertragung von Daten innerhalb eines leistungselektronischen Systems und Verfahren zu deren Betrieb

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4993063A (en) * 1987-03-03 1991-02-12 Kiko Frederick J Channel unit interface circuit
US5510751A (en) * 1993-07-14 1996-04-23 U.S. Philips Corporation Line driver with adaptive output impedance
EP0969633A2 (fr) * 1998-06-30 2000-01-05 Nec Corporation Circuit d'attaque de ligne différentiel
US6154066A (en) * 1998-12-15 2000-11-28 Oak Technology, Inc. Apparatus and method for interfacing integrated circuits having incompatible I/O signal levels
WO2003026320A1 (fr) * 2001-08-31 2003-03-27 Siemens Aktiengesellschaft Procede et dispositif de transmission locale en monoconducteur de signaux pcm sans translateur
US20030201802A1 (en) * 2002-04-26 2003-10-30 Young Brian D. Driver and amplifier circuitry

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5285477A (en) * 1991-12-18 1994-02-08 At&T Bell Laboratories Balanced line driver for local area networks or the like
US5818874A (en) * 1997-01-31 1998-10-06 Northern Telecom Limited Transformerless data transmission line driver
US7072478B2 (en) * 2001-09-24 2006-07-04 Taylor Hohendahl Engineering Llp Microphone preamplifier

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4993063A (en) * 1987-03-03 1991-02-12 Kiko Frederick J Channel unit interface circuit
US5510751A (en) * 1993-07-14 1996-04-23 U.S. Philips Corporation Line driver with adaptive output impedance
EP0969633A2 (fr) * 1998-06-30 2000-01-05 Nec Corporation Circuit d'attaque de ligne différentiel
US6154066A (en) * 1998-12-15 2000-11-28 Oak Technology, Inc. Apparatus and method for interfacing integrated circuits having incompatible I/O signal levels
WO2003026320A1 (fr) * 2001-08-31 2003-03-27 Siemens Aktiengesellschaft Procede et dispositif de transmission locale en monoconducteur de signaux pcm sans translateur
US20030201802A1 (en) * 2002-04-26 2003-10-30 Young Brian D. Driver and amplifier circuitry

Also Published As

Publication number Publication date
DE102004004488A1 (de) 2005-08-18

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