WO2001050626A2 - Procede et dispositif pour convertir un flux de donnees s0 bidirectionnel en vue d'une transmission par l'intermediaire d'un reseau basse pression - Google Patents

Procede et dispositif pour convertir un flux de donnees s0 bidirectionnel en vue d'une transmission par l'intermediaire d'un reseau basse pression Download PDF

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Publication number
WO2001050626A2
WO2001050626A2 PCT/DE2000/004542 DE0004542W WO0150626A2 WO 2001050626 A2 WO2001050626 A2 WO 2001050626A2 DE 0004542 W DE0004542 W DE 0004542W WO 0150626 A2 WO0150626 A2 WO 0150626A2
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WO
WIPO (PCT)
Prior art keywords
transmission
area
low
nsn
binary
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PCT/DE2000/004542
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German (de)
English (en)
Other versions
WO2001050626A3 (fr
Inventor
Jörg STOLLE
Ralf Neuhaus
Hans-Dieter Ide
Original Assignee
Siemens Aktiengesellschaft
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Publication of WO2001050626A2 publication Critical patent/WO2001050626A2/fr
Publication of WO2001050626A3 publication Critical patent/WO2001050626A3/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H04B3/548—Systems for transmission via power distribution lines the power on the line being DC
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
    • H04Q11/0435—Details
    • H04Q11/0471—Terminal access circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5404—Methods of transmitting or receiving signals via power distribution lines
    • H04B2203/5408—Methods of transmitting or receiving signals via power distribution lines using protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5429—Applications for powerline communications
    • H04B2203/5445—Local network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5429—Applications for powerline communications
    • H04B2203/545—Audio/video application, e.g. interphone
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13034—A/D conversion, code compression/expansion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/1308—Power supply
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13202—Network termination [NT]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13209—ISDN
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13292—Time division multiplexing, TDM

Definitions

  • a known data transmission method is the transmission of data via the power supply network, frequently referred to in the literature as 'powerline communication', abbreviated to 'PLC *'.
  • 'PLC *' One advantage of using the power supply network as a medium for data transmission is the existing network infrastructure. Almost every household has access to the electricity supply network as well as an existing, widely ramified domestic electricity network.
  • the electricity supply network in Europe is divided into different network structures or transmission levels depending on the type of energy transmission.
  • the high voltage level with a voltage range from 110 kV to 380 KVB is used for energy transmission over long distances.
  • the medium-voltage level with a voltage range of 10 kV to 38 kV serves to carry the electrical energy from the high-voltage network close to the consumer and is lowered for the consumer by means of suitable network transformers to a low-voltage level with a voltage range of up to 0.4 kV.
  • the low voltage level is subdivided into a so-called out-of-home area - also known as a 'last mile' or 'access area' - and a so-called in-house area - also known as a 'last meter'.
  • the out-of-home area of the low-voltage level defines the area of the power supply network between the power transformer and a meter unit assigned to each consumer.
  • the domestic area of the low-voltage voltage level defines the range from the
  • the EN 50065 standard defines four different frequency ranges - often referred to in the literature as CENELEC bands A to D - with an approved frequency range from 9 kHz to 148.5 kHz and a maximum permissible transmission power that are reserved solely for data transmission based on 'Powerlme Communication'.
  • a transmission of digital voice data requires a collision-free point-to-multipoint data transmission in full duplex operation, ie an error-free, simultaneous data transmission in both transmission directions between several participants.
  • a known data transmission method for the transmission of digital voice data is the ISDN transmission method (Integrated Services Digital Network).
  • a data transfer measure the ISDN transmission method which meets the above conditions, for example, based on the most ⁇ th So interface - often m the literature as Basi ⁇ sanschluß called - take place.
  • the present invention is based on the object, measure ⁇ took provide, through which c is an implementation of a S - Schn ttstelle for data transmission based on a 'Po wasline Communication' can take place.
  • a major advantage of the method and device according to the invention is that by implementing the known S 0 interface for data transmission based on 'Powerlme Communication', conventional ISDN communication terminals are simple and inexpensive for data transmission via a derstromstromnetz can be used.
  • a further advantage of the method according to the invention or the device according to the invention is that by using known compression methods or compression devices based, for example, on the ITU-T standardized speech coding algorithm G.729, the compression method or compression devices can be used in a simple manner to transmit an S 0 data stream via the low-voltage power network can be reduced.
  • An advantage of the embodiments of the invention defined in the subclaims is, inter alia, that the existing tree structure of the low-voltage electricity network in the domestic area can be easily connected to a master-slave communication system. cation-configured relationship between a master device confi ⁇ , a respective consumer associated payer ⁇ unit and connected to the low voltage power grid, can be direction as slave I obligations configured Kirunikationsemrich- displayed.
  • Em further advantage of m the dependent claims defined embodiments of the invention is that by use of the implemented for the S 0 -Schn ⁇ ttstelle Ubertra- supply mechanisms bi-directional and collision-free, since ⁇ tenübjust via the low-voltage power network at up to a maximum of 8 connected slave Einrlchtitch without additional Implementation effort can be realized.
  • 1 a structural diagram for the schematic representation of a power supply network
  • 2 shows a structure diagram for the schematic representation of a conversion of an S 0 data stream encoded in an inverted AMI channel code, and a binary encoded S 0 data stream
  • 3 a structural diagram for the schematic representation of a compression of the binary-coded S 0 data stream carried out by a compression unit; 4: a structural diagram for the schematic representation of a linearization of the binary-coded S c data stream; 5: e structural diagram for the schematic representation of an implementation of the S 0 data stream for transmission via a low-voltage network in accordance with a first implementation mode;
  • Fig. 1 shows a structural diagram with a schematic representation of a power supply network.
  • the power supply network is subdivided ⁇ m dependence of Energyubertragungart different network structures or Ubertragungsebenen.
  • the high-voltage level or the high-voltage network HSN with a voltage range of 110 kV to 380 kV is used for energy transmission over long distances.
  • the medium-voltage level or the medium-voltage network MSN with a voltage range from 10 kV to 38 kV serves to conduct the electrical energy from the high-voltage network close to the consumer.
  • the medium-voltage network MSN is connected to the high-voltage network HSN via a transformer station HSN-MSN TS that converts the respective voltages.
  • the medium-voltage network MSN is additionally connected to the low-voltage network NSN via a further transformer station MSN-NSN TS.
  • the low voltage level or the low voltage network with a voltage range up to 0.4 kV is divided into a so-called AHB out-of-home area and m a IHB so-called in-house area.
  • the out-of-home area AHB defines the area of the low-voltage network NSN between the further transformer station MSN-NSN TS and a number unit ZE assigned to a respective consumer.
  • the in-house area IHB defines the area from the payment unit ZE to the connection units AE arranged in the in-house area IHB.
  • a connection unit AE is, for example, a socket connected to the low-voltage network NSN.
  • the low-voltage network NSN in the IHB in-house area is usually designed as a tree network structure, the payment unit ZE forming the root of the tree network structure.
  • the payment unit ZE forming the root of the tree network structure.
  • For transmission of digital voice data - insbesonde ⁇ re based on the S 0 -Schn ⁇ ttstelle - about Stromversor ⁇ supply network is a transmission bandwidth of several megabits / sec necessary with a suitable transmission response which option is currently available only in the low-voltage network NSN.
  • the S o interface uses a so-called 'inverted AMI channel code' (alernate mark inversion) as the line code, which must be converted into a binary code in order to implement the S 0 interface for data transmission via the low-voltage network NSN m.
  • Em S 0 data stream consists of a sequence of so-called S 0 frames SR to be transmitted.
  • the AMI channel code is a pseudoternary line code in which the two binary states "0" and "1" are represented by the three signal potentials '0', '1' and '-1'.
  • the binary state "1" is represented by the signal potential '0'.
  • Either positive or negative signal potential '1' or '-1' is assigned to the binary state "0", the polarity changing between two successive "0" states.
  • An Sr interface essentially comprises 2 user data anal, which are each designed as ISDN-oriented B channels with a transmission bit rate of 64 kbit / s each and a signaling channel, which is an ISDN-oriented D channel with a transmission bit rate of 16 kbit / s is configured.
  • a 4-drant transmission is generally provided for bidirectional data transmission via the So interface, the two transmission directions - hereinafter referred to as downstream direction DS and upstream direction US - being carried over separate lines.
  • the downstream direction DS defines the data transmission over a transmission link from a central, which ⁇ transmission controlling means - hereinafter referred to as 'master' M - to the other on the transmission link is closed ⁇ devices - hereinafter referred to as 'slaves' S, respectively.
  • the Üpstream direction US defines the data about ⁇ transmission from the respective slave S to the master M.
  • the figure shows an S 0 frame SR downstream direction DS and m upstream direction US for a pseudo-ternary S 0 data stream coded in the inverted AMI channel code.
  • Em So frame SR has a frame length of 250 ⁇ s and comprises a total of 48 bits.
  • 16 bits of useful information are transmitted via a first useful data channel B1 and 16 bits of useful information are transmitted via a second useful data channel B2 as well as 4 bits of signaling information via the signaling channel.
  • additional control bits are used in an S 0 frame SR, for example for access control, for a synchronization of the downstream data stream DS and the upstream data stream US and for the realization of higher system services in accordance with the OSI layer model transmitted.
  • Frame SR m is an 48-bit comprehensive, binar coded informa tion ⁇ converted and long by a 2-B ⁇ t long header H to ei ⁇ nem 50 bits Binarrahmen BR summarized.
  • the header H comprises a synchronization bit SYN and an initial state bit ANF.
  • the initial status bit ANF contains information about the signal potential associated with the first “0” status in the AMI channel code. Since the signal potential for the "0" was to ⁇ may have the potential 1 or -1, this Infor ⁇ mation for Wiederher tokelt the original AMI channel code at the receiver side is necessary.
  • the synchronization bit SYN is used to synchronize the mutually assigned S 0 frames SR for the downstream data stream DS and the upstream data stream US that have been restored on the receiver side from the bar frames BR, since the associated So frames SR for the downstream - and the upstream data stream DS, US - as can be seen from the figure - are mutually offset by two bits.
  • FIG. 3 shows a schematic representation of a method for compressing the binary-coded S 0 data stream consisting of a sequence of BM frames BR.
  • forty storage frames BR-Rl, ..., BR-R40 m assigned to a transmission direction DS, US are temporarily stored in a storage device ZSP.
  • the logical frames BR-Rl, ..., BR-R40 m stored in a separation unit ASE are each subdivided into m logical units and separated from one another.
  • Logical units form, for example, the header H, the first user data channel B1 and the second user data channel B2.
  • the logical units of the market frames BR-Rl, ..., BR-R40 are then - as illustrated in the figure - combined to form a processing frame and forwarded to an ear and compression unit LKE.
  • the processing frames formed from the header H, the signaling channel D and the additional control bits are carried out transparently, ie without compression by the linearization and compression unit LKE.
  • the processing frames formed by the first and the second user data channel B1, B2, on the other hand, are each fed to a channel-specific learning unit LE of the learning and compression unit LKE.
  • the processing frame assigned to a user data channel B1, B2 comprises a total of eighty user bytes assigned to a respective user data channel B1, B2, with each binary frame BR-R1, ..., BR-R40 being assigned two user data bytes in the processing frame.
  • the user information transmitted in the context of the first and second user data channels B1, B2 is coded as standard with an 8 bit resolution according to a non-linear, so-called A characteristic. In order to achieve known compression To use driving, is one of the compression pre ⁇ switched linearization of the payload necessary.
  • the 8-bit resolution is converted to a 16-bit resolution.
  • the processing frames with the linearly coded useful data information are then each fed to a channel-specific compression unit KE-B1, KE-B2.
  • the channel-specific compression units KE-B1, KE-B2 compress the user data information transmitted to the processing frame in accordance with the compression standard G.729.
  • This speech coding algorithm converts the linearly coded 16 bit samples with a sampling frequency of 8 kHz m into an 8 kbit / s data stream.
  • a voice segment with a duration of 10 ms - this corresponds to a length of 1280 bit useful data information in the present exemplary embodiment - is necessary for a parameter calculation to be carried out according to the algorithm.
  • the compressed processing frames KR-Bl, KR-B2 are subsequently fed to a frame forming unit RBE, which contains the compressed useful data information contained in the compressed processing frames KR-Bl, KR-B2 in accordance with the originally uncompressed bar frames BR-Rl, ..., BR-R40 sepa ⁇ ert and with the further information transparently led by the linearization and compression unit LKE - as shown in the figure - to a compressed binary frame KBR puts together.
  • E compressed binary frame KBR thus has 22 bits of information - 4 bits of user data information and 18 bits of additional information - with a duration of 250 ⁇ s.
  • the transmission bandwidth required for the transmission of a compressed binary frame KBR is thus reduced ⁇ in contrast to an uncompressed bear frame BR from 200 kbit / s to 88 kbit / s.
  • the compressed market frames KBR are then transmitted to a transmission unit UEE for feeding in the low-voltage network NSN.
  • FIG. 4 shows a schematic illustration of a method for linearizing the useful data information summarized in the processing frame.
  • the useful data information transmitted to the useful data channels B1, B2 is briefly coded in accordance with the pulse code modulation PCM.
  • the pulse code modulation uses a non-linear, so-called "A characteristic" for the coding.
  • the A-Kennlmie consists of a total of 13 sections - also referred to as segments.
  • each amplitude value of a signal to be sampled is represented by 8 bits.
  • the first bit indicates the sign of the sampled signal.
  • the next 3 bits define the relevant segment of the A characteristic and the last 4 bits define a quantization level within a segment. This results in a total of 256 possible quantization levels.
  • the linearization unit LE converts the useful data information m em encoded according to the non-linear A characteristic, and encoded signal according to a linear characteristic.
  • the 8-bit resolution used by the A-Kennlmie is converted to a 16-bit resolution.
  • the use of a linear coding with a 16 bit resolution creates the conditions for a subsequent use of the compression method according to the ITU-T standard G.729.
  • Fig. 5 shows em structure diagram for schematically illustrating an implementation of the pseudoternaren S-founded in the inverted AMI channel ko ⁇ , 0 data stream for transmission via the low-voltage network NSN according to a first implementation mode.
  • the pseudo-ternary S data stream coded according to the inverted AMI channel code is converted by the conversion unit UE - as described with reference to FIG. 2 - into a binary coded S data stream.
  • the binary-coded S 0 data stream consisting of a sequence of bar frames BR is forwarded to a compression unit KE, through which the binary-coded Sr data stream - as described with reference to FIGS. 3 and 4 - is imaged and is compressed.
  • the compressed S data stream m em is then converted for the data format provided for data transmission via the low-voltage network NSN.
  • a master-slave communication relationship is set up for data transmission between the facilities connected to the NSN low-voltage network in the IHB area and the payment unit ZE assigned to the IHB area.
  • the number unit ZE arranged in the IHB in-house area, which forms the root of the tree structure, is defined as master M and the further devices connected to the low-voltage network NSN via the connection units AE are defined as slaves S.
  • So-called PLC data packets with a length of 250 ⁇ s each are provided for data transmission via the low-voltage network NSN, which are subdivided into a PLC header PLC-H and a user data area.
  • the PLC header PLC-H essentially comprises an address information for addressing the slaves S connected to the low-voltage network NSN.
  • the address information can be assigned by a MAC address (medium access Control).
  • the MAC address is a Unambiguous ⁇ ge, is moved on the layer 2 of the OSI reference model 6-byte hardware address.
  • a Adressie ⁇ be realized tion of devices connected to the low voltage network NSN SLA ves S by a rating based on the ATM protocol (Asynchronous Transfer Mode) VPI / VCI addressing (Virtual Path Identifier / Virtual Channel Identifier).
  • ATM protocol Asynchronous Transfer Mode
  • VPI / VCI addressing Virtual Path Identifier / Virtual Channel Identifier
  • the useful data area of the PLC data packet is designated in accordance with the time duplex method - in the literature also referred to as 'Time Division Duplex' in short 'TDD' - in two frames - in the literature also referred to as duplex areas - subdivided.
  • the user data area is divided into a downstream area DS-B and m an upstream area US-B.
  • both the downstream and the upstream areas DS-B, US-B of the user data area of the PLC data packet are used in accordance with the time-division-based multiple access control method - in the literature also as' time division multiple Access' abbreviated 'TDMA' - divided into several channels - often referred to as time slots.
  • the number of channels and duplex area corresponds to the maximum number of slaves S that can be connected to the low-voltage network NSN.
  • a maximum of eight different slaves SI - S8 can be addressed by the master M via the S 0 interface, see above that the duplex areas in the present approximately for each eight m are each 22 bits long channels tergliedert un ⁇ .
  • the respective subdivision of the laplex areas in an equal number of channels is referred to in literature as symmetrical frame formation.
  • Each slave SI-S8 is assigned a fixed channel per duplex area by being allowed to send or receive, i.e. the compressed bar frames KBR assigned to the slaves SI-S8 are inserted or removed from the respective duplex area by the protocol unit PE and assigned to the respective ⁇ em slave ⁇ l-S8.
  • the compressed bar frames KBR assigned to the slaves SI-S8 are inserted or removed from the respective duplex area by the protocol unit PE and assigned to the respective ⁇ em slave ⁇ l-S8.
  • a cyclically fixed, hierarchical transmission sequence is implemented for each duplex area.
  • this transmission process is usually referred to as 'polling' and can be easily implemented using the TDMA method.
  • the PLC data packets are then transmitted from the protocol unit PE to a transmission unit UEE for transmission via the low-voltage network NSN.
  • the transmission unit UEE implements the data transmission, for example in accordance with the OFDM transmission method (Orthogonal Frequency Division Muliplex) with an upstream FEC error correction (Forward Error Correction) and an upstream DQPSK modulation (difference quadrature phase shift key). mg). Further information on these transmission and mula- lation processes can be found in Jörg Stolle's previously unpublished thesis: "Powerline Communication PLC", 5/99, Siemens AG.
  • the useful data area of the PLC data packet m is divided into a total of 16 channels, each with a 22-bit length. Without taking the PLC header into account, this results in a required transmission bit rate of:
  • the binary-coded S 0 data stream consisting of a sequence of bar frames BR is forwarded in a next step to a compression unit KE, through which the binary-coded S data stream - as described with reference to FIGS. 3 and 4 - is imaged and is compressed.
  • the compressed S 0 data stream m em is then converted for the data format provided for data transmission via the low-voltage network NSN.
  • the second implementation mode creates an asymmetrical frame.
  • the user data area of the PLC data packet is subdivided into a downstream area and m an upstream area DS-B, US-B according to the time-division duplex method.
  • the upstream area US-B of the useful data area of the PLC data packet is subdivided into eight channels, each 22 bits long, according to the time-division-based multiple access control method.
  • Each slave SI - S8 is permanently assigned to the US-B em channel in the upstream area by being allowed to transmit, ie the compressed binary frames KBR assigned to the slaves SI - S8 become the respective channel of the upstream assigned to the slave SI - S8 by the protocol unit PE m - area US-B added.
  • the transmission process is implemented in the so-called 'pollmg', analogous to the first implementation mode.
  • the downstream area DS-B comprises only a single 22-bit channel, via which data is transmitted from the master M to the slaves SI-S8.
  • the downstream direction DS m of the master M as the only means sends to the can in the first order to dispense ver ⁇ ⁇ reduction mode realized to multi-point structure point.
  • the useful information to be transmitted is sent in parallel to all slaves SI - S8.
  • This transmission method is generally referred to as "broadcast mg" operation. In this way, the transmission bit rate required for data transmission via the low-voltage network NSN in the downstream direction DS can be reduced.
  • the PLC data packets are finally transmitted from the protocol unit PE to a transmission unit UEE for transmission via the low-voltage network NSN.
  • the transmission unit UEE realizes the data transmission analogous to the first conversion mode according to the OFDM transmission method with an upstream FEC error correction and an upstream DQPSK modulation.
  • the PLC data packets are read out from the low-voltage network NSN and converted into a pseudo-ternary S 0 data stream coded in accordance with the inverted AMI channel code, analogously to the described mode of operation, only in the opposite direction.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Signal Processing (AREA)
  • Telephonic Communication Services (AREA)
  • Time-Division Multiplex Systems (AREA)

Abstract

Selon l'invention, un flux de données S0 pseudoternaire, consistant en une suite de cadres S0 (SR), est converti en un flux de données binaire, consistant en une suite de cadres binaires (BR). L'information utile contenue dans un cadre binaire (BR) est ensuite séparée du cadre binaire (BR) par une unité de compression (KE) et est ensuite comprimée. L'information utile comprimée est ensuite regroupée avec les informations non comprimées du cadre binaire (BR) pour former un cadre binaire comprimé (KBR). Les cadres binaires comprimés (KBR) sont ensuite introduits dans un paquet de transmission prévu pour assurer une transmission par l'intermédiaire du réseau basse tension (NSN) et conçu selon le procédé du duplex temporel et le procédé d'accès multiple fondé sur le multiplexage temporel, avant d'être acheminé jusqu'à une unité de transmission (UEE) pour être transmis par l'intermédiaire du réseau basse tension (NSN).
PCT/DE2000/004542 1999-12-30 2000-12-19 Procede et dispositif pour convertir un flux de donnees s0 bidirectionnel en vue d'une transmission par l'intermediaire d'un reseau basse pression WO2001050626A2 (fr)

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DE19963814.4 1999-12-30
DE19963814 1999-12-30

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WO2001050626A2 true WO2001050626A2 (fr) 2001-07-12
WO2001050626A3 WO2001050626A3 (fr) 2001-11-29

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1372270A1 (fr) * 2001-02-27 2003-12-17 Sekisuijushi Co., Ltd Emetteur-recepteur electrique comportant deux conducteurs et procede correspondant

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
F\HST C ET AL: "Unter Strom -Die Power-Line-Technologie vor dem kommerziellen Einsatz" NET - ZEITSCHRIFT F]R KOMMUNIKATIONSMANAGEMENT, Bd. 52, Nr. 7, 1998, Seiten 48-49, XP000777785 ISSN: 0947-4765 *
HENSEN C ET AL: "ISDN-So-Bus Extension by Power-Line Using CDMA Technique" PROCEEDINGS OF THE 3RD INTERNATIONAL SYMPOSIUM ON POWER-LINE COMMUNICATIONS AND ITS APPLICATIONS (ISPLC'99), LANCASTER, UK, 30. M{rz 1999 (1999-03-30) - 1. April 1999 (1999-04-01), XP001009460 *
ITU-T G.729 - CODING OF SPEECH AT 8 KBIT/S USING CONJUGATE-STRUCTURE ALGEBRAIC-CODE-EXCITED LINEAR-PREDICTION (CS-ACELP), M{rz 1996 (1996-03), XP002170340 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1372270A1 (fr) * 2001-02-27 2003-12-17 Sekisuijushi Co., Ltd Emetteur-recepteur electrique comportant deux conducteurs et procede correspondant
EP1372270A4 (fr) * 2001-02-27 2006-01-11 Sekisuijushi Co Ltd Emetteur-recepteur electrique comportant deux conducteurs et procede correspondant
US7116962B2 (en) 2001-02-27 2006-10-03 Sekisuijushi Co., Ltd. Two-wire power transmitting/receiving device and its method

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