WO2004030255A2 - Verfahren und vorrichtung zum bidirektionalen übertragen von elektronischen daten in einem fernsehdaten-kabelnetzwerk - Google Patents
Verfahren und vorrichtung zum bidirektionalen übertragen von elektronischen daten in einem fernsehdaten-kabelnetzwerk Download PDFInfo
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- WO2004030255A2 WO2004030255A2 PCT/DE2003/003201 DE0303201W WO2004030255A2 WO 2004030255 A2 WO2004030255 A2 WO 2004030255A2 DE 0303201 W DE0303201 W DE 0303201W WO 2004030255 A2 WO2004030255 A2 WO 2004030255A2
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/65—Arrangements characterised by transmission systems for broadcast
- H04H20/76—Wired systems
- H04H20/77—Wired systems using carrier waves
- H04H20/78—CATV [Community Antenna Television] systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/2801—Broadband local area networks
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/426—Internal components of the client ; Characteristics thereof
- H04N21/42676—Internal components of the client ; Characteristics thereof for modulating an analogue carrier signal to encode digital information or demodulating it to decode digital information, e.g. ADSL or cable modem
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
- H04N21/4363—Adapting the video stream to a specific local network, e.g. a Bluetooth® network
- H04N21/43637—Adapting the video stream to a specific local network, e.g. a Bluetooth® network involving a wireless protocol, e.g. Bluetooth, RF or wireless LAN [IEEE 802.11]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/61—Network physical structure; Signal processing
- H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
- H04N21/6118—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving cable transmission, e.g. using a cable modem
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/61—Network physical structure; Signal processing
- H04N21/6156—Network physical structure; Signal processing specially adapted to the upstream path of the transmission network
- H04N21/6168—Network physical structure; Signal processing specially adapted to the upstream path of the transmission network involving cable transmission, e.g. using a cable modem
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/10—Adaptations for transmission by electrical cable
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/16—Analogue secrecy systems; Analogue subscription systems
- H04N7/173—Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal
- H04N7/17309—Transmission or handling of upstream communications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/22—Adaptations for optical transmission
Definitions
- the invention is in the field of bidirectional transmission of electronic data in a television data network based on cables.
- FIG. 1 shows a schematic representation of the network levels in a conventional cable network.
- the cable network has a largely homogeneous structure.
- a broadband cable amplifier point 1 (BKNrSt) is followed by a higher-level broadband cable amplifier point 2 (ÜBKVrSt).
- the broadband cable repeater 1 and the higher-level broadband cable repeater 2 belong to a regional pre-accession network for the television program feed.
- the local production network is followed by a connection network in which a broadband cable amplifier point 3 (BBKVrSt) on the user side is arranged.
- the television data are then distributed in a local distribution network via A, B and C distributors (A, B and C-Vr).
- A-lines are main lines of the cable network that originate from a central network node.
- B lines are lines branching off A lines, which assume a first sub-distribution.
- C lines are in turn a representation of the B lines, via which the network is finely branched.
- the television data is fed into a further network level via a transfer point (ÜP), in which the distribution to the users then takes place.
- ÜP transfer point
- glass fiber connections for the distribution of television signals are often present even in the older networks.
- Behind the broadband cable amplifier point 3 are the amplifier points with a maximum distance of 300m.
- Cable network operators are increasingly trying to expand their range of services. This involves services such as pay TV, video on demand, "fast" Internet via the cable network and telephony.
- the cable network In order to be able to offer Internet data via the cable networks, the cable network must be able to return channels, which means that data can also be transferred to the the technical direction of the cable network incurs about 70% of the total investment costs in the area of the local distribution network and the subsequent further network level. The amount of the investment costs depends on how the network upgrade is planned.
- HFC Hybrid Fiber Coax
- fiber optic cables replace the coaxial cables in the area of the local distribution network.
- the fiber optic cables must first be laid for this purpose.
- Figure 2 shows the principle of a cable network upgraded to HFC technology.
- the coaxial cables (coax) commonly used in the cable network are combined with fiber optic cables (fiber optic cables).
- the use of glass Fiber cables in cable networks differ from the use of fiber optic cables in telecommunications networks. Telecommunication networks carry information regardless of the content of this data. Whether Internet data or MPEG image data - the transport in the fiber optic network is the same.
- TV signals are transparently forwarded via the glass fiber cable in the HFC network. These signals are transported in glass fibers to a fiber node. If Internet services are also to be offered, each node needs two fiber optic connections; one for the down stream and one for the back channel. Since specific information, such as the channel division in the cable network, is already contained in the signal, these are not the usual data standards as are the case on the Internet or in WAN networks.
- the signal from the fiber optic network is converted to the coaxial cable network in the fiber node. Here, the signal is no longer processed, since it is already present in the fiber optic modulated. At this point there is often talk of a hub that has a different function in a purely digital network.
- CMTS Common Modem Termination System
- the CMTS provides the connection to the wide area network or the Internet service provider.
- the signals are converted to a telecommunications standard for transfer to the wide area network.
- the connection of the CMTS to a data network is realized with a common standard (STM, ATM, lOOBaseT, etc.).
- STM Session Initiation Protocol
- ATM ATM
- lOOBaseT lOOBaseT
- FIG. 3 schematically shows the assignment of the frequency band of a television data cable network in the originally used manner (upper representation in FIG. 3) and with HFC technology (lower representation in FIG. 3) in comparison.
- the return channel 30 is operated in the frequency range from 5 to 65 MHz or 5 to 45 MHz.
- the modulation method used is QPSK (QPSK - "Quadrature Phase Shift Keying") up to a maximum of QAM 16 (QAM - "Quadrature Amplitude Modulation”) that a capacity of 3 to 10 Mbit / s is available in the return channel.
- the CMTS can serve several return channels at the same time. This results in a concentration of return channel data at the CMTS level.
- the standard cable networks have a channel division with a bandwidth of 8 MHz per channel. 1 analogue transmitter or 5 - 6 digital transmitters can be accommodated in an 8 MHz channel. If a channel is left free, i.e. not occupied by a television transmitter, up to 52 Mbit / s modulated data can be transported downwards. This property is used to deliver the Internet data to the customer in a downward direction (“downstre- am”) via the glass fiber and later via the coaxial cable.
- the assignment of the downlink data stream channel to a cable modem via which the customer is connected to the cable network and the instruction to the cable modem on which frequencies the uplink data can be sent from is a function of the CMTS.
- the object of the invention is to provide an improved method and an improved device for the bidirectional transmission of electronic data in a television data cable network, which implement the bidirectional transmission of electronic data for expanded media services with increased bandwidth in a less expensive and therefore more cost-effective manner enable the television data cable network.
- the object is achieved according to the invention by a method according to independent claim 1 and a device according to independent claim 8.
- the invention encompasses the idea of forming a return channel capability in a television data cable network by forming a main transmission line (“backbone”) in an upper limit range of a transmission bandwidth of the cable connections of the television data cable network. Upstream ") are implemented via the main transmission line.
- the data fed into the television data cable network via an entry point are converted for transmission in the main transmission line.
- the data transfer between the user interface and the entry point also takes place in the opposite direction with the aid of at least two data conversions. In this way, it is possible that the user continues to use his usual cable modem, via which the device he is using is connected to the television data cable network, even though the data are transmitted in a frequency range that deviates from the usual data transfer.
- FIG. 1 shows a schematic representation of a structure of a cable network according to the prior art
- Figure 2 is a schematic representation of a cable network with known
- FIG. 3 schematically shows the assignment of the frequency band of a television data
- FIG. 4 shows a schematic illustration of a subdivision of a television data
- FIGS. 5A and 5B schematically the assignment of the frequency band of a television data cable network for different embodiments, each an area for the downward data stream and the upward data stream is formed in the upper limit range of the transmission bandwidth;
- Figure 6 is a schematic block diagram of an apparatus for processing electronic data in the bidirectional transmission of electronic data in a television data cable network with an occupancy of the
- Figure 7 is a schematic block diagram of another device for
- Figure 8 shows a frequency assignment
- Figure 9 is a schematic representation of a section from the segmented
- FIG. 10 shows a schematic illustration of an amplifier point of the section from the segmented television data cable network according to FIG. 9;
- Figure 11 is a schematic representation of another amplifier point of the
- FIG. 12 shows a schematic illustration of another amplifier point of the section from the segmented television data cable network according to FIG. 9.
- FIG. 13 shows a schematic illustration of a modified amplifier point to the further amplifier point in FIG. 11.
- the television data cable network is divided into several segments I, II and III.
- Each segment can comprise, for example, 250 to 500 user interfaces, which are usually assigned to a residential unit which is connected to the television data cable network.
- the segments I-III are called DOCSIS Segments carried out (DOCSIS - "Data Over Cable Service Interface Specification"). This is a common standard for the transmission of digital data in television data cable networks.
- DOCSIS - "Data Over Cable Service Interface Specification" This is a common standard for the transmission of digital data in television data cable networks.
- the standard downstream data stream (“downstre- am”) to the user sites is carried out in one or two 8 MHz wide channels.
- An upstream data stream (“upstream”) of television signals away from the user stations is carried out in a frequency range between 5 and 28.75 MHz.
- a main transmission line (“backbone”) is realized, via which the data of the extended media services are transmitted to the DOCSIS segments I-III.
- the main transmission line is implemented in a frequency range above 470 MHz or 606 MHz (see FIGS. 5A and 5B).
- Frequency bands of the main transmission line are realized adjacent to one another, an adjacent formation also being present if the frequency bands (upward, downward) are spaced apart in order to avoid technical problems, in particular mutual signal interference. For example, transmission rates of up to 1 Gbit / s can be implemented in each direction.
- a processing device 60 serves as an interface for processing electronic data between the DOCSIS standard and the main transmission line in the upper frequency range.
- the processing device 60 is used to process customer-specific data in order to be able to transmit this broadband in the main transmission line from an entry point to the user interfaces or in the opposite direction. This requires data conversions between the DOCSIS standard and the upper limit area in which the main transmission route is formed.
- Table 1 The function of individual elements of the processing device 60 is shown in Table 1.
- the directional coupler 67 and the splitter 66 can thus be combined and can be implemented, for example, as a multi-stage crossover network (FSpW).
- the multi-stage crossover can occur several times on the output side and takes over, among other things, the function of coupling and decoupling a remote supply voltage.
- fges is in the range 0 Hz up to and including 2.4 GHz.
- the function groups tuner 61 and demodulator 62 and / or modulator 64 and transmitter 65 can be implemented as a common block. In any case, it should be pointed out that these function blocks generally appear more than once.
- the central control unit 63 are Functions such as multiplexers, demultiplexers, access control for the media, bandwidth management, billing functions, subscriber management and management assigned.
- functional elements 61 ', 62', 64 ', 65', 66 ', 67' which are comparable in terms of functionality to the functional elements 61, 62, 63, 64, 65 and 67, can be used as an interface 70 for local services a B-line branch 70 'can be defined.
- a possible configuration of the function block 68 is shown in FIG. 7 to illustrate this exemplary embodiment. In another embodiment (not shown), the modulator 64 'and the demodulator 62' can be omitted.
- the scheme shown in FIG. 8 results for the frequency assignment.
- the DOCSIS upstream data stream (return path) is implemented between fl and f2 as standard.
- the downward data stream is transmitted in a free television channel in the ESB (ESB - Extended Special Channel Area), ie between f2 and ß.
- ESB ESD - Extended Special Channel Area
- the downward and upward data streams can be realized (divided into two sub-ranges in the frequency band).
- FIG. 9 shows a schematic representation of a section from the segmented television data cable network in which both television data and further electronic data, for example Internet data, are transmitted between an entry point 80 and user interfaces 81.
- a downward data stream (DD) and an upward data stream (DU) are used in accordance with the DOCSIS standard.
- DD downward data stream
- DU upward data stream
- TVDD DOCSIS standard
- electronic data are transmitted downwards (BD) and upwards (BU) via the main transmission line.
- a processing device 82 is implemented, which corresponds to the processing device 60 in FIG. 6.
- FIG. 10 and 11 A possible detailed implementation of such a processing device as an amplifier point is shown in FIG.
- Further amplifier points 83 and 84 each with a functional description, are explained below in connection with FIGS. 10 and 11.
- the requested electronic data are entered at the entry point 80 digitally fed in a frequency range above 470 or 606 MHz.
- the processing device 82 With the help of the processing device 82, all data sent are demodulated, processed and newly modulated.
- the requested data are transmitted in an extended special channel area (ESB) according to the DOCSIS standard.
- ESD extended special channel area
- the requested data is again modulated into the upper limit of the transmission band with the main transmission route and transmitted to the associated segments.
- Commercially available cable modems can be used on the user interface cells in order to demodulate the data received according to the DOCSIS standard for playback, for example by means of a personal computer, telephone or the like.
- the data fed in by the user via the cable modem are modulated in the frequency range between 5 MHz and 28.75 MHz.
- further processing takes place, which comprises demodulation and modulation in the upper frequency range with the main transmission line.
- These data are then transmitted to the entry point 80 via the main transmission route.
- any modulation method is used that enables data communication at high data rates. For example, 8 MHz wide channels are used in which, depending on the properties of the cable, between 38 Mbit / s and 52 Mbit / s can be transmitted in the television data cable network.
- One or more communication processors are an essential component of the processing device 60. These processors primarily serve a data bus that represents the internal interface standard. In addition to the data, there are also external interfaces served. These external interfaces are pluggable and can therefore be replaced. In the simplified representation according to FIG. 8, three interfaces are shown: (a) High-frequency interface to the decoupling point
- This interface is constructed on the basis of components which are based on the DVB-C standard (DVB - "Digital Video Broadcast"). Due to the possibility of data transport based on the DVB standard, both the downward and upward data become and The downward data stream channels are available to each A amplifier point through the amplifiers in the downward data stream.
- the assignment of downward data stream channels to the DOCSIS modems is also carried out by the processing device 60. This creates Optimal flexibility in terms of capacity allocation, since several DOCSIS segments can either use their own or a downlink data stream channel already used by another segment.
- the modulation can be carried out with QAM 16 to QAM 256, per downstream stream channel and 8 MHz Channel width a capacity of up to up to 52 Mbit / s possible.
- the required reverse amplifier for the upper frequency range is a sub-octave band amplifier which, in contrast to the regulated down-stream amplifiers, which have to amplify the entire band from 5 to 862 MHz, is considerably cheaper.
- the DOCSIS interface allows the use of conventional cable modems.
- the electronic components required for DOCSIS are available on the market, for example from manufacturers such as Broadcom or Texas Instruments.
- the DOCSIS modems are managed by a function in the CMTS.
- the management of the channels in the DOCSIS segments (cf. FIG. 4) and the control over the MAC (MAC - "Medium Access") and PHY ("Physical") layer is taken over by the processing device.
- MAC Medium Access
- PHY Physical
- This procedure allows that each segment can be integrated into the entire network architecture, but is operated as an independent unit and thus problems regarding the timing behavior are minimized. Coupling out to a telecommunications network is therefore also possible at any point at which a processing device device is installed and an appropriate interface is available.
- Components for the DOCSIS interface are also available from companies such as Broadcom or Texas Instruments.
- the decoupling interface to the main transmission line connects the coaxial network with a telecoinmination infrastructure, as can be found at a network operator. There are many standards for this decoupling and can be retrofitted accordingly if necessary.
- the interfaces lOOBaseT and STM are provided, for example. This enables decoupling both on copper and on an optical basis. Installation at the amplifier point
- the implementation of the described method additionally requires a number of crossovers and splitters at the amplifier point.
- the frequency band is divided by the crossovers into the two areas downwards and upwards at the A level (47-700 MHz and 750-862 MHz).
- the upper frequency range (750-862 MHz) is used for upstream communication between the processing devices.
- the lower frequency range (47-700 MHz) includes both the TV channels and the downlink data stream channels for Internet access.
- the crossovers in the amplifier point on the one hand divide the frequency spectrum between upstream data stream, (Euro) DOCSIS and downward data stream and additionally downlink spectrum in up and downlink channels for the return of the signals to the decoupling point.
- the frequencies for the downward data stream and upward data stream are each determined by the processing device 60 and can be identical per segment because there is no forwarding to the next segment.
- the amplifiers required for the uplink are considerably cheaper than the A amplifiers for the entire band, because: (i) it is a sub-octave band and there are no problems with 2nd order distortion are to be taken into account, (ii) no push-pull amplifier is required, (iii) they are easier to balance and (iv) the choice of components is considerably less critical.
- the 45 free channels in the frequency spectrum from 500 to 862 MHz ten channels are still reserved for the transmission of additional digital television programs.
- the remaining 35 channels are allocated to the respective processing device 60 for the transport of the downward data stream and the upward data stream. This provides a total capacity of approx. 1 Gbit / s in the coaxial network without a separate fiber optic connection. Using the existing copper cable instead of replacing it with glass fiber represents a significant saving.
- processing device 60 when upgrading the cable network.
- processing device 60 or versions derived therefrom with a smaller scope of functionalities (cf. description below for FIGS. 10 to 12), a relatively inexpensive method can be offered with which even smaller customer groups can use the digital services of the cable operators.
- the DOCSIS segments are expediently designed so that the maximum capacity that is available is used.
- the DOCSIS channels are combined in the processing device 60, concentrated in a channel in the upper frequency spectrum and forwarded to the decoupling point, namely the entry point or the transfer point to the user interface. Both the control of the DOCSIS downward data stream and of the upstream data stream is taken over by the processing device 60.
- the frequencies used for the C levels can be reused in each segment, since they are not passed on to the next segment.
- the decoupling point the collected signals from all amplifier points are decoupled onto a telecommunications infrastructure.
- the frequencies that are used by the users' modems in the respective segments of the television data cable network are loaded into the processing device 60 by a DOCSIS management server in the BBK or ÜBK.
- the processing device 60 assigns this configuration data to the respective modems in the segment and manages the communication of the modems with the data network.
- the processing device 60 in its various versions is the management unit for the DOCSIS modems and no longer the CMTS as in HFC technology.
- all the processing devices 60 in the cable network are independent nodes which can operate in communication and decoupling independently of the head office or the CMTS. Only the central management of the frequency tables still has to be carried out in the management server.
- the upstream data stream of the respective amplifier points is concentrated in a 38 or 52 Mbit / s channel (approx. 4: 1) and conducted to the decoupling point in the upper frequency band. Due to the additional concentration, there is a delay in communication which the permitted "round-trip time" from the (Euro) DOCSIS standard might not meet.
- the MAC and the PHY layer of the CMTS are integrated in the processing device.
- the advantage here is, in addition to compliance with the (Euro) DOCSIS standard, that the connection of the segments can now also be realized by any purely digital connection Segment, for example via a 1 Gbit / s connection from Arcor, since the BlueGate acts as a bridge between the telecommunications network and the cable network.
- the management server functions can still remain in the CMTS to combine processing device 60 and HFC System to allow.
- the investments required to upgrade existing cable networks are minimal with this procedure.
- one processing device per segment and an additional amplifier for the return path over the upper frequency spectrum are required.
- the required capacity per segment is the determining factor.
- the difference to the 450 MHz network lies in the available downstream data capacity. If the A-amplifiers are upgraded to 862 MHz, the frequency spectrum from approx. 500 MHz to 862 MHz is available for the down / up channels for the communication from the processing device to the decoupling point. As a result, more user interfaces (residential units) can be connected to the cable network before it has to be coupled out to a telecommunications network. Although the total number of possible user interfaces in the segment increases, an upgrade of the B and C amplifiers is not necessary, since the bandwidth per individual segment remains the same. As a rule, this procedure is recommended for larger networks, since up to 20 A amplifiers can be connected in a row.
- the described method can easily be combined with existing HFC technology. For example, the use of HFC technology in urban network planning, where the "rights of way" exist for fiber optic laying. When planning the network for cable operators, additional fiber optics are often laid that are not yet used immediately. These fiber optics can be used as a coupling of Segments are used in which the described method can be carried out with the aid of one or more processing devices 60.
- amplifier points in the segmented cable network are designed according to individual requirements in the respective amplifier point.
- processing devices are shown in detail in FIGS. 10, 11 and 12, which comprise the full functionality of the processing device 60 (cf. FIG. 12) or only a part thereof (cf. FIGS. 10 and 11).
- the following abbreviations are used in Figures 10 to 12: FSpW2 - new remote feed with 3 frequency bands, FSpWR - remote feeder with return path, RüVr - return path amplifier, A / Vr - A-line amplifier, MP - measuring point, HBVr - high-band amplifier, CVt - C-line distributor
- the signals in the high band are amplified in both directions. No further processing of these signals is necessary.
- a new remote feeder with an additional range is required (FSpw2).
- the same repeater (RüVr) can be used to combine the return path signals in the frequency range 5 ... 28.75 MHz as in the embodiment according to FIG. 10.
- a bidirectional high-band amplifier (HBVr) is required, the directions of which are corresponding Crossovers are separated.
- Equalizers and dampers must be provided to match the cable connections of the incoming and outgoing A-lines. 11 correspond in their functionality to the amplifier points 84 in FIG. 9.
- the version of the extended amplifier point according to FIG. 12 represents the central node for a segment to be supplied in the cable network.
- This version in particular also provides the basic functionality of a DOCSIS-CMTS.
- the return path signals are again collected in the RüVr module, but are then not routed to the incoming A line, but are instead fed to a group of DOCSIS upstream data stream receivers (DOCSIS demodulation). Since both the incoming and the outgoing A line as part of the main transmission line (“backbone”) carry high-band signals, the extended remote feed switches (FSpW2) known from the embodiment according to FIG. 11 must be used for the connection.
- the DOCSIS upstream data is multiplexed into the highband upstream data stream by the control processor.
- Upstream data stream channels are decoupled via crossovers and demodulated in a group of DVB demodulators
- the newly multiplexed data streams are fed to a group of DVB modulators, the output signals of which are amplified and fed via crossovers into the incoming A line.
- Demodulators receive the destined for the segment to be supplied in the cable network s
- Data that is implemented with a group of DOCSIS transmitters (DOCSIS modulation) in the frequency range 47 ... 450 MHz intended for distribution. These channels are merged with the pure distribution signals using a special combinatorial assembly (Comb).
- FIGS. 10 to 12 it was assumed that the main transmission line in the upper frequency range only extends over an A-line of the cable network.
- the main transmission route can also be extended to B lines without restrictions, and simple branches are also possible.
- the block diagrams of the extensions of an amplifier point on a B line then differ from those of the types considered so far in FIGS. 11 and 12 in that the A / BVr works on a B line and the BVr with the associated remote feed points (FSpWR ) does not apply (see Figure 13).
- Branches are possible both in the embodiment according to FIG. 11 and in the embodiment according to FIG. 12.
- the previously unused coupler is used in the high-band amplifier.
- FIG. 13 shows this for an embodiment similar to the embodiment according to FIG. 11.
- the high band from the outgoing A line is merged with the high band on one of the two outgoing B lines via the coupler.
- This also requires a new crossover (FSpW2) on the relevant B line.
- Multiple branches of the main transmission line from an amplifier point (Vrp) are not provided because of the high attenuation of the coupler associated with this.
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Computer Networks & Wireless Communication (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Small-Scale Networks (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003277814A AU2003277814A1 (en) | 2002-09-25 | 2003-09-25 | Method and device for the bi-directional transmission of electronic data in a television data cable network |
EP03769210A EP1547386A2 (de) | 2002-09-25 | 2003-09-25 | Verfahren und vorrichtung zum bidirektionalen übertragen von elektronischen daten in einem fernsehdaten-kabelnetzwerk |
US10/529,073 US20060048203A1 (en) | 2002-09-25 | 2003-09-25 | Method and device for the bi-directional transmission of electronic data in a television data cable network |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10244928 | 2002-09-25 | ||
DE10244928.7 | 2002-09-25 |
Publications (2)
Publication Number | Publication Date |
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WO2004030255A2 true WO2004030255A2 (de) | 2004-04-08 |
WO2004030255A3 WO2004030255A3 (de) | 2004-07-29 |
Family
ID=31984109
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/DE2003/003201 WO2004030255A2 (de) | 2002-09-25 | 2003-09-25 | Verfahren und vorrichtung zum bidirektionalen übertragen von elektronischen daten in einem fernsehdaten-kabelnetzwerk |
Country Status (5)
Country | Link |
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US (1) | US20060048203A1 (de) |
EP (1) | EP1547386A2 (de) |
AU (1) | AU2003277814A1 (de) |
DE (1) | DE10344753B4 (de) |
WO (1) | WO2004030255A2 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007046877A2 (en) * | 2005-10-12 | 2007-04-26 | Thomson Licensing | Cable remodulator |
BE1019677A3 (nl) * | 2011-05-02 | 2012-09-04 | Telenet N V | Netwerkinterface-eenheid omvattende een geintegreerde lifeline-schakelaar. |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1949599A1 (de) * | 2005-10-12 | 2008-07-30 | Thomson Licensing | Frequenzselektiver kabelreflektor |
US10491361B2 (en) * | 2017-10-31 | 2019-11-26 | Cable Television Laboratories, Inc | Systems and methods for full duplex amplification |
US10658989B2 (en) * | 2017-10-31 | 2020-05-19 | Cable Television Laboratories, Inc | Systems and methods for full duplex amplification |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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GB2310113A (en) * | 1996-02-12 | 1997-08-13 | Northern Telecom Ltd | A bi-directional communications network |
US20020097674A1 (en) * | 2000-09-22 | 2002-07-25 | Narad Networks, Inc. | System and method for call admission control |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5124980A (en) * | 1989-03-20 | 1992-06-23 | Maki Gerald G | Synchronous multiport digital 2-way communications network using T1 PCM on a CATV cable |
JPH0918855A (ja) * | 1995-06-30 | 1997-01-17 | Fujitsu Ltd | 双方向ケーブルテレビシステム、ケーブルテレビ装置及び処理端末装置 |
US6014545A (en) * | 1997-03-27 | 2000-01-11 | Industrial Technology Research Institute | Growable architecture for high-speed two-way data services over CATV networks |
US6453473B1 (en) * | 1998-09-15 | 2002-09-17 | John C. Watson, Jr. | Access device and system for managing television and data communications through a cable television network |
US7496945B2 (en) * | 2001-06-29 | 2009-02-24 | Cisco Technology, Inc. | Interactive program guide for bidirectional services |
-
2003
- 2003-09-25 DE DE10344753A patent/DE10344753B4/de not_active Expired - Fee Related
- 2003-09-25 EP EP03769210A patent/EP1547386A2/de not_active Withdrawn
- 2003-09-25 WO PCT/DE2003/003201 patent/WO2004030255A2/de not_active Application Discontinuation
- 2003-09-25 AU AU2003277814A patent/AU2003277814A1/en not_active Abandoned
- 2003-09-25 US US10/529,073 patent/US20060048203A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2310113A (en) * | 1996-02-12 | 1997-08-13 | Northern Telecom Ltd | A bi-directional communications network |
US20020097674A1 (en) * | 2000-09-22 | 2002-07-25 | Narad Networks, Inc. | System and method for call admission control |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007046877A2 (en) * | 2005-10-12 | 2007-04-26 | Thomson Licensing | Cable remodulator |
WO2007046877A3 (en) * | 2005-10-12 | 2007-08-23 | Thomson Licensing | Cable remodulator |
BE1019677A3 (nl) * | 2011-05-02 | 2012-09-04 | Telenet N V | Netwerkinterface-eenheid omvattende een geintegreerde lifeline-schakelaar. |
NL2008740A (nl) * | 2011-05-02 | 2012-09-05 | Telenet N V | Netwerkinterface-eenheid omvattende een geã¯ntegreerde lifeline-schakelaar. |
Also Published As
Publication number | Publication date |
---|---|
DE10344753A1 (de) | 2004-04-08 |
EP1547386A2 (de) | 2005-06-29 |
US20060048203A1 (en) | 2006-03-02 |
WO2004030255A3 (de) | 2004-07-29 |
AU2003277814A1 (en) | 2004-04-19 |
AU2003277814A8 (en) | 2004-04-19 |
DE10344753B4 (de) | 2005-11-24 |
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