AU2006291635A1 - Method for transferring signals - Google Patents
Method for transferring signals Download PDFInfo
- Publication number
- AU2006291635A1 AU2006291635A1 AU2006291635A AU2006291635A AU2006291635A1 AU 2006291635 A1 AU2006291635 A1 AU 2006291635A1 AU 2006291635 A AU2006291635 A AU 2006291635A AU 2006291635 A AU2006291635 A AU 2006291635A AU 2006291635 A1 AU2006291635 A1 AU 2006291635A1
- Authority
- AU
- Australia
- Prior art keywords
- signal
- baseband ethernet
- ethernet signal
- catv
- gate
- Prior art date
- Legal status (The legal status 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 status listed.)
- Abandoned
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/24—Systems for the transmission of television signals using pulse code modulation
- H04N7/52—Systems for transmission of a pulse code modulated video signal with one or more other pulse code modulated signals, e.g. an audio signal or a synchronizing signal
-
- 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]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/21—Server components or server architectures
- H04N21/214—Specialised server platform, e.g. server located in an airplane, hotel, hospital
- H04N21/2143—Specialised server platform, e.g. server located in an airplane, hotel, hospital located in a single building, e.g. hotel, hospital or museum
-
- 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]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
- H04N21/2365—Multiplexing of several video streams
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/10—Adaptations for transmission by electrical cable
- H04N7/102—Circuits therefor, e.g. noise reducers, equalisers, amplifiers
- H04N7/104—Switchers or splitters
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Description
WO 2007/032680 PCT/NL2006/050226 METHOD FOR TRANSFERRING SIGNALS 5 The invention relates to a method for transmitting signals to and from at least one signal processing unit, comprising in a direction towards the signal processing unit: 10 - a first step, in which an incoming baseband Ethernet signal is combined with an incoming CATV signal into a combined signal, using a filter, wherein the combined signal comprises the baseband Ethernet signal and the CATV signal; 15 - a second step, in which the combined signal is transmitted to at least one building in which a CATV cable is installed; 20 - a third step, in which the transmitted, combined signal is split into a baseband Ethernet signal and a CATV signal, using a filter similar to that used for combining the signals; 25 - a fourth step, in which the baseband Ethernet signal is transmitted to the signal processing unit and the CATV signal is transmitted to a CATV installation in the building; and 30 in a direction away from the signal processing unit: - transmitting an outgoing baseband Ethernet signal from the signal processing unit along the same paths as the combined signal, albeit in opposite direction.
WO2007/032680 PCT/NL2006/050226 2 The invention also relates to a device for carrying out this method, comprising: 5 - means for receiving an incoming baseband Ethernet signal; - means for receiving an incoming CATV signal; 10 - means for combining the baseband Ethernet signal with the CATV signal into a combined signal, using a filter, wherein the combined signal comprises the baseband Ethernet signal and the CATV signal; 15 - means for transmitting the combined signal to at least one subscriber in a building in which a CATV cable is installed; 20 - means for splitting the transmitted combined signal into a baseband Ethernet signal and a CATV signal at the subscriber's end, using a filter similar to that used for combining the signals, and also for transmitting the baseband Ethernet signal to the 25 signal processing unit and the CATV signal to a CATV installation in the building; - means for receiving an outgoing baseband Ethernet signal from the signal processing unit and for 30 transmitting the outgoing baseband Ethernet signal along the same paths as the combined signal, albeit in opposite direction.
WO 2007/032680 PCT/NL2006/050226 3 Such a method and such a device are known from European patent No. 1 099 349 (Macab AB). It is known to transmit signals, for example analog or digital signals such as a radio and/or television signals or other so-called utility 5 signals, from a distribution unit to subscriber units over a traditional cable transmission network comprising coaxial cables. The cable bandwidth that is available for the signals is optimally utilised in this manner, and the available channels are heavily occupied with utility signals so as to 10 make exploitation of the cable network commercially feasible. At present it is also known to use such a cable transmission network for bidirectional transmission of data (i.e. signals) so as to enable activities and/or services, for example, which may or may not be interactive activities and/or 15 services, wherein subscribers transmit data to each other and/or to a distribution unit via the network. The distribution unit will also be provided with receiving means in that case, and the transmitting subscriber unit will be provided with transmission means. An example of such a 20 subscriber unit suitable for bidirectional data flow is a cable modem. The object of the invention is to improve the method and the device described in the aforesaid European patent, and in 25 order to accomplish that object a method of the kind referred to in the introduction is characterised in that the incoming baseband Ethernet signal and the outgoing baseband Ethernet signal are transmitted simultaneously. This enables a quick and efficient bidirectional data flow between signal 30 processing units (i.e. computers) of subscribers of the cable network.
WO2007/032680 PCT/NL2006/050226 4 In a further preferred embodiment of a method according to the invention, use is made of a fork circuit comprising a transmission gate, a receiving gate and a bidirectional gate, which is arranged downstream of the filter of the first step, 5 seen along the path that starts from the signal processing unit, wherein the incoming baseband Ethernet signal and the outgoing baseband Ethernet signal are combined at the bidirectional gate and split at the transmission gate and the receiving gate. Such a fork circuit is also called a 10 "splitter". In such circuits, additional filters are in particular used in a path of the incoming baseband Ethernet signal at the transmission gate of the fork circuit and in a path of the outgoing baseband Ethernet signal at the receiving gate of the fork circuit. In other words, by 15 connecting these additional filters, also called "simple low pass filters", in series with the filter of the first step, an adequate isolation is realised between the paths of the incoming and the outgoing baseband Ethernet signals. After all, both additional so-called "simple low-pass filters" will 20 reject signals with a frequency F 1 (wherein F, is about 65 MHz, being the upper limit of the frequency range of the bidirectional data flow), and since these two filters are each connected in cascade with the filter of the first step, this effect will be doubled. The filter of the first step 25 will moreover reject signals with a frequency > F 2 , wherein F 2 FI, (wherein F 2 is about 70 MHz, being the lower limit of the frequency range of the utility signals), so that signals with a frequency 5 F 2 will not be reflected by said filter. The isolation between the aforesaid paths enables 30 simultaneous bidirectional data flows between signal processing units (computers) over the cable transmission network.
WO2007/032680 PCT/NL2006/050226 5 In another preferred embodiment of a method according to the invention, use is made of BALUNs in the path of the incoming baseband Ethernet at the transmission gate of the fork circuit and in the path of the outgoing baseband Ethernet 5 signal at the receiving gate of the fork circuit. Preferably, the incoming baseband Ethernet signal and the outgoing baseband Ethernet signal are 100-base-T signals, i.e. so called "fast Ethernet signals". 10 In another preferred embodiment of a method according to the invention, the filter of the first step is a diplex filter. According to the invention, a device of the kind referred to in the introduction is characterised in that means are 15 provided for transmitting the incoming baseband Ethernet signal and the outgoing baseband Ethernet signal simultaneously. In a preferred embodiment of a device according to the 20 invention, the means for transmitting the incoming baseband Ethernet signal and the outgoing baseband Ethernet signal simultaneously comprise: - a fork circuit comprising a transmission gate, a 25 receiving gate and a bidirectional gate, wherein the incoming baseband Ethernet signal and the outgoing baseband Ethernet signal are combined at the bidirectional gate and split at the transmission gate and the receiving gate; and 30 - additional filters in a path of the incoming baseband Ethernet signal at the transmission gate of the fork circuit and in a path of the outgoing baseband WO2007/032680 PCT/NL2006/050226 6 Ethernet signal at the receiving gate of the fork circuit. Thus, an optimum isolation of the fork circuit is created for signals with a frequency - F 1 , since the filter of the first step will not reject or 5 reflect such signals. For signals with a frequency a FI, an adequate isolation between the incoming and the outgoing baseband Ethernet signals is realised by the aforesaid cascade-connected filters. 10 The invention will now be explained in more detail with reference to a figure illustrated in a drawing, which shows (in block diagram) a preferred variant of an electronic circuit for use in the method according to the invention. 15 The block diagram that is shown in the figure relates to an Ethernet 100-base-T signal system, wherein a four-wire symmetrical 100 Ohm 4B/5B "multilevel coded" 125 M baud system is used. To enable simultaneous bidirectional data flows between computers A and B over the traditional cable 20 transmission network comprising coaxial cables, incoming and outgoing baseband Ethernet signals need to be adequately isolated from each other. To that end a fork circuit or "splitter" (1) comprising a transmission gate (2), a receiving gate (3) and a bidirectional gate (4) is used, and 25 an incoming baseband Ethernet signal (Tx) and an outgoing baseband Ethernet signal (Rx) are combined at the bidirectional gate (4) and split at the transmission gate (2) and the receiving gate (3). Furthermore, a "simple low-pass filter" (7,7') and a BALUN (8,8') are arranged in a path (5) 30 of the incoming baseband Ethernet signal (Tx) at the transmission gate (2) of the fork circuit (1) and also in a path (6) of the outgoing baseband Ethernet signal (Rx) at the receiving gate (3) of the fork circuit (1). These "simple WO2007/032680 PCT/NL2006/050226 7 low-pass filters" (7,7') are connected in series with a diplex filter (9). The diplex filter (9) functions to combine the incoming baseband Ethernet signal (Tx) with an incoming CATV signal (2) into a combined signal (11), so that the 5 combined signal (11) can subsequently be transmitted to a subscriber (not shown). The baseband Ethernet signals usually have a frequency in the frequency band from 5 MHz to 65 MHz ("low-pass" in the diplex filter (9)), whilst the CATV signals usually have a frequency in the frequency band from 10 70 MHz to 862 MHz ("high-pass" in the diplex filter (9)). It is noted that also other bandwidths are used. The two "simple low-pass filters" (7,7') are arranged to reject signals with a frequency > F, (wherein F, is about 65 15 MHz, being the upper limit of the frequency range of the bidirectional data flow). The diplex filter (9) rejects signals with a frequency a F 2 , wherein F 2 > F, (wherein F, is about 70 MHz, being the lower limit of the frequency range of the utility signals), so that signals with a frequency F 2 20 will not be reflected by said diplex filter (9). In other words, since the two filters (7,7') are each connected in cascade with the diplex filter (9), the rejection effect of signals with a frequency Fl is doubled. In this way an adequate isolation between the aforesaid paths 25 (5,6) is realised. As already noted before, a circuit similar to the electronic circuit that is shown in the figure is used at the subscriber's end. Said similar circuit is the mirror image of 30 the electronic circuit that is shown in the figure.
WO2007/032680 PCT/NL2006/050226 8 The invention is not restricted to the illustrated embodiment, but it also extends to other preferred variants that fall within the scope of the appended claims.
Claims (8)
1. A method for transmitting signals to and from at least one signal processing unit, comprising 5 in a direction towards the signal processing unit: - a first step, in which an incoming baseband Ethernet signal is combined with an incoming CATV signal into 10 a combined signal, using a filter, wherein the combined signal comprises the baseband Ethernet signal and the CATV signal; - a second step, in which the combined signal is 15 transmitted to at least one building in which a CATV cable is installed; - a third step, in which the transmitted, combined signal is split into a baseband Ethernet signal and a 20 CATV signal, using a filter similar to that used for combining the signals; - a fourth step, in which the baseband Ethernet signal is transmitted to the signal processing unit and the 25 CATV signal is transmitted to a CATV installation in the building; and in a direction away from the signal processing unit: 30 - transmitting an outgoing baseband Ethernet signal from the signal processing unit along the same paths as the combined signal, albeit in opposite direction; WO2007/032680 PCT/NL2006/050226 10 characterised in that the incoming baseband Ethernet signal and the outgoing baseband Ethernet signal are transmitted simultaneously.
2. A method according to claim 1, wherein use is made of a 5 fork circuit comprising a transmission gate, a receiving gate and a bidirectional gate, which is arranged downstream of the filter of the first step, seen along the path that starts from the signal processing unit, wherein the incoming baseband Ethernet signal and the 10 outgoing baseband Ethernet signal are combined at the bidirectional gate and split at the transmission gate and the receiving gate.
3. A method according to claim 2, wherein use is made of 15 additional filters in a path of the incoming baseband Ethernet signal at the transmission gate of the fork circuit and in a path of the outgoing baseband Ethernet signal at the receiving gate of the fork circuit. 20
4. A method according to claim 2 or 3, wherein use is made of BALUNs in the path of the incoming baseband Ethernet at the transmission gate of the fork circuit and in the path of the outgoing baseband Ethernet signal at the receiving gate of the fork circuit. 25
5. A method according to any one of the preceding claims 1 4, wherein the incoming baseband Ethernet signal and the outgoing baseband Ethernet signal are 100-base-T signals. 30
6. A method according to any one of the preceding claims 1 5, wherein the filter of the first step is a diplex filter. WO 2007/032680 PCT/NL2006/050226 11
7. A device for carrying out a method according to any one of the preceding claims 1-6, comprising: - means for receiving an incoming baseband Ethernet 5 signal; - means for receiving an incoming CATV signal; - means for combining the baseband Ethernet signal with 10 the CATV signal into a combined signal, using a filter, wherein the combined signal comprises the baseband Ethernet signal and the CATV signal; - means for transmitting the combined signal to at 15 least one subscriber in a building in which a CATV cable is installed; - means for splitting the transmitted combined signal into a baseband Ethernet signal and a CATV signal at 20 the subscriber's end, using a filter similar to that used for combining the signals, and also for transmitting the baseband Ethernet signal to the signal processing unit and the CATV signal to a CATV installation in the building; 25 - means for receiving an outgoing baseband Ethernet signal from the signal processing unit and for transmitting the outgoing baseband Ethernet signal along the same paths as the combined signal, albeit 30 in opposite direction; WO2007/032680 PCT/NL2006/050226 12 characterised by means for transmitting the incoming baseband Ethernet signal and the outgoing baseband Ethernet signal simultaneously. 5
8. A device according to claim 7, wherein the means for transmitting the incoming baseband Ethernet signal and the outgoing baseband Ethernet signal simultaneously comprise: 10 - a fork circuit comprising a transmission gate, a receiving gate and a bidirectional gate, wherein the incoming baseband Ethernet signal and the outgoing baseband Ethernet signal are combined at the bidirectional gate and split at the transmission gate 15 and the receiving gate; and - additional filters in a path of the incoming baseband Ethernet signal at the transmission gate of the fork circuit and in a path of the outgoing baseband 20 Ethernet signal at the receiving gate of the fork circuit.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL1029952 | 2005-09-14 | ||
| NL1029952A NL1029952C2 (en) | 2005-09-14 | 2005-09-14 | Method for transmitting signals. |
| PCT/NL2006/050226 WO2007032680A2 (en) | 2005-09-14 | 2006-09-11 | Method for transferring signals |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2006291635A1 true AU2006291635A1 (en) | 2007-03-22 |
Family
ID=35709152
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2006291635A Abandoned AU2006291635A1 (en) | 2005-09-14 | 2006-09-11 | Method for transferring signals |
Country Status (5)
| Country | Link |
|---|---|
| CN (1) | CN101292529A (en) |
| AU (1) | AU2006291635A1 (en) |
| DE (1) | DE112006002439T5 (en) |
| NL (1) | NL1029952C2 (en) |
| WO (1) | WO2007032680A2 (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1252169A (en) * | 1983-07-25 | 1989-04-04 | Friedrich Vesterling | Method and apparatus for transmitting base-band data in a conductor carrying an rf signal |
| AU7833598A (en) * | 1997-06-12 | 1998-12-30 | Int Labs, Inc. | Multiple computer data channels, video, audio, and/or telephone signals in a single transmission medium |
| SE521942C2 (en) | 1998-07-20 | 2003-12-23 | Macab Ab | Data communication method and apparatus |
| EP1119968A1 (en) * | 1998-10-14 | 2001-08-01 | Scientific-Atlanta, Inc. | Cable television system for transmitting unmodulated data |
| US6481013B1 (en) * | 1998-11-09 | 2002-11-12 | Peracom Networks, Inc. | Entertainment and computer coaxial network and method of distributing signals therethrough |
| JP3468712B2 (en) * | 1999-02-23 | 2003-11-17 | シンクレイヤ株式会社 | Multiplex transmission system for data signal and television signal and high-frequency transmission device thereof |
-
2005
- 2005-09-14 NL NL1029952A patent/NL1029952C2/en not_active IP Right Cessation
-
2006
- 2006-09-11 DE DE112006002439T patent/DE112006002439T5/en not_active Withdrawn
- 2006-09-11 AU AU2006291635A patent/AU2006291635A1/en not_active Abandoned
- 2006-09-11 WO PCT/NL2006/050226 patent/WO2007032680A2/en active Application Filing
- 2006-09-11 CN CNA2006800384414A patent/CN101292529A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| CN101292529A (en) | 2008-10-22 |
| NL1029952C2 (en) | 2007-03-15 |
| WO2007032680A2 (en) | 2007-03-22 |
| WO2007032680A3 (en) | 2007-12-06 |
| DE112006002439T5 (en) | 2008-07-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MK4 | Application lapsed section 142(2)(d) - no continuation fee paid for the application |