Coaxial XDSL Signal Transmission via Frequency Segmentation
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Solution Overview
Problem
Existing methods for transmitting digital XDSL signals via coaxial cables, such as CoaxLAN technology, face issues like shared bandwidth, interference with TV and radio signals, and reduced data security due to shared medium topology and continuous power requirements.
Innovation Solution
A method involving the use of balun devices to transform symmetrical VDSL signals into unbalanced signals, coupling them into a coaxial cable in a non-overlapping frequency range, and using RLC filters to attenuate reflections, ensuring each end user receives undivided bit rates without interference and enhanced data security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If CoaxLAN technology is used to transmit XDSL signals via existing coaxial cable, then TV and radio signals can be transmitted simultaneously, but the total bitrate must be shared among multiple end users and data security is reduced
Solution Approach 1:
The patent segments the frequency spectrum into distinct bands: lower frequency range for XDSL signals and upper frequency range for TV/radio signals. This frequency segmentation allows independent transmission channels, so XDSL bandwidth is not shared among users while TV signals remain unaffected, resolving the contradiction between multi-signal transmission and data security
Solution Approach 2:
The patent introduces frequency-selective filters as intermediary components in the signal path. These filters act as mediators that separate XDSL and TV/radio signals in the frequency domain, enabling CoaxLAN to provide both multi-signal transmission capability and exclusive bandwidth allocation for XDSL services
2Adaptability or versatility
If CoaxLAN technology is used to integrate TV and IP signals, then a single interface provides multiple services, but shortwave reception is no longer possible and continuous power supply is required
Solution Approach 1:
The patent transitions from spatial sharing of the coaxial cable to frequency-domain sharing. By allocating different frequency ranges to different services (lower frequencies for XDSL, upper frequencies for TV/radio), the system achieves multi-service integration without physically blocking any signal path, thereby preserving shortwave reception capability while providing integrated services
3Ease of operation
If unbalanced VDSL signals are coupled into coaxial cable, then signal transmission is enabled, but signal reflections occur that impair transmission quality
Solution Approach 1:
The patent introduces impedance matching networks and filtering components as intermediaries between the unbalanced VDSL signals and the coaxial cable. These intermediaries transform the impedance characteristics to match the coaxial cable's 75 ohm impedance, thereby enabling signal transmission while minimizing reflections and maintaining transmission quality
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows each end user to utilize maximum available bandwidth independently, ensuring interference-free operation of TV, radio, and Internet services while increasing data security and compatibility with existing infrastructure.
Implementation Method 1
a first transformation of the first balanced digital VDSL signals into unbalanced VDSL signals by means of a first balun
Implementation Method 2
a damping of a reflection of the unbalanced VDSL signals in the at least one coaxial cable by means of an RLC filter
Data Source
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AI summary
The present invention proposes a method for transmitting digital XDSL signals via a coaxial cable to an end-user interface, wherein the coaxial cable has a total frequency range configured to transmit TV signals and/or radio signals in an upper frequency range of the total frequency range to the end-user interface, the interface comprising an XDSL output, and wherein the method comprises the following steps: - providing first balanced XDSL signals to the coaxial cable at a Digital Subscriber Line Access Multiplexer (DSLAM); - first transforming the first balanced digital DSL signals into unbalanced XDSL signals in the direction of the XDSL output by means of a balun device located between the DSLAM and the interface;- coupling the unbalanced XDSL signals into the at least one coaxial cable in a lower frequency range of the total frequency range, wherein the lower frequency range is subordinated to the upper frequency range without overlap; - attenuation of a reflection of the unbalanced XDSL signals in the at least one coaxial cable by means of a filter; - a second transformation of the unbalanced XDSL signals into second balanced XDSL signals directed towards the XDSL output by means of a balun device associated with the interface; - coupling out the second balanced XDSL signals; - separately providing the second balanced XDSL signals at the XDSL output.