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US 5,684,450 AGranted
Electricity distribution and/or power transmission network and filter for telecommunication over power lines
AssigneeNorweb PLC
InventorPaul Anthony Brown
Life of this patent
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AssigneeNorweb PLC
InventorPaul Anthony Brown
Estimating the term…
A power transmission network which includes an input for the input of telecommunication signals having carrier frequencies greater than 1 MHz onto the network, and removing similar speech and/or data signals from the network. Preferably a network conditioning element is used which includes a low pass filter portion for filtering out a low frequency high amplitude mains power signal, and a coupling element for input and/or removal of telecommunication signals from the network. In this way both speech and data signals can be transmitted at carrier frequencies of greater than 1 MHz along a standard electricity distribution and/or transmission network which when conditioned provides a larger available spectrum per unit length of network and greater transmission capacity than previously known. The quiescent noise level of the conditioned network is also much reduced thus permitting lower signal injection levels for a given signal-to-noise ratio and a consequential reduction in spurious radiation from the network.
A polyphase electricity distribution and/or power transmission network comprising:
A trunk and branch multipoint electricity distribution and/or power transmission network including input means for input onto the network of a telecommunication signal having a carrier frequency greater than approximately 1 MHz and output means for removing the telecommunication signal from the network;
An electricity distribution and/or power transmission network at least part of which is external to a building, the network including input means for input onto the network of a telecommunication signal having a carrier frequency greater than approximately 1 MHz and output means for removing the telecommunication signal from the network, the telecommunication signal being transmissible along the external part of the network;
Communications apparatus for use with an electricity distribution and/or power transmission network, including a low pass filter portion for allowing, in use, a low frequency high amplitude mains electricity power signal to pass from the network to a consumer's premises and for preventing electrical noise from the premises entering the network, and a coupling element for input and/or removal of a telecommunication signal from the network,
A method of signal transmission including:
A method of signal transmission including input of a telecommunication signal having a carrier frequency of greater than approximately 1 MHz onto an electricity distribution and/or power transmission network at least part of which is external to a building and subsequent reception of the telecommunication signal, the telecommunication signal being transmitted along the external part of the network;
A trunk and branch multipoint electricity distribution and/or power transmission network at least part of which is external to a building, the network including:
A trunk and branch multipoint electricity distribution and/or power transmission network at least part of which is external to a building, the network including:
A method of signal transmission including input of a telecommunications signal having a carrier frequency of greater than approximately 1 MHz onto a phase conductor of a trunk and branch multipoint electricity power distribution and/or transmission network at least part of which is external to a building and subsequent reception of the telecommunications signal, said telecommunications signal being transmitted along said external part of the network, wherein the network includes a plurality of separate buildings and said telecommunications signal is transmitted between said buildings, and wherein the network includes three phase conductors and the telecommunications signal is input onto only one phase conductor and is subsequently received from at least one other phase conductor, and wherein said telecommunications signal is input onto and received from the network using communications apparatus, the apparatus including a low pass filter portion for allowing a low frequency high amplitude mains electricity power signal to pass from the network to a consumer's premises and for preventing electrical noise from the premises entering the network, and a coupling element for input and/or removal of the telecommunications signal from the network.
A method of signal transmission including input of a telecommunications signal having a carrier frequency of greater than approximately 1 MHz onto a phase conductor of a trunk and branch multipoint electricity power distribution and/or transmission network at least part of which is external to a building and subsequent reception of the telecommunications signal, said telecommunications signal being transmitted along said external part of the network, wherein said telecommunications signal is input onto and received from the network using communications apparatus, the apparatus including a low pass filter portion for allowing a low frequency high amplitude mains electricity power signal to pass from the network to a consumer's premises and for preventing electrical noise from the premises entering the network, and a coupling element for input and/or removal of the telecommunications signal from the network, wherein said low pass filter comprises a main inductor arranged between a mains electricity input and a mains electricity output and connected at the mains electricity input end to a first capacitor and at the mains electricity output end to a second capacitor, said first capacitor connecting the mains electricity input to a signal input/output line, and said second capacitor connecting the mains electricity output to ground.
Dependencies are inferred from the claim text.