Transmission network and filter therefor
DC CAFCFirst Claim
1. A method of signal transmission including input of a telecommunication signal having a carrier frequency of greater than approximately 1 MHz onto a trunk and branch multipoint electricity distribution and/or power transmission network, and subsequent reception of the telecommunication signal, wherein the telecommunication signal is input onto and received from the network using communications apparatus, the communications apparatus including a low pass filter portion allowing a low frequency high amplitude mains electricity power signal to pass from the network to a consumer'"'"'s premises and preventing electrical noise from the premises entering the network, and a coupling element providing input and/or removal of the telecommunication signal from the network.
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Reexamination
Accused Products
Abstract
A power transmission network which includes an 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.
218 Citations
10 Claims
- 1. A method of signal transmission including input of a telecommunication signal having a carrier frequency of greater than approximately 1 MHz onto a trunk and branch multipoint electricity distribution and/or power transmission network, and subsequent reception of the telecommunication signal, wherein the telecommunication signal is input onto and received from the network using communications apparatus, the communications apparatus including a low pass filter portion allowing a low frequency high amplitude mains electricity power signal to pass from the network to a consumer'"'"'s premises and preventing electrical noise from the premises entering the network, and a coupling element providing input and/or removal of the telecommunication signal from the network.
- 7. 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.
Specification