Abstract: A telecommunications network for linking a plurality of premises, comprising, typically, a fiber optic or coaxial cable, and a plurality of electrical power cables each connected to a respective one of the premises for supplying mains electrical power thereto. Each of the power cables is also connected to the fiber optic or coaxial cable so that telecommunications signals are transmissible between the fiber optic or coaxial cable and each of the power cables. A telecommunications signal is transmissible to the plurality of premises by being transmitted along the fiber optic or coaxial cable and subsequently along the respective power cable of each of the premises.

Abstract: A power transmission network (40) is disclosed which includes an input of telecommunication signals having carrier frequencies greater than 1 MHz onto the network, and a 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.

Abstract: A communications apparatus is adapted for use with a mains electricity transmission and/or distribution network. The communications apparatus includes a signal transmission and/or reception means, and frequency conversion means for converting the frequency of a signal transmitted or received by the signal transmission and/or reception means to a frequency which facilitates improved propagation of the signal on the network. Preferably the signal transmission and/or reception means is adapted to operate according to a telephony standard with uses a relatively high carrier frequency (e.g. CT2), and the frequency conversion means is usable to covert a signal having a relatively high carrier frequency (e.g. CT2) and the frequency conversion means is usable to convert a signal having a relatively high carrier frequency to a signal having a lower carrier frequency.

Abstract: The present invention provides an overhead balanced electricity distribution and/or power transmission network (1201), the network including input means (1301) for the input onto the network of a telecommunications signal having a carrier frequency greater than approximately 1 MHz from an unbalanced source and output means (1301) for removing said telecommunications signal from the network, wherein said input means and said output means provide impedance matching between said network and said source. Thus, propagation of HF communication signals over such networks is optimised, and the input and output means ("conditioning units") provide for interconnection between a source e.g. a relatively low impedance unbalanced HF (possibly coaxial) termination and a high impedance balanced OH EDN, and provide efficient unbalanced to balanced impedance transformation and termination.

Abstract: A power transmission network (40) is disclosed which includes input means (52) for the input of telecommunication signals having carrier frequencies greater than 1 MHz onto the network (40), and a means for removing similar speech and/or data signals from the network.Preferably a network conditioning element (52) is used which includes a low pass filter portion for filtering out a low frequency high amplitude mains power signal, and a coupling lent 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 par unit length of network and greater transmission capacity than previously known.

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.

Abstract: 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.