초록 ▼

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 ca

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. 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.

대표청구항 ▼

[ I claim:] [1.] Communications apparatus for use with an electricity distribution and/or power transmission network 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 input and/or removal of a telecommunicati

[ I claim:] [1.] Communications apparatus for use with an electricity distribution and/or power transmission network 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 input and/or removal of a telecommunication signal from the network, said communications apparatus comprising:a main inductor arranged between a mains electricity input from said network and a mains electricity output to said consumer's premises to allow the low frequency high amplitude mains electricity power signal to pass through the main inductor in a low impedance path from the mains electricity input from said network to said mains electricity output to said consumer's premises for frequencies from zero frequency to a low frequency of said low frequency high amplitude mains electricity power signal; anda coupling capacitor connected between said mains electricity input and a signal input/output line to allow the telecommunication signal to pass through the coupling capacitor in a path between said mains electricity input and the signal input/output line and to attenuate low frequency components of said low frequency high amplitude mains electricity power signal.