ABSTRACT
To meet current needs for fast data transmission such as internet access into homes and businesses, new technologies are being developed that use the radio frequencies to achieve high speeds. One of the important commercial considerations in providing such services is what infrastructure to use and if such infrastructure is not available how best to provide it. Naturally, fiber-optic networks can be used with excellent results but they must be built afresh where they do not already exist, with consequent substantial costs. However, in the developed world virtually all domestic and commercial premises have telephone networks installed and in the less developed world substantial infrastructure exists in telephone networks and virtually all homes have a connection to the power network. The question therefore arises whether telephone and/or power networks could be used to transmit high-speed data. The commercial advantages are substantial since an existing widely available infrastructure can be used. In the case of the power network, not only is there a connection into every home but also into every room! Hence, high-speed data would be accessible from everywhere. The question relevant to EMC is what impact such services may have on the radio spectrum.
