Abstract: Power line communication method and apparatus in which data modulated radio frequency carriers from two different sources are transmitted by the power line, the range of frequencies of the carriers from one source partially overlapping the range of frequencies of the carriers from the other source, and in which carriers of the one source are shifted to frequencies other than the overlapping frequencies when carriers at the overlapping frequencies and from the other source are present on the line. Optionally, the data signal sampling rate can be changed to simplify signal filtering requirements.

Abstract: An adaptive radiated emission control includes measurement of the transmit power spectrum and feedback to a variable power modulator. The variable power modulator creates an adjusted output spectrum that limits radiated emissions. Alternatively, the variable power modulator may also be an equalizer to adjust the output spectrum.

Abstract: Apparatus for coupling communication signal modulated radio frequency signals between an electrical power distribution line and the electrical power wiring at a customer's premises which includes a first transceiver for transmitting and receiving electromagnetic energy is inductively coupled to the distribution line and a second transceiver for receiving electromagnetic energy from, and transmitting electromagnetic energy to, the first transceiver. The second transceiver is coupled to the customer's power wiring to receive communication signals from, and to supply communication signals to, the customer's power wiring. The electrical power for the first transceiver can be supplied by inductive coupling to the power line and/or a battery, the battery being a back-up source when both inductive coupling and a battery are present.

Abstract: A method and system for providing coexistence of power line communication technologies on a common powerline and to communicate with each other. A plurality of devices is provided, each of a different and non-compatible powerline communication technologies. A set of predefined beacon signals for each device is also provides, each signal having a frequency bands. The bands are continuously monitoring for activity. From the activity, necessary changes are derived to accommodation modes to identify devices which may operate outside a norm causing the network of devices to operate incorrectly.

Abstract: A portable, pluggable power line communications device provides convenient interfacing and connectivity between separate data networks interconnected over the same conventional electric power conveying media. The power line communications device plugs into a single electrical outlet, and includes a controller that is programmable at the device or remotely. Remote programming is achieved over the same power media to which the communications device is coupled, or by wireless link. The power line communications device controls data communications signal transfer over the common electric wiring of a local network, and conducts high-speed communications and download of multimedia signals from an upstream network controllers using the common electric power media. The data communications signals of the co-existing, different networks are encoded to permit differentiation at the power line communications device.