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Abstract

A safety protection system and a related operational method for the electrical protection of users of XDSL communication circuitry. The system is based on continuous monitoring of the current parameters on both the exchange and the remote subscriber ends of the XDSL communication system. The safety protection system samples, digitizes and compares the currents at both XDSL communication system ends. The measured currents are compared to specific limiting current and currents difference levels, based on the relevant safety requirements. Whenever required, based on the measured currents status, the safety system shuts down the XDSL communication system, or limits its maximum current. In another embodiment of the invention the safety system is based on continuous monitoring of the voltages related to ground of the two system communication wires, on one or both of the exchange and the remote subscriber ends of the XDSL communication system. The safety system compares the measured voltages and limits the XDSL system current to a safety protected level, if one of the wire voltages is different by at least a predefined voltage increment related to the second wire voltage.

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First Claim