Patent ID: 7027424

Claim:
A method for transmitting information over a time duplexed communications link subject to interference from a broadband interference source, comprising: connecting a base unit communicating over the duplexed communications link to an AC power source that powers the broadband interference source; detecting a consistent timing of data packets received with errors over the communications link at regular intervals, wherein a segment B interferer is determined to be active, wherein detecting consistent timing comprises: observing a time at which the data packets are received in error, receiving phase information of the AC power source, comparing the phase information of the AC power source to the time at which the data packets are received in error, and determining that the data packets are received in error repeatedly at a consistent timing position with respect to the phase of the AC power source; switching operation of the duplex communications link to an enhanced mode, wherein active physical links between the base unit and a portable handset are assigned redundant time slots in addition to primary timeslots used for communication between the base unit and handset; and lowering a threshold for determining the segment B interferer to be active, wherein the enhanced mode is initiated after detection of a lower number of periodic errors; wherein the phase information of the AC power source is provided by an output signal of a zero crossing detector.