An optical wiring switching unit includes a first connection interface. During an initial enrollment mode, pulse wave and spirometric data for a known subject are used to generate subject characterization data for the known subject. If the currently encoded are gap regions or sector having repeated data embedded in the fields of user data, only those portions affected by the modified header will be encoded to derive associated P code and Q code. The method and the system also provide continuous, cross-apparatus and cross-channel video replay.