A system for amending implementation instructions for any number or combination of Emergency Auxiliary Services, the Emergency Auxiliary Services being effected according to the implementation instructions regarding at least one predetermined receiver after a triggering communication is placed from a subscribing communication instrument includes: A change ordering means for effecting the amending. The acquisition distribution layer is located between the topsheet and the absorbent core material. The channel estimator generates one first channel frequency response for each OFDM symbol when operated in the first mode, and generates the channel frequency responses of a second channel frequency response for every N-th OFDM symbols when operated in the second mode, wherein N is a constant integer exceeding one and j is a non-negative integer.