A base station and method for use in a wireless system are provided. In general, the virtual peer is a logical construct enabling a number of virtual peer members to appear as a single peer node in the P2P network. The board holder and the card connector cover are positioned in at least two directions perpendicular to the direction in which the memory card is inserted and pulled out. A first filtering means is provided to extract parameters related to the patient’s respiration from beat-to-beat variability in the IEGM signal classification while filtering away slow classification variability extending over several cardiac cycles.