A solder system includes a lead indicator and a solder flux. A method for controlling the operation of at least one expansion card with an integrated controller having a plurality of readers includes detecting the presence of at least one expansion card, and enabling a selected reader of the integrated controller associated with at least one expansion card. By configuring the structure to have interconnection pad supports at only a limited number of pad periphery points, a cured soldered connection can absorb mechanical stresses associated with divergent movement between a connecting wire and the interconnection pad. A maximum bit rate for the transfer of information, which is directly related to the derived composite SNR, is then determined. The cell may further resolve conflicts that arise between several cells based on the granting of restriction of the precoding matrix.