What is the EMVCo position on data transmission speeds and Protocol Parameter Selection (PPS)?
ISO allows variation of data transmission speeds by adjustment of the Clock Rate Conversion Factor (F) and the Bit Rate Adjustment Factor (D) – these parameters are returned in character TA1 in the Answer to Reset. EMV does not specifically support variation of F (F=1 is always used in EMV) though values other than 1 are not forbidden for proprietary use. For D however, values of 2 and 4 (allowing doubling and quadrupling of the data transfer rate respectively) are supported as well as the basic value of 1. EMV version 4.2 June 2008 states in Book 1 section 8.3.3.1 (TA1) that if TA1 is present in the ATR (indicated by b5 of T0 set to ‘1’) and TA2 is returned with b5=’0′ (specific mode, parameters defined by the interface bytes), the terminal shall accept the ATR if the value of TA1 is in the range ’11’ to ‘13’ (D of 1, 2 or 4). Therefore, terminals shall accept an ATR in specific mode with D=1, 2 or 4. Further it states that if the value of TA1 is not in the range ’11’ to ‘13’ it shall
