This International Standard determines the logical structure of using dedicated short-range communication (DSRC) with an OSI (open systems interconnection) application layer as a CALM medium for IP communications. DSRC to which MAIL is applicable are those with an application layer compliant with ISO15628, and the standards of such DSRC include the following: ARIB STD-T75 DSRC (Japan); TTAS.KO-06.0025 DSRC in the 5,8GHz band (Korea); EN12253 DSRC physical layer using microwave in the 5,8GHz band, EN12795 DSRC data link layer and EN12834 DSRC application layer (Europe). Figure1 shows the architecture of the MAIL, which can be considered as a specific extension of the communication adaptation layer (CAL) specified by ISO21218. Figure1 CALM MAIL in CALM architecture NOTE In furnishing additional information on CALM MAIL, reference can be made to ARIB STD-T88 (DSRC application sub layer).