ISO IEC 17982:2021 pdf download – Information technology — Telecommunications and information exchange between systems — Close capacitive coupling communication physical layer (CCCC PHY). 4 Conventions and notations The following conventions and notations apply in this document. — A sequence of characters of ‘A’, ‘B ’, ‘C ”, ‘D, ‘E ’ or ‘F ’ and decimal digits in parentheses represent numbers in hexadecimal notation unless followed by a ‘b’ character. — Numbers in binary notation and bit patterns are represented by a sequence of 0 and 1 digits or ‘X ’ characters in parentheses followed by a ‘b’ character, e.g....