This specification makes use of "C"-like notation to describe the formats of messages. Unlike the "C" language, which allows for implementation flexibility in laying out structures, this specification adopts the following rules. Multi-byte values are always transmitted least significant byte first. All fields, except "bit-fields", are aligned on the nearest byte boundary (even if longer than a byte), and there is no implicit padding. Fields using the "bit field" notation are defined to be laid out within the structure with the first-named field occupying the lowest order bits, the next named field the next lowest order bits, and so on.