An octet is a group of eight bits
that are transmitted, switched or processed together (e.g. PCM data word), but which do not necessarily have to have anything to do with each other. The term octet originates from the CCITT and is used synonymously for the byte
, whereby a byte can also differ from eight bits, whereas the octet always consists of eight bits. In addition, the bits of a byte form a unit, for example anASCII character
. Thebyte is mainly used for memory sizes. The octet is used
bits inaddition to the user data
. Octets represent 256 (2exp8) values, which can be written in binary, hexadecimal or decimal notation. Likewise, octets can be divided into two nibbles of four bits each.