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Encyclopedia > Octet (computing)

In computing, an octet is a grouping of eight bits. RAM (Random Access Memory) Look up computing in Wiktionary, the free dictionary. ... This article is about the unit of information. ...


In France, French Canada and Romania, the word octet usually means byte; a megabyte (MB) is called a megaoctet in France, Romania and also French Canada. "Bit" and "byte" are homophones in the French language. This is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. ... For the computer industry magazine, see Byte (magazine). ... This article is about the term in linguistics. ...


Octet, with the only exception noted below, always refers to an entity having exactly eight bits. As such, it is often used where the term byte might be ambiguous. For that reason, computer networking standards almost exclusively use octet. It is prominently used in Request for Comments (RFCs) published by the Internet Engineering Task Force. The earliest example is RFC 635 from 1974. For the computer industry magazine, see Byte (magazine). ... In internetworking and computer network engineering, Request for Comments (RFC) documents are a series of memoranda encompassing new research, innovations, and methodologies applicable to Internet technologies. ... The Internet Engineering Task Force (IETF) develops and promotes Internet standards, cooperating closely with the W3C and ISO/IEC standard bodies; and dealing in particular with standards of the TCP/IP and Internet protocol suite. ... Year 1974 (MCMLXXIV) was a common year starting on Tuesday (link will display full calendar) of the 1974 Gregorian calendar. ...


Normalization

Octets can be used with SI prefixes or the power of 2 prefixes as standardized by the International Electrotechnical Commission in 1998. An SI prefix (also known as a metric prefix) is a name or associated symbol that precedes a unit of measure (or its symbol) to form a decimal multiple or submultiple. ... // In computing, binary prefixes can be used to quantify large numbers where powers of two are more useful than powers of ten (such as computer memory sizes). ... The International Electrotechnical Commission (IEC) is an international standards organization dealing with electrical, electronic and related technologies. ... Year 1998 (MCMXCVIII) was a common year starting on Thursday (link will display full 1998 Gregorian calendar). ...

  • kibi for « kilo binary » ;
  • mebi for « mega binary » ;
  • gibi for « giga binary » ;
  • tebi for « tera binary » ;
1 kibioctet (Kio) = 210 octets = 1,024 octets
1 mebioctet (Mio) = 220 octets = 1,024 Kio = 1,048,576 octets
1 gibioctet (Gio) = 230 octets = 1,024 Mio = 1,073,741,824 octets
1 tébioctet (Tio) = 240 octets = 1,024 Gio = 1,099,511,627,776 octets
1 pebioctet (Pio) = 250 octets = 1,024 Tio = 1,125,899,906,842,624 octets
1 exbioctet (Eio) = 260 octets = 1,024 Pio = 1,152,921,504,606,846,976 octets
1 zebioctet (Zio) = 270 octets = 1,024 Eio = 1,180,591,620,717,411,303,424 octets
1 yobioctet (Yio) = 280 octets = 1,024 Zio = 1,208,925,819,614,629,174,706,176 octets

The SI prefixes kilo, mega, giga, tera, etc., stay the same as for all the SI units, based on power of 10. In this case: Look up si, Si, SI in Wiktionary, the free dictionary. ... Look up si, Si, SI in Wiktionary, the free dictionary. ...

1 kilooctet (ko) = 103 octets = 1,000 octets
1 megaoctet (Mo) = 106 octets = 1,000 ko = 1,000,000 octets
1 gigaoctet (Go) = 109 octets = 1,000 Mo = 1,000,000,000 octets
1 teraoctet (To) = 1012 octets = 1,000 Go = 1,000,000,000,000 octets
1 petaoctet (Po) = 1015 octets = 1,000 To = 1,000,000,000,000,000 octets

Exception

The term "permission octet" is sometimes used for the group of basic permission bits (read, write, execute) of many file systems for Unix-like platforms. As these three bits can represent 8 different values octal notation is also used. The correct term "permission triplet" is also common though. Most modern file systems have methods of administering permissions or access rights to specific users and groups of users. ... For library and office filing systems, see Library classification. ... Diagram of the relationships between several Unix-like systems A Unix-like operating system is one that behaves in a manner similar to a Unix system, while not necessarily conforming to or being certified to any version of the Single UNIX Specification. ... Most modern file systems have methods of administering permissions or access rights to specific users and groups of users. ...


Origin

The word octet (meaning "group of eight") comes from the Latin and Greek numerical prefix octo, meaning eight. For other uses, see Latin (disambiguation). ... A numerical prefix is a prefix that denotes a number, which is usually a multiplier for the thing being prefixed. ... Octo- (or oct before a vowel) is a Latin numerical prefix meaning eight. ...


 
 

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