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- Message-ID: <314E78BD.2BB8@accutek.com>
- Date: Tue, 19 Mar 1996 09:05:01 +0000
- From: Stephen Satchell <satchell@accutek.com>
- Organization: Satchell Evaluations
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- Newsgroups: comp.dcom.modems
- Subject: Re: Please Explain Octets
- References: <4ii0aa$n8f@news-e2b.gnn.com> <4iil3l$jgn@maverick.tad.eds.com> <4ijfce$2d3e@navajo.gate.net> <DoGopu.FE7@freenet.carleton.ca>
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- The entire discussion of "byte" versus "octet" goes a little deeper than that.
- A "byte" is the amount of computer storage required to store a single graphic
- (like a character) in the native mode of the machine. (Don't quote Harry
- Newton at me, his definition is wrong.) So a byte can consists of from six bits
- (the IBM 1401, DEC PDP-8) to nine bits (DEC PDP-10) or more. The ASCII
- character set can be represented in 7 bits, but I don't know of any computer
- that defined its byte as 7 bits long -- because who wants a 14- or 21-bit
- computer?
-
- The octet is more narrowly defined: a group of exactly 8 bits.
- That's why you see "octet" used in many telecommunications standards today.
-
- ---
- Stephen Satchell, Satchell Evaluations
- Testing modems and telecomm gear for magazines since 1984
-
- Luc Bellavance wrote:
- >
- > doug haire (dhaire@gate.net) writes:
- > > Michael S. Berlant (lnsg1.miberl01@eds.com) wrote:
- > > : In article <4ii0aa$n8f@news-e2b.gnn.com>, PTHarn@gnn.com says...
- > > :
- > > : >Could someone explain the term octets? When I check the details of a
- > > : >communications session the data refers to blocks and octets.
- > > :
- > > : An octet is a string of 8 bits. You may be tempted to call this a byte, but
- > > : don't. A byte is the amount of bits that a processor handles at one time,
- > > : which is typically also 8 bits. Telexes use characters that are 5 bits big,
- > > : IATA uses characters that are 6 bits big, PCs use characters that are 8 bits
- > > : big, but transfer characters that are 7 bits big.
- > >
- > > Two things:
- > >
- > > I understood "byte" to be a term that IBM coined for an octet.
- > > And...
- > > I also understood a "word" to be the amount a processor can process. (an
- > > 8 bit processor, like a Z80, handles 8 bit words while a 16 bit
- > > processor, like an 8088, handles 16 bits at a time).
- > >
- > Octet is Byte in French.
-