From: Andrey Rahmatullin <wrar@altlinux.ru>
To: smoke-room@lists.altlinux.org
Subject: Re: [room] Килобит/секунду
Date: Sat, 11 Feb 2006 04:48:13 +0500
Message-ID: <20060210234813.GN23764@wrars-comp.wrarsdomain> (raw)
In-Reply-To: <20060210070700.GA4309@ldc.net>
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On Fri, Feb 10, 2006 at 09:07:00AM +0200, Dmytro O. Redchuk wrote:
> Другими словами, путаница не между бодами и битами, а между символами и
> битами?!. (или только у меня в голове?)
The concepts of bandwidth, baud, symbol, and bit rate are commonly
confused, so let us restate them here. The bandwidth of a medium is the
range of frequencies that pass through it with minimum attenuation. It is
a physical property of the medium (usually from 0 to some maximum
frequency) and measured in Hz. The baud rate is the number of samples/sec
made. Each sample sends one piece of information, that is, one symbol. The
baud rate and symbol rate are thus the same. The modulation technique
(e.g., QPSK) determines the number of bits/symbol. The bit rate is the
amount of information sent over the channel and is equal to the number of
symbols/sec times the number of bits/symbol.
Там же.
> Поэтому, скажем, 2400 бод даёт 14400 бит/сек.
Да. 2400 - символьная скорость, 14400 - информационная.
> Что есть "символ"? Именно "кусочек информации", "последовательность бит"?
См.выше.
> > Таненбаум.
> А ссылка есть куда-нить? Как он пишется по ихнему?-)
См. рядом. Я цитирую из Prentice Hall - (Tannenbaum) Computer Networks, 4ed.chm
(впрочем, искал сам текст в бумажной версии ;))
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next prev parent reply other threads:[~2006-02-10 23:48 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-06 17:15 Denis Kirienko
2006-02-06 18:00 ` php-coder
2006-02-06 18:35 ` Alexey Rusakov
2006-02-06 18:49 ` Andrey Rahmatullin
2006-02-06 18:50 ` [room] Килобит/секунду Denis Kirienko
2006-02-06 21:19 ` Alexey Rusakov
2006-02-07 10:08 ` Денис Смирнов
2006-02-07 12:21 ` Nick S. Grechukh
2006-02-08 11:20 ` [room] Килобит/секунду Maks Re
2006-02-08 12:08 ` Dmytro O. Redchuk
2006-02-08 12:14 ` Maks Re
2006-02-08 12:54 ` Dmytro O. Redchuk
2006-02-08 18:20 ` Andrey Rahmatullin
2006-02-09 7:20 ` Dmytro O. Redchuk
2006-02-09 18:33 ` Andrey Rahmatullin
2006-02-10 7:07 ` Dmytro O. Redchuk
2006-02-10 7:37 ` Maks Re
2006-02-10 7:43 ` Dmytro O. Redchuk
2006-02-10 8:49 ` Michael Holzman
2006-02-10 23:48 ` Andrey Rahmatullin [this message]
2006-02-13 8:10 ` Dmytro O. Redchuk
2006-02-08 18:26 ` Andrey Rahmatullin
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