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- From: stangel@sparc3.cs.uiuc.edu (Mike Stangel)
- Subject: Re: Q: Are the Baud Rate and BPS same?
- Message-ID: <1992Aug29.161637.9852@sunb10.cs.uiuc.edu>
- Sender: news@sunb10.cs.uiuc.edu
- Organization: University of Illinois at Urbana-Champaign
- References: <1992Aug28.155701.218@news2.cis.umn.edu>
- Distribution: usa
- Date: Sat, 29 Aug 1992 16:16:37 GMT
- Lines: 39
-
- smahn@vx.cis.umn.edu (Seokmin Ahn) writes:
-
- >Hi! netters,
-
- (Hi...)
-
- >The advertisement about modems confused me about Baud rate and BPS.
-
- >Would someone please clear up this for me ?
-
- I hope someone will correct me where I'm misleading, but I'll take a
- stab at it --
-
- Bits per second is something most of us understand; a bit is a 1 or a
- 0, and eight of them make a byte, or a character. Normal modem trans-
- missions will have anywhere from 7 - 9 bits per character. N/8/1 has
- become somewhat of a standard: No parity bit, 8 bits/character, 1 stop
- bit, for a total of 9 bits transmitted for every character received.
-
- Baud is defined as symbols per second. Some protocols, such as QAM
- (Quadriture Amplitude Modulation) make a "constellation" of symbols,
- where the symbol received is somewhere on an X-Y axis. It's not im-
- portant to discuss this in detail, except to say that it may require
- more than one bit/symbol, and that 2400baud modems use QAM -- it's
- called the V.22 protocol.
-
- This latter paragraph is technically correct, although I believe most
- ads will say "baud" and then give you a BPS figure. I don't think I've
- ever seen an ad where what they advertise as "baud" is actually symbols
- per second.
-
- Hope this helps,
-
- Mike Stangel
- --
- Mike Stangel -- stangel@uiuc.edu | "I can't kill the man I love."
- Chairman | "Then kill the one you're with."
- ACM at UIUC | -Crow, MST3k
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