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- Path: dispatch.news.demon.net!demon!bram-sys.demon.co.uk
- From: pete@bram-sys.demon.co.uk (Pete Jones)
- Newsgroups: comp.dcom.modems
- Subject: Re: Modem gurus.....I could use some help !!
- Date: Sun, 10 Mar 1996 08:17:45 GMT
- Organization: Bramble Software
- Message-ID: <31428f4b.791359@news.demon.co.uk>
- References: <4hhjav$3du@shell.fore.com> <4hnm7s$jbk@dsm6.dsmnet.com> <3140b7b4.1272996@news.demon.co.uk> <4hr0p6$bci@nntp1.best.com>
- Reply-To: pete@bram-sys.demon.co.uk
- NNTP-Posting-Host: bram-sys.demon.co.uk
- X-NNTP-Posting-Host: bram-sys.demon.co.uk
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-
- Rigor@clever.net (Matt Fox) wrote:
-
- >In article <3140b7b4.1272996@news.demon.co.uk>, pete@bram-sys.demon.co.uk
- >says...
- [snip]
- >>I am a little bit concerned about the above. You talk about 28.8K
- >>modems being capable of 115K. My understanding is that the speed of a
- >>modem is given in "bits per second" so a 28.8K modem is able to
- >>transmit data at a maximum of 28.8Kb/s.
- >>
- >
- >its a little bit over 28.8kb/s due to mnp4/v42 stripping out start and
- >stop bits out of the data connection. they [the modem advertisers] keep
- >advertising modems with outragous compression ratios, thats where you
- >get the 115kb/s, where the truth is almost everyone uses some kind of
- >zip/arj compression.. no one in the real world downloads plain ascii
- >text, and in order to reach the theroritical compression ratio you
- >hafto be downloading a really really huge text file with just the
- >letter A repeated over and over.. its never that high with real data
-
- OK, point taken 115k with compression.
-
- Marketing speak dosn't use the 7 layer model does it, I am speaking
- with a developers hat on, & our modems don't compress, they modem. A
- higher layer will probably do the compression for us.
-
- Pete
-
-