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Re: And we thought the text part of the Starr Report would be bad
- From: Miquel van Smoorenburg
- Date: Mon Sep 21 16:35:17 1998
- Distribution: cistron
- Newsgroups: lists.nanog
In article <199809182139.RAA10174@us.net>, David Stoddard <email@example.com> wrote:
> There is more to this than meets the eye -- 28.8K is asynchronous
> and has start and stop bits for every byte, so there are a maximum
> of 2880 bytes/sec available over 28.8K. Then there is the issue
Almost every modem supports V42 error correction, which makes the modems
speak a sort of synchronous with each other (actually data is transmitted
in blocks with a start-of-block and end-of-block marker, and a checksum).
That gets you 8 bits in a bith minus some negligeble V42 overhead.
So an 28k8 modem can actually transfer almost 3.6 Kbytes/sec.
Because of the block-oriented approach you do get a bit higher latency
on interactive connections, which is why gamers often turn of V42.
Somehow, nobody seems to know this.
"Did I ever tell you about the illusion of free will?"
-- Sheriff Lucas Buck, ultimate BOFH.