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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: And we thought the text part of the Starr Report would be bad
In article <[email protected]>, David Stoddard <[email protected]> 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. Mike. -- "Did I ever tell you about the illusion of free will?" -- Sheriff Lucas Buck, ultimate BOFH.
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