Subject:
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Re: A Generic Idea
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 6 Jan 2003 20:20:48 GMT
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Original-From:
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chammers@xaosnet.com&AntiSpam&
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Viewed:
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927 times
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On Sun, 5 Jan 2003, Steve Baker wrote:
> If you just have the audio part of the phone line to play with, you can't
> do better than 56Kbaud. That's why there are no modems rated above 56K
> out there. Modem speeds increased every year or two for about 10 years
> as the electronics got more sophisticated - but for the last six of seven
> years, there has been no speed improvement over 56Kbaud - that's because
> that is the absolute limit of what an analog phone line can carry.
It's actually worse than that since 56k is only 33.6k upstream unless you
have a special line. Most ISP's have these special lines giving their
customers 53k/56k downstream. The 53k limit is an FCC thing imposed on
older modems that was lifted recently (I think). Straight analog lines can
really only carry 33.6k. This is why uploading on a 56k is slower.
Hopefully Lego will add 802.11a/b/g support to the next gen RCX :)
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Message is in Reply To:
 | | Re: A Generic Idea
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| (...) Yes - but when they install ISDN or DSL on your line, they switch out some electronics at the telephone exchange - remove some line filtering, pull out the digital part of the stream from the analog part, etc, etc. If you just have the audio (...) (22 years ago, 5-Jan-03, to lugnet.robotics)
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