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- Xref: sparky comp.mail.uucp:1567 comp.dcom.modems:11177
- Newsgroups: comp.mail.uucp,comp.dcom.modems
- Path: sparky!uunet!uunet.ca!geac!zooid!ross
- From: Ross Ridge <ross@zooid.guild.org>
- Subject: Re: Maximum line latency
- Organization: ZOOiD BBS
- Date: Sat, 25 Jul 1992 20:40:42 GMT
- Message-ID: <1992Jul25.204042.26254@zooid.guild.org>
- References: <1992Jul12.040736.10614@werple.pub.uu.oz.au> <1992Jul16.164112.24985@zooid.guild.org> <1992Jul18.020912.22633@werple.pub.uu.oz.au>
- Lines: 29
-
- >I've heard rumors
- >of high latency satellite links and the like, but these are not
- >subjects I know anything about.
-
- markd@werple.pub.uu.oz.au (Mark Delany) writes:
- >You need to add at least a second for a satellite link.
-
- ross@zooid.guild.org (Ross Ridge) writes:
- >I believe CCITT standards limit the delay to only a few tenths of
- >a second. Specfically I remember that one satallite hop was ok,
- >but two satallite hops would create too long of delay.
-
- markd@werple.pub.uu.oz.au (Mark Delany) writes:
- >Well, I suppose we should be precise about what we're measuring.
- >
- >The distance between receivers for a geo-stationary is ~ 75,000km
- >giving ~ .25 of a second EM propogation time in one direction (the
- >figures are too rough to worry about medium).
-
- Ok, I've found the exact reference I was refering to, CCITT Recommendation
- G.114 says that the delay (in one direction) should be less than 0.4s.
-
- Ross Ridge
-
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- Ross Ridge - The Great HTMU l/ //
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