Date: Wed, 16 Aug 2000 22:38:11 +0200 From: Poul-Henning Kamp <phk@critter.freebsd.dk> To: "Rodney W. Grimes" <freebsd@gndrsh.dnsmgr.net> Cc: imp@village.org (Warner Losh), joe@pavilion.net (Josef Karthauser), brian@FreeBSD.org (Brian Somers), cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/usr.sbin/ppp i4b.c Message-ID: <53884.966458291@critter> In-Reply-To: Your message of "Wed, 16 Aug 2000 13:17:01 PDT." <200008162017.NAA15442@gndrsh.dnsmgr.net>
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In message <200008162017.NAA15442@gndrsh.dnsmgr.net>, "Rodney W. Grimes" writes : >> : > ISDN B channels have a bandwidth of 64000, not 65536 >> : >> : Are you sure? It's supposed to be 64k (k = 1024). >> : How technically does 64000 work? >> >> 64k is 64000 in telco speak about bandwidth, always. k == 1000 and M >> == 1000000 when you are talking to telco types (also 10M ethernet is >> 10000000). > >Actually it isn't the telco types at all. Actually it *is* telco types :-) The right interpretation is: 8 x 8000. A "DS0" channel is a byte synchronized channel transferring 8000 bytes per second. This is the smallest component of the "old" telco hierarchy: DS0 - [ET]1 - [ET]2 - [ET]3 ... About the only thing carried into the SoNet days is the 8000 Hz basic unit rate. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD coreteam member | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message
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