From owner-cvs-all  Wed Aug 16 13:38:47 2000
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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 
In-Reply-To: Your message of "Wed, 16 Aug 2000 13:17:01 PDT."
             <200008162017.NAA15442@gndrsh.dnsmgr.net> 
Date: Wed, 16 Aug 2000 22:38:11 +0200
Message-ID: <53884.966458291@critter>
From: Poul-Henning Kamp <phk@critter.freebsd.dk>
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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.


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