Re: [TCLUG:15037] Station Wagon Full of Tapes

["Carl Wilhelm Soderstrom" <carls@agritech.com>]

>>((1.5 * 1000 * 1000) / 8 * 60 * 60 * 24) / (650 * 1024 * 1024) =3D
>>23.76849834735576923076
>>
>> So, that's 24 CDs.
>
>Perhaps he meant the speed of a USWest T1 line, and not a normal
>T1 line.  If we were comparing against a USWest line, my money is
>on the good folks at Fed-Ex.

ok, so I guess my recollection was wrong. (hey, it was 4 years ago! and I
probably ceremonially burned the notes it was written on as well..)

        but Nick is right... real world T-1s don't move 1.5Mbps of actual
data... up to half of that figure (depending on situation) can be
communication overhead.
        then again, burning CDs takes time as well. :)

actually, just realized that I have a copy of Mr. Tanenbaum's "Computer
Networks - Third Edition" within arm's reach here. :)
        unfortunately, the index makes mo mention of "bandwidth", "station
wagon", or "tapes"; so I did a grep with a Mark 1 eyeball; and found the
quote in question on p. 83 (in Sec. 2.2). :)
        the accompanying paragraph talks about moving 1000 7GB tapes (or in
today's terms; 100 70GB tapes) by Fed-Ex, in 24 hours. this gives a
bandwidth of 648Gbps. :)

Carl Soderstrom
System Administrator    307 Brighton Ave. 
Minnesota DHIA	        Buffalo, MN	
carls@agritech.com      (612) 682-1091