Geof Cooper (imagen!apolling!geof@decwrl.DEC.COM)
Tue, 24 Mar 87 13:39:06 pst
> In article <8703220422.AA13307@buita.bu.edu> firstname.lastname@example.org.EDU writes:
> > From: Scott Earley < > > From: Scott Earley <EARLEY@BITNIC>
> > ... Tables
> > for all sites on the Ohio side of the PSU-Ohio link will be put
> > on tape and mailed overnight to a pre-appointed individual who
> > will reintroduce them into the network from there.
> > ...
> >That's right. Mag tape.
> Never underestimate the bandwidth of a station wagon full of magtapes!
Well, we can't resist this, can we. Back of the envelope calculations
for a station wagon full of bits transmitted from the east coast to the
west coast follow. Apologies for any naivitee about magtapes -- I don't
use them often and never learned all the sordid details.
Station wagon: 5' X 5' X 3' trunk
Transit time: 4 days = 345 600 s
(might add a day on each side to copy the data to & from tape)
1 magtape, 12"X1" reel, 1000' of tape, 9600 bpi, 9 tracks
=> 12*1000*9600*9 = 129.6 E 6 bits
5*5*36 = 875 magtapes in trunk
=> 875*129.6 = 113.4 E 9 bits
113.4e9 b / 345600 s = 328,125 b/s
Hmm.... better than the arpanet.... how much does a station wagon
cost these days, anyway...
Corrections welcome (they might as well be, I'm sure there will
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