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echo: aust_modem
to: Bill Grimsley
from: Ian Smith
date: 1996-12-19 05:23:56
subject: X-Files modem

BG> True, but I'm still also convinced that it's protocol dependant too, as
BG> Binkley has never quite managed 4000cps on large zips with its 8Kb ZedZap.

Of course not.  Ymodem-g is hardly a fair comparison, but you're right, it
does give bigger numbers.  Useless in a mailer, where retransmision of
partial files may be necessary; it can't even survive having to resend a
single block!

RB> I think along the same lines, I am not a strong believer
 RB> that ZedZap is THE
RB> most efficient.  A lot of changes can take place in the time it takes for
RB> 8kb to go through

Not on an error-free link.

 BG> I'd have thought that the Courier's SREJ would have made a
 BG> slight difference with 8Kb blocks, but that just didn't
 BG> seem to happen.

SREJ can only make ANY difference when there ARE bad frames needing to be
retransmitted (where throughput will be down anyway).  It does absolutely
nothing on a good link, as there're no bad frames to Selectively Reject :)

Again, try seeing what difference using MNP4 makes; you should crack around
1700/1440*3360 = 3967 CPS (~118%).  MNP4 with Hydra, and you just might
roll up those 'magic' zeroes, shaving another 1% off your phonebill ..

(I've got ten fingers too, but don't understand this zero-worship stuff! :)

Cheers, Ian

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