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echo: hs_modems
to: RICHARD TOWN
from: MIKE FARRILL
date: 1997-04-17 08:49:00
subject: 4400cps on a 33600/3

-> Link Access Procedures for Modems - we only get the cheeep end of the
-> market - 128 byte or 128 byte with Selective REJect on budget modems,
-> 244 (256 in reality?) on more expensive.  There's some with 512
-> around, but not really in hobbiests' price range.
I guess the courier has the 512 byte block (it better for that price :)
-> If you've got purrfect lines to your remote then MNP4's best since on
-> both budget and not-so-budget modems that's available with a 256 byte
-> packet size.  It's also got less overhead than either version of
-> LAP-M.  But just one BLER (BLock ERror) and the whole 256 will have
-> to be sent again
Well, Lines aren't that great around here.  I've seen one 31200
connect (That was the receive rate 26400 was the send rate) but it
dropped seconds later.
-> As far as data compression is concerned, the best is NONE.  And fully
-> compress the data your transferring with an uptodate compressor such
-> as UC/2.  Also, switch compression off when transferring
-> pre-compressed files since an effect called "zero-stuffing" accounts
-> for the slight decrease in apparent effective thruput noticed
How much does this zero stuffing affect cps?
-> If by better you mean better for maintaining a higher thruput on duff
-> lines then, in the absence of LAP-M with SREJ, MNP10's good, since
-> it'll go down to 8 byte resends.  But it does carry more overhead...
I thought that MNP10 was a cellular protocol.
--- Platinum Xpress/386/Wildcat! v1.3
---------------
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