-=> Quoting MIKE FARRILL to RICK COLLINS <=-
-=> FidoMail to 1:163/215, please.-=<
-> 2) Max modem-modem throughput at 33,600, with error correction is
-> 4200 bps.  EC overhead reduces this to the 4000 cps range.
mf> Is the EC overhead you are refering to come from the use of the
mf> Zmodem protocol? Y-modem-g is always faster. And also, he
mf> could be using the 512k lap-m packet size which would give more
mf> performance. 
The EC overhead I was referring to was that imposed by LAPM or MNP 4. 
The size of the packet doesn't matter - no matter how big it is it
will contain extra data for the purposes of managing the packet. 
Naturally, the larger the packet, the smaller the _percentage_ of
each packet that is "non data", but you will not _exceed_ the maximum
rate of the channel even if you reduce the overhead to zero.
A "perfect" channel, using 8 bytes per char and no packet overhead
(which, of course, is not possible) would give 33600/8 = 4200 bps,
somewhat less than the 4500 bps claimed.
Similarly, Zmodem or YModem-g won't change that.
TTFN. Rick.
Ottawa, ON 6 Apr 21:33 
--- Blue Wave/DOS v2.20
---------------