-> 2) Max modem-modem throughput at 33,600, with error correction is
-> 4200 bps.  EC overhead reduces this to the 4000 cps range.
Is the EC overhead you are refering to come from the use of the Zmodem
protocol?  Y-modem-g is always faster.  And also, he could be using the
512k lap-m packet size which would give more performance.
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