🚀 go-pugleaf

jeff@amikoj.rn.com (Jeff Kunce) writes:

> FURTHER IMPROVEMENT:
>   From what I hear, I am convinced that, if you use a uucp protocol with
> larger packets (like 7x512 "G"), V.42bis compression *does* increase
> throughput. I have not had the time to verify this (patch the uucico,
> arrange things with my feed, etc.)

  Actually, there is still no actual compression taking place. You'd get the
same 1600+ cps under MNP4 or v42. The fact of turning on error correction
reduces the number of bits that needs to be sent.

  A normal connection requires 10 bits/byte (1 start, 8 data, 1 stop). Under
MNP/v42, the start and stop bits are not used, and several bytes of data are
'combined' into packets. Every 8 bits in the data packet is called an octet.
This alone would give a 20% speedup. The actual speedup is slightly less due
to the headers needed to define and error-check the packets.

  This is for the data actually sent between the modems. The modems will
'convert' the data to the standard 10 bits when it talks to the computer.



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