Modem capacity and pppstats

[Matthew J Brodeur]

On Sat, 24 Jul 1999, Subba Rao wrote:

> There are many times where it averaged, for a minute or so, at 10K bytes
> to 15K bytes per second. That means, the modem capacity is at 80Kbps
> to 120Kbps.
> 
> How can this be possible? The output is higher than the physical limit
> of the modem. Does ppp use compression and the output of pppstats,
> is the uncompressed output?


   Yes, the modem should be doing compression, and PPP can do compression
depending on the setup.  I'm not sure what pppstats reports, though.
   As far as the modem is concerned, you'll probably never see a higher
throughput than 115,200 bps, if it's on a serial port.  Last time I
checked that's the fastest those ports will go, so that's the speed at
which the modem actually talks to the computer.


Matthew J. Brodeur, mbrodeur at NextTime.com
Hostmaster, Webmaster for NextTime.com, NextTime.org
http://www.NextTime.com

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