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Date: Wed, 3 Sep 1997 19:07:46 -0500 (CDT)
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From: Tony Kimball <alk@pobox.com>
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Subject: Re: Anyway to get connect speed with usermode ppp/tun0 device? 
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> The only meaningful way to determine your link's characteristics is to 
> measure your throughput and latency on a continuous basis.

You could issue an escape code, query the status registers, and issue
the command to return to carrier operation.  But I suppose
'meaningful' is a very subjective term.