From: tz <tz2026@gmail.com>
To: esr@thyrsus.com
Cc: thumbgps-devel@lists.bufferbloat.net
Subject: Re: [Thumbgps-devel] Project clarification
Date: Wed, 14 Mar 2012 08:44:00 -0400 [thread overview]
Message-ID: <CAFv7OijZUmQnFrVy6L2L0i5w-o_maxDcV3XD3dY9SGHAMMWJJw@mail.gmail.com> (raw)
In-Reply-To: <20120314043258.GA26308@thyrsus.com>
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The FTDI using CTS is showing a 1mS at most jitter with my venus 638 pps
signal in my userland tests. The start bit offset is worse but the jitter
seems similar.
On Mar 14, 2012 12:32 AM, "Eric S. Raymond" <esr@thyrsus.com> wrote:
> Dave Taht <dave.taht@gmail.com>:
> > So < 5ms would be the outside goal, and anything less than that - so
> > long as it can be thoroughly catagorized - is a bonus.
>
> Yeah, that's *exactly* how I figure it, too, Nyquist's Theorem and all.
> I set 1ms as a goal because the ZTI dongle does that and I think I
> know how (jacking USB polling frequency to max), but you're right - for the
> delay tomography we can live with anything < 5ms.
> --
> <a href="http://www.catb.org/~esr/">Eric S. Raymond</a>
> _______________________________________________
> Thumbgps-devel mailing list
> Thumbgps-devel@lists.bufferbloat.net
> https://lists.bufferbloat.net/listinfo/thumbgps-devel
>
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next prev parent reply other threads:[~2012-03-14 12:44 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-13 21:46 Mike Hord
2012-03-13 23:06 ` Eric S. Raymond
2012-03-13 23:30 ` tz
2012-03-14 1:18 ` Eric S. Raymond
2012-03-14 1:10 ` Dave Taht
2012-03-14 1:28 ` Ron Frazier (NTP)
2012-03-14 1:53 ` Eric S. Raymond
2012-03-14 3:08 ` Dave Taht
2012-03-14 3:42 ` Dave Taht
2012-03-14 4:02 ` Ron Frazier (NTP)
2012-03-14 4:32 ` Eric S. Raymond
2012-03-14 12:44 ` tz [this message]
2012-03-14 2:28 ` tz
2012-03-14 2:46 ` Dave Taht
2012-03-14 3:05 ` tz
2012-03-14 4:36 ` Patrick Maupin
2012-03-14 5:00 ` Eric S. Raymond
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