Reference clocks.

[Gary E. Miller]

Yo Dan!

On Tue, 3 May 2016 21:41:49 -0500
"Dan Poirot" <dtpoirot at gmail.com> wrote:

> USB 1.1 is good enough! 

Better than a network time source, but not as good as I want.  I can get
8x better jitter with USB 2.0.

> You got a jitter or latency problem you can't solve with 12 Mbit/sec,
> rock-solid on a point-to-point link?

It may be 12Mbit/sec, but DCD is only sampled about every milliSec.

I'd like to approach the jitter of a PPS over serial.  The hard numbers
aer:  USB 1.1 is +/-1 milliSec, USB 2.0 gets me +/- 125 microSec.

Direct PPS down to maybe a few microSec.

RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
	gem at rellim.com  Tel:+1 541 382 8588
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