[ntp:questions] Thunderbolt at NTP ref clock.

Thomas Laus lausts at acm.org
Wed Jul 31 12:58:38 UTC 2013


On 2013-07-30, E-Mail Sent to this address will be added to the BlackLists <Null at BlackList.Anitech-Systems.invalid> wrote:
> Dave Baxter wrote:
>> In reference to my other thread.
>> "THunderbolt monitor/control on Win7 ?"
>> Well, as that device seems happy in it's potential new home.
>> I've been poking about the interweb looking for info as to getting the
>> TB used as a reference clock for NTP.
>> I found this page:-
>> http://www.eecis.udel.edu/~mills/ntp/html/drivers/driver29.html
>> That on the face of it, seems to tell me what I need.
>> So, poking arround (no changes yet) my ntp.conf file, I "think" I need
>> this:-
>>
>> # Trimble Thunderbolt on /dev/gps1 (first serial port)
>> server 127.127.29.1 mode 2  minpoll 4 maxpoll 4   prefer
>> fudge  127.127.29.1 time1 0.020
>
Years ago when I used a Thunderbolt to provide a local time reference
on a Soekris system I found that the PPS pulse was a little too narrow
to trigger the Soekris UART.  I had to use one of these:

http://www.tapr.org/kits_fatpps.html

To stretch the pulse for reliability.


Tom


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