[time-nuts] z3801a, z3805a, z3815a, z3816a, thunderbolt and thunderbolt

bg at lysator.liu.se bg at lysator.liu.se
Wed Nov 30 16:56:42 EST 2011


Hi Justin,

> There are some issues using a Thunderbolt with NTP.  See
> http://www.eecis.udel.edu/~mills/ntp/html/drivers/driver29.html (the stuff
> about event polling).

The Trimble Palisade (aka Acutime, Acutime 2000, Acutime Gold) has a nice
feature called Event input.

"Event input
The Acutime Gold accepts an external event input in the shape of an RS-422
pulse. The external event pulse input is supported on Port A (pins 6 and
7). The Acutime Gold transmits a TSIP time packet (0x8F-0B or 0x8F-AD) in
response to the event input. The TSIP packet increments the event count
field for each event received. The event time stamp is generated within
488 nanoseconds of its arrival at the Acutime Gold interface connector."

The prefered mode for the palisade driver is to use this feature. When the
driver was adapted for Thunderbolt is was seen as a problem that the Tbolt
receiver lacked the "Event input".

I have not runt a Tbolt with NTP, but it should be very doable with the
Palisade driver in the "Thunderbolt"-mode. Another option could be the
Parse-driver

    http://www.eecis.udel.edu/~mills/ntp/html/drivers/driver8.html

running in the Trimble TSIP mode. (mode 10)

--

    Björn






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