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[activities] Offer of talk: GPS and precision time transfer under Linux.
- To: "SLUG Activities List" <activities@xxxxxxxxxxx>
- Subject: [activities] Offer of talk: GPS and precision time transfer under Linux.
- From: "Mark Willis" <willism@xxxxxxxxxxxxxx>
- Date: Fri, 25 Mar 2011 12:36:25 +1100
- User-agent: Gnus/5.110006 (No Gnus v0.6) Emacs/21.4 (gnu/linux)
I would like to volunteer to talk about time transfer and
precision timing under Linux/Unix.
I propose to split the topic into three parts:
The first two parts are ready to go given a little notice.
1. Time distribution systems and hardware
- choice, limitations, and installation.
Aimed at the level of the old SLUG main general talk.
Covers a lot of detail on the requirements & trade offs:
a. Reasons for precision timing such as regulatory
b. Options and choice of time distribution system.
c. GPS(L1,L2C,L5) and other satellite timing systems.
(GLONASS, Galileo, Beidou/Compass, QZSS and MSAS/WAAS)
d GPS receiver choices.
e. Supporting hardware - antennas and interface boards.
f. Connecting a receiver to your computer.
g. Limits in computer time synchronisation
The coverage of GPS and other satellite systems should be
interest to any one who uses GPS for navigation.
I would very much prefer that these two talks would be
separated by at least a month. This allow people who attend
the first talk, to purchase a GPS receiver if they want to.
2. Pulse Per Second(PPS) support with LinuxPPS and NTP.
- including coverage of general computer timing hardware.
Aimed at the level of the old SLUG in depth talk.
LinuxPPS is a kernel time-stamping implementation that
has only recently been merged into the mainline kernel.
Even so it is still fiddly to setup and there are a few
catches to get everything working.
a. Why PPS signals?
b. PPS signal formats.
c. Hardware Time-stamping
d. Why kernel time-stamping is both good and bad.
e. PPS kernel configuration
f. Userland configuration
f. Supporting programs.
g. Computer hardware modifications for
h. Modern time-stamp stamp counters (invariant TSC, HPET,
ACPI, PIT and RTC)
3. Monitoring hardware, kernel and NTP performance.
- letting the world monitor your NTP server by
contributing to pool.ntp.org
Lots of pretty pictures, a few timing statistics, a
little control theory, a look at network settings and
NTP. Comparison of the various NTP daemons (good and bad
and the ugly).
If people are interested in these talks I would prefer it if
I have a month notice so that I can keep the final Friday free.