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- To: chrony-users@xxxxxxxxxxxxxxxxxxxx, Bill Unruh <unruh@xxxxxxxxxxxxxx>
- Subject: Re: [chrony-users] GPS/PSS hardware
- From: Alan Scott <project.director@xxxxxxxxx>
- Date: Tue, 8 May 2018 10:15:17 -0700
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Yes, this is totally possible and the equipment ect. does exist.....but
what may I ask is the difference between hooking equipment "x" up to
your server and having a raspberry PI attached to it......?
You are still going to have to hook up some equipment regardless,
correct...or am I missing something....
I have the exact build you describe from uptronics below, (although I
use the newer much smaller GPS they have on offer) and it works very
well.....
remote refid st t when poll
reach delay offset jitter
=======================================================================================================
*SHM(1) .PPS. 0 l 9 64 377
0.0000 -0.0685 0.0399
xSHM(0) .GPS. 0 l 9 64 377
0.0000 -112.395 1.3963
us.pool.ntp.org .POOL. 16 p - 64 0
0.0000 0.0000 0.0019
-mtpbx.cytranet.net 198.60.22.240 3 u 78 128
377 21.2007 -1.7077 1.8072
+bedast01.beausteward.com 129.7.1.66 2 u 30 64 375
41.9868 -0.2644 1.0297
+li216-154.members.linode.com 45.56.123.24 3 u 63 64
376 40.1422 1.1676 1.1980
-resolver2.skyfiberinternet.com 216.218.254.202 2 u 5 128
377 31.1699 2.4556 0.9245
-ns3.weiszhosting.com 128.138.141.172 2 u 80 128
377 38.9460 4.6676 0.6918
-atl0.fairy.mattnordhoff.net 128.59.0.245 2 u 37 128
377 61.9936 1.1824 2.1731
-triton.ellipse.net 66.220.9.122 2 u 28 64
375 59.9884 -1.8464 1.3485
If you have any questions about my setup I would be more than happy to
answer but for around $100 usd it's hard to beat....
Alan
On 05/08/2018 06:06 AM, Bill Unruh wrote:
On Tue, 8 May 2018, Nicolas Embriz wrote:
Hi, I would like to build/test a stratum-1 server, I have found
articles about how to do that with a raspberry PI and boards
like https://store.uputronics.com/index.php?route=product/product&path=60_64&product_id=81
But wondering if there is hardware/devices that could be attached via
USB and connect to an existing server.
USB is possible but not ideal. The interrupts are soft interrrupts (ie
done by
sending signals on the usb in software rather than some hardware
line.) Best
is if your system has some hardware line (eg serial port or parallel
port) to
use. Of course that depends on what kind of accuracy you want. If it
is ms
then a serial to usb converter will certainly work, and even just the GPS
signal on the usb might be fine. If it is sub-ms you want, then a
hardware
interrupt is needed.
Or your desktop server might already have a serial port, and you can
use that.
Any recommendations?
Thanks in advance.
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