Re: [chrony-users] GPS/PSS hardware

[Nicolas Embriz <nbari@xxxxxxxxxx>]

Hi, thanks for all the comments feedback, I am thinking on building something like this: https://nguvu.org/pfsense/ntp/ntp-server/#Hardware%20requirements with an ODROID-C2. 

Regarding the configuration, how do you configure your pool of servers?

You use something like

    server your-ip-2 iburst prefer

    server your-ip-3 iburst prefer

    server us.pool.ntp.org

Or how you keep them sync, all the clients will use server my-pool.tld but wondering mainly about the servers it self.

Thanks in advance..

Regards.

On Tue, May 8, 2018 at 7:15 PM, Alan Scott <project.director@xxxxxxxxx> wrote:

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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