[ntp:questions] Which time source is ntp using

Chip chip.from.nc at gmail.com
Thu Jul 13 00:26:45 UTC 2017


All,

How would I get my GPS clock to be withing 1/2 second of the PPS so it will be used as the be used as the primary clock reference and external sources will not be used.

Thanks

Chip


On 07/12/2017 09:37 AM, Brian Utterback wrote:
> Strictly speaking, it is using both. A PPS signal can only be used on a system clock that is within half a second of the correct time. In essence the part of the timestamp that is of a precision of one second and up is coming from the 176.9.72.17 system, while the part of the timestamp that is in fractions of a second is coming from the PPS.
>
> Hope that helps.
>
> On 7/11/2017 10:53 PM, Chip wrote:
>> All,
>>
>> I have set up a raspberry pi as a NTP server.
>>
>> The Pi is performing flawlessly.
>>
>> when I run the ntp -pn, I get the following output
>>
>>      remote           refid      st t when poll reach delay offset  jitter
>> ==============================================================================
>>  127.127.1.0     .LOCL.          10 l  27h   64    0 0.000 0.000   0.000
>> o127.127.20.0    .GPS.            0 l   58   64  377 0.000 0.007   0.004
>> *176.9.72.17     192.53.103.104   2 u   44   64  377 136.644 1.221   0.720
>> +46.254.216.9    89.109.251.21    2 u   58   64  337 177.067 0.041   2.734
>> -69.10.161.7     144.111.222.81   3 u   36   64  377 69.135 15.589   0.680
>> +96.244.96.19    192.168.10.254   2 u   46   64  377 58.373 0.809  13.308
>>
>> Is the pi using the GPS pps signal as the reference clock or the clock at 176.9.72.17 which has
>> the * infront of it?
>>
>> Thanks
>>
>>
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>
>
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Ralph "Chip" Blach
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