[ntp:questions] NTP on red hat 7.3, was precision can be expected

Steve Kostecke kostecke at ntp.isc.org
Fri Jun 22 02:18:26 UTC 2007

On 2007-06-22, Richard B. Gilbert wrote:

> Rejean wrote:
>> On Jun 21, 5:14 pm, "Richard B. Gilbert" wrote:
>>>Rejean wrote:
>>>>I'm trying to use NTP 4.2.0 with red hat 7.3 and a military GPS on a
>>>>Pentium 1.4 Ghz board.

"military GPS" is meaningless. What is the make and model and what
driver are you using?

>>>>If I compare the Linux Time with the GPS time using a oscilloscope.
>>>>At start time I was getting a time difference of about 20ms then
>>>>after 6h linux time was 150ms ahead. Can i expect to have a time
>>>>precision to +/-20ms whithout the PPS.

That depends upon the type of GPS it is.

>>>There's no way we can answer that without knowing more about the GPS
>>>and how time is being transmitted to the Linux system!
>> The GPS is connected through the serial port at 9600 bps And the
>> ntp.conf is setup to read it.

Please tell us the make and model of this GPS. And post your ntp.conf
(omitting the lines that are commented out).

Steve Kostecke <kostecke at ntp.org>
NTP Public Services Project - http://support.ntp.org/

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