[ntp:questions] Trying to use Dimension 4 time keeper

Richard B. Gilbert rgilbert88 at comcast.net
Sat Sep 21 15:54:20 UTC 2013


On 9/10/2013 9:47 PM, W. eWatson wrote:
> ...
>>>>
>>>>>
>>>>> I tried Meinberg for quite some time, but it flops fairly often. As I
>>>>
>>>> flops? What are the symptoms? Also, if time is important why not invest
>>>> in a GPS (35 dolalrs or so) with PPS.
>>>
>>> It moves many seconds in a short time, say a day or two. How is GPS
>>> going to help? Does it provide access via a USB port.
>>
>> It-- which noun does that "it" point to?
>> Sure, you can have gps provide access via a usb port. The Sure GPS even
>> has a usb port on board that you can directly connect to. It is not
>> great timekeeping but you can probably get it to within .1 sec or so.
>> The main problem is that you cannot use the PPS via a usb connection, so
>> you have to rely on the timing from the nmea sentences. Run the usb port
>> as fast as possible (high baud rate), and after some observation with
>> the machine connected to the internet as well, determine what the usb
>> data time offset is and subtract it out using the time2 option to the
>> driver.
> It = GPS. What is PPS?
> ...

Pulse per second ???



More information about the questions mailing list