[time-nuts] Serial port server .. any interest in a write up on using ?

Bob Camp lists at rtty.us
Wed May 23 21:59:57 UTC 2012


Hi

Ok, to be 1000: 1, you would take the 0.2 to 0.5 ms that you see on the LAN and take it up to 200 to 500ms. That's *way* worse than anything I have ever seen for a serial server over a LAN.

Bob

On May 23, 2012, at 5:15 PM, Chris Albertson wrote:

> On Wed, May 23, 2012 at 2:02 PM, Bob Camp <lists at rtty.us> wrote:
>> Hi
>> 
>> What ever degradation the serial stream sees on the LAN, the resulting NTP
>> output will see once it's on the same LAN. It's unlikely you will see more
>> than a 2:1 net degradation no matter what is going on. The flywheel in the
>> NTP algorithm will likely help you in this case to actually improve things a
>> bit.
> 
> Have you actually tried this and measured?  2:1 is very optimistic.
> Typically it is 1000:1 or worse
> 
> But you are right that it may not matter.  For most uses if the
> computer's clock is correct at the 0.1 second level they are happy.
> but this is a "time nut" mailing list and some of us like to get NTP
> to run at the uSecond level.  Useless as that might be.
> 
> 
> 
> Chris Albertson
> Redondo Beach, California
> 
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.




More information about the time-nuts mailing list