[ntp:questions] Root Dispersion of NTP server with PPS

Mauro Fiacco Mauro.Fiacco at ipaccess.com
Wed Jun 21 13:56:08 UTC 2006


Hello All,

I have an NTP server, not connected to the Internet. It has a PPS
generated by a Rubidium source (no time correction only frequency
discipline). A number of client discipline their clock based on it.

The server use the PPS Clock Discipline driver.

The server reports:

status=2544 leap_none, sync_local_proto/PPS, 4 events, event_peer/strat_chg,
version="ntpd 4.2.2 at 1.1532-o Wed Jun 21 13:19:03 UTC 2006 (1)",
processor="i386", system="FreeBSD/5.4-RELEASE", leap=00, stratum=1,
precision=-20, rootdelay=0.000, rootdispersion=10.003, peer=64989,
refid=LOCL, reftime=c843cd26.9bf01e84  Wed, Jun 21 2006 13:50:30.609,
poll=6, clock=c843cd34.2ee3b9a5  Wed, Jun 21 2006 13:50:44.183, state=4,
offset=0.000, frequency=34.296, jitter=0.001, noise=0.001,
stability=0.012, tai=0
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
 PPS(0)          .RBDM.           0 l    -   64    0    0.000    0.000   0.001
*LOCAL(0)        .LOCL.           0 l   14   64  377    0.000    0.000   0.001


How the root dispersion is calculated for a server without any higher
stratum peers? 

Is this value passed to each client and used in the clock filter
calculations?

Thank you,

Mauro




-- 
Mauro Fiacco 

ip.access Ltd                      
URL: www.ipaccess.com  




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