Interesting stratum 1 NTP clock

Tony Li tli at juniper.net
Thu Jun 25 20:54:19 UTC 1998


> > Also, beware that currently GPS time is 12 seconds fast from UTC.
> 
> The UTC correction is sent in the almanac, I think, as well as the
> leap second warning.  Most boxes make the correction for you, or
> give you the choice.


And GPS time sources do seem to chime in sync with non-GPS sources:

      address         ref clock     st  when  poll reach  delay  offset    disp
*~x.x.x.x          .GPS .            1   174   256  377     9.8   -0.21     4.2
+~x.x.x.x          .GPS .            1   237   256  377    15.9    0.17     0.4
 ~x.x.x.x          .    .            1   981  1024  377     8.9  157.65   136.0
+~x.x.x.x          .ACTS.            1     3   256  377    42.8   -0.31     4.2
-~x.x.x.x          .WWVB.            1   334  1024  377    10.0   -7.86     0.2
 ~x.x.x.x          .    .            1   271  1024  373   297.4   66.60    70.4
-~x.x.x.x          .WWVB.            1   680  1024  377    18.0  -10.39     2.0
-~x.x.x.x          .    .            1   219  1024  277   195.8   20.83    40.5
-~y.y.y.y          .GPS .            1    21   256  377    24.6    0.73     0.6
+~x.x.x.x          .USNO.            1   209   256  377    41.6    0.16     0.2
-~x.x.x.x          .USNO.            1   592  1024  377    61.7   17.96    97.0

Or, from another perspective:

      address         ref clock     st  when  poll reach  delay  offset    disp
-~x.x.x.x          .GPS .            1   686  1024  377    54.9  -10.35     5.2
+~x.x.x.x          .USNO.            1   128   128  376   107.0    0.12     0.3
+~x.x.x.x          .USNO.            1   113   128  377   107.6   -0.32     2.3
-~x.x.x.x          .DCFp.            1    53   512  357    55.6    4.16    10.6
 ~x.x.x.x          .ACTS.            1   279  1024  377   159.1   -2.54    16.1
-~x.x.x.x          .ACTS.            1   347  1024  377   151.7   -2.00     5.9
-~x.x.x.x          .GPS .            1   505  1024  377    70.5    6.75    11.2
 ~x.x.x.x          .GPS .            1   237  1024  377   555.6    7.68    19.5
 ~x.x.x.x          .WWVB.            1   365  1024  377   162.7  -10.05    18.3
+~y.y.y.y          .GPS .            1   183   128  377   164.5    0.83     0.1
+~x.x.x.x          .IRIG.            1    14   128  377   114.5    0.44     1.3
 ~x.x.x.x          .TDF .            1   104  1024  377   116.0   30.94    22.2
+~x.x.x.x          .DCFa.            1   124   128  377    35.7   -0.12     0.8
*~x.x.x.x          .PL02.            1    78   128  377     2.2    0.42     0.4
 ~x.x.x.x          .PL01.            2   180   512  377     1.8    0.05     1.7

Note that the y.y.y.y address is the beta test box in question.

Addresses changed to protect the guilty.  ;-)

Tony



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