NTPsec

C-ntpsec-1-hour-stats

Report generated: Tue Jun 15 17:01:08 2021 UTC
Start Time: Tue Jun 15 16:00:40 2021 UTC
End Time: Tue Jun 15 17:01:08 2021 UTC
Report published: Tue Jun 15 10:01:13 2021 PDT
Report Period: 0.0 days

Local Clock Time/Frequency Offsets

local offset plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Local Clock Time Offset -941.000 -741.000 -546.000 -114.000 416.000 600.000 681.000 962.000 1,341.000 286.167 -111.084 ns -6.563 16.96
Local Clock Frequency Offset -5.094 -5.094 -5.094 -5.092 -5.088 -5.087 -5.087 0.0058 0.0073 0.0019 -5.092 ppm -1.923e+10 5.151e+13

The time and frequency offsets between the ntpd calculated time and the local system clock. Showing frequency offset (red, in parts per million, scale on right) and the time offset (blue, in μs, scale on left). Quick changes in time offset will lead to larger frequency offsets.

These are fields 3 (time) and 4 (frequency) from the loopstats log file.



Local RMS Time Jitter

local jitter plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Local RMS Time Jitter 116.000 123.000 136.000 194.000 300.000 323.000 359.000 164.000 200.000 47.683 203.633 ns 45.55 191.7

The RMS Jitter of the local clock offset. In other words, how fast the local clock offset is changing.

Lower is better. An ideal system would be a horizontal line at 0μs.

RMS jitter is field 5 in the loopstats log file.



Local RMS Frequency Jitter

local stability plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Local RMS Frequency Jitter 23.000 24.000 28.000 66.000 122.000 128.000 132.000 94.000 104.000 26.852 70.150 10e-12 9.389 27.16

The RMS Frequency Jitter (aka wander) of the local clock's frequency. In other words, how fast the local clock changes frequency.

Lower is better. An ideal clock would be a horizontal line at 0ppm.

RMS Frequency Jitter is field 6 in the loopstats log file.



Local Clock Time Offset Histogram

local offset histogram plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Local Clock Offset -941.000 -741.000 -546.000 -114.000 416.000 600.000 681.000 962.000 1,341.000 286.167 -111.084 ns -6.563 16.96

The clock offsets of the local clock as a histogram.

The Local Clock Offset is field 3 from the loopstats log file.



Local Temperatures

local temps plot

Local temperatures. These will be site-specific depending upon what temperature sensors you collect data from. Temperature changes affect the local clock crystal frequency and stability. The math of how temperature changes frequency is complex, and also depends on crystal aging. So there is no easy way to correct for it in software. This is the single most important component of frequency drift.

The Local Temperatures are from field 3 from the tempstats log file.



Local Frequency/Temp

local freq temps plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Local Clock Frequency Offset -5.094 -5.094 -5.094 -5.092 -5.088 -5.087 -5.087 0.0058 0.0073 0.0019 -5.092 ppm -1.923e+10 5.151e+13
Temp ZONE0 57.458 57.458 57.458 57.996 57.996 58.534 58.534 0.538 1.076 0.193 57.960 °C

The frequency offsets and temperatures. Showing frequency offset (red, in parts per million, scale on right) and the temperatures.

These are field 4 (frequency) from the loopstats log file, and field 3 from the tempstats log file.



Local GPS

local gps plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
nSats 8.000 8.000 9.000 10.000 12.000 12.000 12.000 3.000 4.000 0.885 10.500 nSat 1315 1.464e+04
TDOP 0.650 0.650 0.650 0.970 1.100 1.110 1.110 0.450 0.460 0.135 0.929 217.8 1365

Local GPS. The Time Dilution of Precision (TDOP) is plotted in blue. The number of visible satellites (nSat) is plotted in red.

TDOP is field 3, and nSats is field 4, from the gpsd log file. The gpsd log file is created by the ntploggps program.

TDOP is a dimensionless error factor. Smaller numbers are better. TDOP ranges from 1 (ideal), 2 to 5 (good), to greater than 20 (poor). Some GNSS receivers report TDOP less than one which is theoretically impossible.



Server Offsets

peer offsets plot

The offset of all refclocks and servers. This can be useful to see if offset changes are happening in a single clock or all clocks together.

Clock Offset is field 5 in the peerstats log file.



Server Offset 104.131.155.175

peer offset 104.131.155.175 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Offset 104.131.155.175 2.409 2.409 2.409 2.548 2.548 2.548 2.548 0.139 0.139 0.069 2.479 ms 4.181e+04 1.454e+06

The offset of a server in seconds. This is useful to see how the measured offset is behaving.

The chart also plots offset±rtt, where rtt is the round trip time to the server. NTP can not really know the offset of a remote chimer, NTP computes it by subtracting rtt/2 from the offset. Plotting the offset±rtt reverses this calculation to more easily see the effects of rtt changes.

Closer to 0s is better. An ideal system would be a horizontal line at 0s. Typical 90% ranges may be: local LAN server 80µs; 90% ranges for WAN server may be 4ms and much larger.

Clock Offset is field 5 in the peerstats log file. The Round Trip Time (rtt) is field 6 in the peerstats log file.



Server Offset 162.159.200.123

peer offset 162.159.200.123 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Offset 162.159.200.123 2.514 2.514 2.514 2.715 3.187 3.187 3.187 0.674 0.674 0.202 2.808 ms 2181 2.864e+04

The offset of a server in seconds. This is useful to see how the measured offset is behaving.

The chart also plots offset±rtt, where rtt is the round trip time to the server. NTP can not really know the offset of a remote chimer, NTP computes it by subtracting rtt/2 from the offset. Plotting the offset±rtt reverses this calculation to more easily see the effects of rtt changes.

Closer to 0s is better. An ideal system would be a horizontal line at 0s. Typical 90% ranges may be: local LAN server 80µs; 90% ranges for WAN server may be 4ms and much larger.

Clock Offset is field 5 in the peerstats log file. The Round Trip Time (rtt) is field 6 in the peerstats log file.



Server Offset 173.11.101.155

peer offset 173.11.101.155 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Offset 173.11.101.155 -1.069 -1.069 -1.069 0.145 0.557 0.557 0.557 1.626 1.626 0.463 -0.031 ms -5.241 14.31

The offset of a server in seconds. This is useful to see how the measured offset is behaving.

The chart also plots offset±rtt, where rtt is the round trip time to the server. NTP can not really know the offset of a remote chimer, NTP computes it by subtracting rtt/2 from the offset. Plotting the offset±rtt reverses this calculation to more easily see the effects of rtt changes.

Closer to 0s is better. An ideal system would be a horizontal line at 0s. Typical 90% ranges may be: local LAN server 80µs; 90% ranges for WAN server may be 4ms and much larger.

Clock Offset is field 5 in the peerstats log file. The Round Trip Time (rtt) is field 6 in the peerstats log file.



Server Offset 178.62.68.79

peer offset 178.62.68.79 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Offset 178.62.68.79 502.072 502.072 502.072 626.880 701.146 701.146 701.146 199.074 199.074 82.140 610.033 µs 284.4 1948

The offset of a server in seconds. This is useful to see how the measured offset is behaving.

The chart also plots offset±rtt, where rtt is the round trip time to the server. NTP can not really know the offset of a remote chimer, NTP computes it by subtracting rtt/2 from the offset. Plotting the offset±rtt reverses this calculation to more easily see the effects of rtt changes.

Closer to 0s is better. An ideal system would be a horizontal line at 0s. Typical 90% ranges may be: local LAN server 80µs; 90% ranges for WAN server may be 4ms and much larger.

Clock Offset is field 5 in the peerstats log file. The Round Trip Time (rtt) is field 6 in the peerstats log file.



Server Offset 192.168.1.10

peer offset 192.168.1.10 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Offset 192.168.1.10 102.293 102.293 108.652 167.570 223.309 266.415 266.415 114.657 164.122 38.847 167.612 µs 46.6 192.2

The offset of a server in seconds. This is useful to see how the measured offset is behaving.

The chart also plots offset±rtt, where rtt is the round trip time to the server. NTP can not really know the offset of a remote chimer, NTP computes it by subtracting rtt/2 from the offset. Plotting the offset±rtt reverses this calculation to more easily see the effects of rtt changes.

Closer to 0s is better. An ideal system would be a horizontal line at 0s. Typical 90% ranges may be: local LAN server 80µs; 90% ranges for WAN server may be 4ms and much larger.

Clock Offset is field 5 in the peerstats log file. The Round Trip Time (rtt) is field 6 in the peerstats log file.



Server Offset 194.58.202.211

peer offset 194.58.202.211 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Offset 194.58.202.211 3.627 3.627 3.627 3.761 4.062 4.062 4.062 0.436 0.436 0.144 3.812 ms 1.649e+04 4.212e+05

The offset of a server in seconds. This is useful to see how the measured offset is behaving.

The chart also plots offset±rtt, where rtt is the round trip time to the server. NTP can not really know the offset of a remote chimer, NTP computes it by subtracting rtt/2 from the offset. Plotting the offset±rtt reverses this calculation to more easily see the effects of rtt changes.

Closer to 0s is better. An ideal system would be a horizontal line at 0s. Typical 90% ranges may be: local LAN server 80µs; 90% ranges for WAN server may be 4ms and much larger.

Clock Offset is field 5 in the peerstats log file. The Round Trip Time (rtt) is field 6 in the peerstats log file.



Server Offset 194.58.202.219

peer offset 194.58.202.219 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Offset 194.58.202.219 3.664 3.664 3.664 3.888 4.107 4.107 4.107 0.444 0.444 0.148 3.879 ms 1.601e+04 4.048e+05

The offset of a server in seconds. This is useful to see how the measured offset is behaving.

The chart also plots offset±rtt, where rtt is the round trip time to the server. NTP can not really know the offset of a remote chimer, NTP computes it by subtracting rtt/2 from the offset. Plotting the offset±rtt reverses this calculation to more easily see the effects of rtt changes.

Closer to 0s is better. An ideal system would be a horizontal line at 0s. Typical 90% ranges may be: local LAN server 80µs; 90% ranges for WAN server may be 4ms and much larger.

Clock Offset is field 5 in the peerstats log file. The Round Trip Time (rtt) is field 6 in the peerstats log file.



Server Offset 203.123.48.219

peer offset 203.123.48.219 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Offset 203.123.48.219 -1.379 -1.379 -1.379 5.024 5.155 5.155 5.155 6.533 6.533 1.914 4.303 ms 3.121 6.733

The offset of a server in seconds. This is useful to see how the measured offset is behaving.

The chart also plots offset±rtt, where rtt is the round trip time to the server. NTP can not really know the offset of a remote chimer, NTP computes it by subtracting rtt/2 from the offset. Plotting the offset±rtt reverses this calculation to more easily see the effects of rtt changes.

Closer to 0s is better. An ideal system would be a horizontal line at 0s. Typical 90% ranges may be: local LAN server 80µs; 90% ranges for WAN server may be 4ms and much larger.

Clock Offset is field 5 in the peerstats log file. The Round Trip Time (rtt) is field 6 in the peerstats log file.



Server Offset 204.123.2.5

peer offset 204.123.2.5 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Offset 204.123.2.5 1.987 1.987 1.987 2.252 2.529 2.529 2.529 0.542 0.542 0.170 2.254 ms 1876 2.344e+04

The offset of a server in seconds. This is useful to see how the measured offset is behaving.

The chart also plots offset±rtt, where rtt is the round trip time to the server. NTP can not really know the offset of a remote chimer, NTP computes it by subtracting rtt/2 from the offset. Plotting the offset±rtt reverses this calculation to more easily see the effects of rtt changes.

Closer to 0s is better. An ideal system would be a horizontal line at 0s. Typical 90% ranges may be: local LAN server 80µs; 90% ranges for WAN server may be 4ms and much larger.

Clock Offset is field 5 in the peerstats log file. The Round Trip Time (rtt) is field 6 in the peerstats log file.



Server Offset SHM(0)

peer offset SHM(0) plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Offset SHM(0) -62.729 -62.255 -61.697 -55.754 -48.269 -47.624 -46.915 13.428 14.632 4.237 -56.241 ms -2951 4.272e+04

The offset of a server in seconds. This is useful to see how the measured offset is behaving.

The chart also plots offset±rtt, where rtt is the round trip time to the server. NTP can not really know the offset of a remote chimer, NTP computes it by subtracting rtt/2 from the offset. Plotting the offset±rtt reverses this calculation to more easily see the effects of rtt changes.

Closer to 0s is better. An ideal system would be a horizontal line at 0s. Typical 90% ranges may be: local LAN server 80µs; 90% ranges for WAN server may be 4ms and much larger.

Clock Offset is field 5 in the peerstats log file. The Round Trip Time (rtt) is field 6 in the peerstats log file.



Server Offset SHM(1)

peer offset SHM(1) plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Offset SHM(1) -942.000 -742.000 -547.000 -115.000 417.000 601.000 682.000 964.000 1,343.000 286.842 -111.465 ns -6.564 16.95

The offset of a server in seconds. This is useful to see how the measured offset is behaving.

The chart also plots offset±rtt, where rtt is the round trip time to the server. NTP can not really know the offset of a remote chimer, NTP computes it by subtracting rtt/2 from the offset. Plotting the offset±rtt reverses this calculation to more easily see the effects of rtt changes.

Closer to 0s is better. An ideal system would be a horizontal line at 0s. Typical 90% ranges may be: local LAN server 80µs; 90% ranges for WAN server may be 4ms and much larger.

Clock Offset is field 5 in the peerstats log file. The Round Trip Time (rtt) is field 6 in the peerstats log file.



Server Jitters

peer jitters plot

The RMS Jitter of all refclocks and servers. Jitter is the current estimated dispersion, in other words the variation in offset between samples.

Closer to 0s is better. An ideal system would be a horizontal line at 0s.

RMS Jitter is field 8 in the peerstats log file.



Server Jitter 104.131.155.175

peer jitter 104.131.155.175 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Jitter 104.131.155.175 0.323 0.323 0.323 1.005 1.005 1.005 1.005 0.682 0.682 0.341 0.664 ms 3.691 7.188

The RMS Jitter of a server. Jitter is the current estimated dispersion, in other words the variation in offset between samples.

Closer to 0s is better. An ideal system would be a horizontal line at 0s.

RMS Jitter is field 8 in the peerstats log file.



Server Jitter 162.159.200.123

peer jitter 162.159.200.123 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Jitter 162.159.200.123 0.251 0.251 0.251 0.490 12.594 12.594 12.594 12.343 12.343 4.773 3.773 ms 0.2208 1.512

The RMS Jitter of a server. Jitter is the current estimated dispersion, in other words the variation in offset between samples.

Closer to 0s is better. An ideal system would be a horizontal line at 0s.

RMS Jitter is field 8 in the peerstats log file.



Server Jitter 173.11.101.155

peer jitter 173.11.101.155 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Jitter 173.11.101.155 0.867 0.867 0.867 1.837 4.569 4.569 4.569 3.702 3.702 1.242 2.405 ms 4.301 10.33

The RMS Jitter of a server. Jitter is the current estimated dispersion, in other words the variation in offset between samples.

Closer to 0s is better. An ideal system would be a horizontal line at 0s.

RMS Jitter is field 8 in the peerstats log file.



Server Jitter 178.62.68.79

peer jitter 178.62.68.79 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Jitter 178.62.68.79 0.384 0.384 0.384 10.630 10.636 10.636 10.636 10.251 10.251 4.831 7.217 ms 0.8947 1.626

The RMS Jitter of a server. Jitter is the current estimated dispersion, in other words the variation in offset between samples.

Closer to 0s is better. An ideal system would be a horizontal line at 0s.

RMS Jitter is field 8 in the peerstats log file.



Server Jitter 192.168.1.10

peer jitter 192.168.1.10 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Jitter 192.168.1.10 0.051 0.051 0.089 0.143 6.444 8.751 8.751 6.354 8.700 2.505 1.468 ms 0.3193 2.518

The RMS Jitter of a server. Jitter is the current estimated dispersion, in other words the variation in offset between samples.

Closer to 0s is better. An ideal system would be a horizontal line at 0s.

RMS Jitter is field 8 in the peerstats log file.



Server Jitter 194.58.202.211

peer jitter 194.58.202.211 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Jitter 194.58.202.211 0.173 0.173 0.173 2.025 8.627 8.627 8.627 8.454 8.454 2.782 2.934 ms 0.7991 2.312

The RMS Jitter of a server. Jitter is the current estimated dispersion, in other words the variation in offset between samples.

Closer to 0s is better. An ideal system would be a horizontal line at 0s.

RMS Jitter is field 8 in the peerstats log file.



Server Jitter 194.58.202.219

peer jitter 194.58.202.219 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Jitter 194.58.202.219 0.198 0.198 0.198 1.070 8.208 8.208 8.208 8.010 8.010 2.961 3.526 ms 0.8642 1.793

The RMS Jitter of a server. Jitter is the current estimated dispersion, in other words the variation in offset between samples.

Closer to 0s is better. An ideal system would be a horizontal line at 0s.

RMS Jitter is field 8 in the peerstats log file.



Server Jitter 203.123.48.219

peer jitter 203.123.48.219 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Jitter 203.123.48.219 0.394 0.394 0.394 2.752 13.254 13.254 13.254 12.860 12.860 4.136 3.908 ms 0.8193 2.709

The RMS Jitter of a server. Jitter is the current estimated dispersion, in other words the variation in offset between samples.

Closer to 0s is better. An ideal system would be a horizontal line at 0s.

RMS Jitter is field 8 in the peerstats log file.



Server Jitter 204.123.2.5

peer jitter 204.123.2.5 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Jitter 204.123.2.5 1.056 1.056 1.056 1.566 2.381 2.381 2.381 1.325 1.325 0.439 1.662 ms 30.29 112.6

The RMS Jitter of a server. Jitter is the current estimated dispersion, in other words the variation in offset between samples.

Closer to 0s is better. An ideal system would be a horizontal line at 0s.

RMS Jitter is field 8 in the peerstats log file.



Server Jitter SHM(0)

peer jitter SHM(0) plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Jitter SHM(0) 0.144 0.168 0.256 0.984 3.175 5.680 6.937 2.918 5.512 1.031 1.216 ms 3.051 13.41

The RMS Jitter of a server. Jitter is the current estimated dispersion, in other words the variation in offset between samples.

Closer to 0s is better. An ideal system would be a horizontal line at 0s.

RMS Jitter is field 8 in the peerstats log file.



Server Jitter SHM(1)

peer jitter SHM(1) plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Jitter SHM(1) 69.000 71.000 97.000 222.000 556.000 640.000 683.000 459.000 569.000 133.856 254.982 ns 4.566 13.32

The RMS Jitter of a server. Jitter is the current estimated dispersion, in other words the variation in offset between samples.

Closer to 0s is better. An ideal system would be a horizontal line at 0s.

RMS Jitter is field 8 in the peerstats log file.



Summary


Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Local Clock Frequency Offset -5.094 -5.094 -5.094 -5.092 -5.088 -5.087 -5.087 0.0058 0.0073 0.0019 -5.092 ppm -1.923e+10 5.151e+13
Local Clock Time Offset -941.000 -741.000 -546.000 -114.000 416.000 600.000 681.000 962.000 1,341.000 286.167 -111.084 ns -6.563 16.96
Local RMS Frequency Jitter 23.000 24.000 28.000 66.000 122.000 128.000 132.000 94.000 104.000 26.852 70.150 10e-12 9.389 27.16
Local RMS Time Jitter 116.000 123.000 136.000 194.000 300.000 323.000 359.000 164.000 200.000 47.683 203.633 ns 45.55 191.7
Server Jitter 104.131.155.175 0.323 0.323 0.323 1.005 1.005 1.005 1.005 0.682 0.682 0.341 0.664 ms 3.691 7.188
Server Jitter 162.159.200.123 0.251 0.251 0.251 0.490 12.594 12.594 12.594 12.343 12.343 4.773 3.773 ms 0.2208 1.512
Server Jitter 173.11.101.155 0.867 0.867 0.867 1.837 4.569 4.569 4.569 3.702 3.702 1.242 2.405 ms 4.301 10.33
Server Jitter 178.62.68.79 0.384 0.384 0.384 10.630 10.636 10.636 10.636 10.251 10.251 4.831 7.217 ms 0.8947 1.626
Server Jitter 192.168.1.10 0.051 0.051 0.089 0.143 6.444 8.751 8.751 6.354 8.700 2.505 1.468 ms 0.3193 2.518
Server Jitter 194.58.202.211 0.173 0.173 0.173 2.025 8.627 8.627 8.627 8.454 8.454 2.782 2.934 ms 0.7991 2.312
Server Jitter 194.58.202.219 0.198 0.198 0.198 1.070 8.208 8.208 8.208 8.010 8.010 2.961 3.526 ms 0.8642 1.793
Server Jitter 203.123.48.219 0.394 0.394 0.394 2.752 13.254 13.254 13.254 12.860 12.860 4.136 3.908 ms 0.8193 2.709
Server Jitter 204.123.2.5 1.056 1.056 1.056 1.566 2.381 2.381 2.381 1.325 1.325 0.439 1.662 ms 30.29 112.6
Server Jitter SHM(0) 0.144 0.168 0.256 0.984 3.175 5.680 6.937 2.918 5.512 1.031 1.216 ms 3.051 13.41
Server Jitter SHM(1) 69.000 71.000 97.000 222.000 556.000 640.000 683.000 459.000 569.000 133.856 254.982 ns 4.566 13.32
Server Offset 104.131.155.175 2.409 2.409 2.409 2.548 2.548 2.548 2.548 0.139 0.139 0.069 2.479 ms 4.181e+04 1.454e+06
Server Offset 162.159.200.123 2.514 2.514 2.514 2.715 3.187 3.187 3.187 0.674 0.674 0.202 2.808 ms 2181 2.864e+04
Server Offset 173.11.101.155 -1.069 -1.069 -1.069 0.145 0.557 0.557 0.557 1.626 1.626 0.463 -0.031 ms -5.241 14.31
Server Offset 178.62.68.79 502.072 502.072 502.072 626.880 701.146 701.146 701.146 199.074 199.074 82.140 610.033 µs 284.4 1948
Server Offset 192.168.1.10 102.293 102.293 108.652 167.570 223.309 266.415 266.415 114.657 164.122 38.847 167.612 µs 46.6 192.2
Server Offset 194.58.202.211 3.627 3.627 3.627 3.761 4.062 4.062 4.062 0.436 0.436 0.144 3.812 ms 1.649e+04 4.212e+05
Server Offset 194.58.202.219 3.664 3.664 3.664 3.888 4.107 4.107 4.107 0.444 0.444 0.148 3.879 ms 1.601e+04 4.048e+05
Server Offset 203.123.48.219 -1.379 -1.379 -1.379 5.024 5.155 5.155 5.155 6.533 6.533 1.914 4.303 ms 3.121 6.733
Server Offset 204.123.2.5 1.987 1.987 1.987 2.252 2.529 2.529 2.529 0.542 0.542 0.170 2.254 ms 1876 2.344e+04
Server Offset SHM(0) -62.729 -62.255 -61.697 -55.754 -48.269 -47.624 -46.915 13.428 14.632 4.237 -56.241 ms -2951 4.272e+04
Server Offset SHM(1) -942.000 -742.000 -547.000 -115.000 417.000 601.000 682.000 964.000 1,343.000 286.842 -111.465 ns -6.564 16.95
TDOP 0.650 0.650 0.650 0.970 1.100 1.110 1.110 0.450 0.460 0.135 0.929 217.8 1365
Temp ZONE0 57.458 57.458 57.458 57.996 57.996 58.534 58.534 0.538 1.076 0.193 57.960 °C
nSats 8.000 8.000 9.000 10.000 12.000 12.000 12.000 3.000 4.000 0.885 10.500 nSat 1315 1.464e+04
Summary as CSV file


Glossary:

frequency offset:
The difference between the ntpd calculated frequency and the local system clock frequency (usually in parts per million, ppm)
jitter, dispersion:
The short term change in a value. NTP measures Local Time Jitter, Refclock Jitter, and Server Jitter in seconds. Local Frequency Jitter is in ppm or ppb.
kurtosis, Kurt:
The kurtosis of a random variable X is the fourth standardized moment and is a dimension-less ratio. ntpviz uses the Pearson's moment coefficient of kurtosis. A normal distribution has a kurtosis of three. NIST describes a kurtosis over three as "heavy tailed" and one under three as "light tailed".
ms, millisecond:
One thousandth of a second = 0.001 seconds, 1e-3 seconds
mu, mean:
The arithmetic mean: the sum of all the values divided by the number of values. The formula for mu is: "mu = (∑xi) / N". Where xi denotes the data points and N is the number of data points.
ns, nanosecond:
One billionth of a second, also one thousandth of a microsecond, 0.000000001 seconds and 1e-9 seconds.
percentile:
The value below which a given percentage of values fall.
ppb, parts per billion:
Ratio between two values. These following are all the same: 1 ppb, one in one billion, 1/1,000,000,000, 0.000,000,001, 1e-9 and 0.000,000,1%
ppm, parts per million:
Ratio between two values. These following are all the same: 1 ppm, one in one million, 1/1,000,000, 0.000,001, and 0.000,1%
‰, parts per thousand:
Ratio between two values. These following are all the same: 1 ‰. one in one thousand, 1/1,000, 0.001, and 0.1%
refclock:
Reference clock, a local GPS module or other local source of time.
remote clock:
Any clock reached over the network, LAN or WAN. Also called a peer or server.
time offset:
The difference between the ntpd calculated time and the local system clock's time. Also called phase offset.
σ, sigma:
Sigma denotes the standard deviation (SD) and is centered on the arithmetic mean of the data set. The SD is simply the square root of the variance of the data set. Two sigma is simply twice the standard deviation. Three sigma is three times sigma. Smaller is better.
The formula for sigma is: "σ = √[ ∑(xi-mu)^2 / N ]". Where xi denotes the data points and N is the number of data points.
skewness, Skew:
The skewness of a random variable X is the third standardized moment and is a dimension-less ratio. ntpviz uses the Pearson's moment coefficient of skewness. Wikipedia describes it best: "The qualitative interpretation of the skew is complicated and unintuitive."
A normal distribution has a skewness of zero.
upstream clock:
Any server or reference clock used as a source of time.
µs, us, microsecond:
One millionth of a second, also one thousandth of a millisecond, 0.000,001 seconds, and 1e-6 seconds.



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