Web Interface
If none of the provided charts meets the needs of your data set, please use the Save AS...
function provided on the TIMING, Time Interval page to export your data to the tool of your
choice for further analysis.
REFERENCES - GPS
GPSPositionandOperatingMode
Note: The SyncServer S350i does not include a GPS receiver.
This page can be used to view or set the GPS receiver's Position and Mode, as well as the
GPS Antenna Cable Delay. Note that the SyncServer model 350i does not have a GPS
receiver.
Status: Indicates whether the GPS receiver is a valid reference (locked) or not (unlocked).
Current Position: The GPS antenna position in Latitude and Longitude by degrees, minutes,
and seconds, and the cardinal points of the compass followed by the altitude in Meters.
These values can be permanently set when the GPS Mode is set to Position Hold.
Mode:
n
Survey: In this mode, the receiver surveys and averages its position before switching to
Position Hold mode. Use this setting for stationary applications, such as server rooms.
This is the default setting.
n
Dynamic: In this mode, the receiver continuously updates its position. Use this setting if
the position of the SyncServer could change occasionally or continuously, such as
vehicles, aircraft, and ships. This setting provides lower timing precision and accuracy
than the Survey and Position Hold modes.
n
Position Hold: In this mode, the receiver calculates the time based on a fixed position that
has been provided by Survey Mode or entered by the user. Use this setting if GPS vis-
ibility is poor and the receiver has difficulty establishing its position using Survey mode
after one day. The accuracy of the user-entered position affects the accuracy of the tim-
ing solution from the GPS reference. Also see Operating in "Window Mode" (on page
143).
Antenna Cable Delay:
Use this setting to achieve the highest timing precision and accuracy on the timing outputs
such as IRIG Out or 1PPS Out. This setting has a negligible effect on NTP synchronization
because the scale of the adjustment (nanoseconds) is not significant compared to mil-
lisecond latencies on typical networks.
The Antenna Cable Delay advances the Hardware Clock slightly to cancel out the signal
delay caused by the length of the GPS antenna cable.
To calculate the adjustment, select the signal propagation rate for the appropriate cable type
from the table below and multiply it by the length of the cable.
Type Rate per foot Rate per meter
RG-58 1.4 nS/foot 4.59 nS/meter
RG-59 1.24 nS/foot 4.06 nS/meter
Page 70..........................................................................997-01520-02 Rev. F1
To Next Page
Loading...
