Microsemi SyncServer S200 User Manual page 24

Web Interface
Receiver Description: "GPS" indicates the presence of a 12-channel GPS receiver.
Receiver Status:
Receiver Down: The Hardware Clock can't communicate with the receiver.
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Unknown Mode: An undefined mode of the GPS receiver.
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Acquiring Signal: The receiver is attempting to track a GPS signal.
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Bad Geometry: The geometry of the tracked satellites is unsatisfactory for a position solu-
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tion.
Propagate Mode: A position estimation mode used in highly dynamic environments.
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2d Solution: The receiver is able to perform position fixes for latitude and longitude but
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does not have enough satellites for altitude.
3d Solution: The receiver is now able to perform position fixes for latitude, longitude and
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altitude.
Position Hold: Position fixes are no longer attempted, and the surveyed or user-entered
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position is used.
Time Valid: The receiver has valid timing information from GPS satellites (including GPS-
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UTC Offset and Leap Indicator). If the GPS receiver and antenna are set up correctly, the
receiver status should eventually reach and remain in this state.
Mode:
Survey: The receiver is surveying and averaging its position. When it has finished sur-
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veying, the receiver switches to Position Hold mode. Survey mode and Position Hold
mode are appropriate for static applications, such as a typical server room environment.
This is the default mode when the SyncServer starts.
Dynamic: The GPS receiver surveys continuously to determine its position and doesn't
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switch to another mode. This mode must be initiated by a user, and is appropriate for
mobile applications such as ships, land vehicles, and aircraft. The degree of accuracy this
mode offers is fine for NTP time over networks, but is less than optimal for the timing out-
puts available on some SyncServer models.
Position Hold: The GPS receiver has completed Survey mode and switched to this
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mode, or the user has manually entered a position and "forced" it into this mode. The
accuracy and stability of the SyncServer's timing outputs are optimal when the receiver
has its exact position and is in this mode.
Antenna Cable Delay (nS):
The user-configured value (on the REFERENCES - GPS page) to compensate for GPS signal
propagation from the antenna along the length of the cable to the receiver.
Antenna Status:
The GPS receiver supplies power to the GPS antenna through the antenna cable. It also
monitors the current to that circuit to detect open or short circuits.
Good: The current to the GPS antenna and cable is normal.
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Open: The current is too low. The GPS antenna or cable is probably disconnected or
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broken. Some splitters may cause this condition as well.
Short: The current is too high. The GPS antenna or cable probably has a short circuit.
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