Users Manual Part 2

Site Reference 1 PPS Input Status = OK or NOT OK: This indicates whether a valid signal is
being received by the site reference system.
• GPS Operating OK
GPS Operating OK = YES or NO: This indicates whether the GPS receiver is tracking sufficient
satellites to provide a timing reference input to the site reference. This parameter should be YES for
ASC operation. Detailed information on the GPS receiver may be obtained from the status sri -t and
status sri -gps commands. See the following section for details.
• GPS State
GPS State = NOT TRACKING: The GPS receiver is not tracking any satellites. This condition may
persist for some minutes after start-up. Detailed information on the GPS receiver may be obtained
from the status sri -t and status sri -gps commands. See the following section for details.
GPS State = POSITION HOLD/GPS 3D FIX: This is the normal operating state of the external/
internal GPS receiver.
GPS State = SITE SURVEY: The GPS receiver will operate in this state for several hours after an
MTS is started in a new location for the first time. The GPS receiver is attempting to determine
accurate coordinates to enable operation in position hold.
• GPS Satellites Tracked
GPS Satellites Tracked = 0.. 12>: This is the number of satellites tracked that are available for
timing.
NOTICE: If the status sri MMI command indicates that there are no satellites tracked,
then there may be a possible hardware fault. See GPS Receiver Detailed Troubleshooting
on page 384 for further details.
• Sync Free Run Available
Sync Free Run Available (Minutes): This is the number of minutes that the MTS operates without
any degradation of service if the GPS receiver stops working and the site reference is configured for
ASC operation. If the site reference is already in the free run state, the time shown is the balance of
free run time before the MTS stops operating or switches to a lower level of service.
Unsync Free Run Available (Days Hours Mins): This shows the amount of time the sites second-
level fallback (Unsynchronized free run) is capable of operating for. If the site reference is already in
Unsynchronized free run the time shown will be the amount of time the MTS is capable of operating
for before calibration is required.
• Last Calibration Date Time
Last Calibration Date Time
: The site reference is periodically calibrated whenever an adequate
GPS signal is available. The MTS is capable of providing service for up to 12 months without GPS
after each calibration. This parameter shows the date and time of the last calibration snapshot.
• Calibration Due Date Time
Calibration Due Date Time: This shows the date when the MTS requires calibration if the GPS
receiver was to fail at this time.
• GPS Time
• UTC Time
• Local Time
• UTC Time Mode
UTC Time Mode = Not Precise or Precise: When the timing for the site reference is being derived
from the GPS receiver the UTC mode is precise.
• Synchronised
6802800U74-AP
Chapter 13: MTS Troubleshooting
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