Motorola DIMETRA MTS 2, Installation, Configuration And Basic Service Manual

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MTS 2 and MTS 4 Installation, Con
fi
guration and Basic Service Manual GPS Receiver Detailed Troubleshooting
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If status sri -gps returns no data or most
fi
elds are set to ’unknown’, the internal GPS chip is most likely
not operational and requires a reset. Reset the GPS chip by using the command reset gps .
Check GPS status by using the command status sri -t as shown below.
SC: status sri -t
GPS Receiver ID
==============
SOFTWARE VER # 225 SOFTWARE REV # Unknown SOFTWARE DATE Unknown
MODEL # MG4100 SERIAL # Unknown
OPTION LIST Unknown MANUFACTURE DATE 1H2Unknown
GPS Receiver Status:
=================
Model: MG4100 - Self test results not supported.
RTC Comm & Time: N/A Temperature Sensor: N/A
RAM Test: N/A ROM Test: N/A
1 kHZ Presence: N/A
Antenna Status : CONNECTED
Almanac Data : VALID
Location Data : VALID
•
If the Antenna status
fi
eld displays open or short circuit, check the integrity
of the antenna cabling or replace the antenna.
•
PDOP : Positional Dilution of Precision – it is a measure of geometrical strength of
GPS satellite con
fi
guration. If lower value – accuracy is better.
GPS antenna must be connected before the site is powered up for
this status to be returned correctly.
•
If the site is being powered up in a new location for the
fi
rst time, the Almanac Data and
the Location data
fi
elds should display a status of Invalid. Use the site_location -reset and
invalidate gps nvram commands to ensure that the Almanac and Location data are cleared.
The Site Controller must then be reset for these commands to take effect.
•
Check Antenna, cabling and surge arrestors.
6802800U74-N September 2009
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