GPS Start Up
Chapter 4: Hardware Installation
GPS Start Up
The times given below are from applying power to the system until GPS LED is solid green illuminating.
GPS startup is the signi
fi
cant contributing factor in determining system start up times.
Initial Start
This is the
fi
rst time an MTS is powered on or after the almanac or position information
has been erased from non volatile memory (NVM). The site needs to locate 4 satellites and
then train the reference oscillator from an unknown state.
Warm Start
The MTS has been previously powered up and the non volatile memory contains valid almanac and
position information and the reference oscillator was trained prior to starting the site. The times
quoted are for a power-off restart. A software restart will be slightly faster.
Soft Restart
This is an MTS restart, where power is maintained during the reset, for example, the remote MTS
restart after software upgrade. The GPS receiver will continue to track satellites during the MTS
restart, thus eliminating the ‘search for satellites’ phase of start-up.
Table 4-2
GPS Start-up Time
Initial Start
Normal Start
Soft restart
Typical
Maximum
Typical
Maximum
Typical
Maximum
10 Minutes
30 Minutes
4 Minutes
10 Minutes
90 Seconds
8 Minutes
If these start-up times are exceeded, then follow the procedures for GPS Site
Controller fault indications section.
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Содержание DIMETRA MTS 2
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