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 Connections
Figure 4-43 Holes in Top Lid for Rx Cables
GPS Connections
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The MTS Site Controller has an integrated GPS module and an option for a remote GPS module. The
selection is done by con
fi
guring MTS using the BTS Service Software (TESS).
The main purpose of the GPS module is to allow accurate absolute timing of less than ½ of a symbol
between adjacent base stations and to supply UTC (Universal Time Coordinate). Dimetra does not need the
functionality of measuring the cable delay at start-up. The Site Controller calculates the delay, no manual
calculation, or con
fi
guration is required, and supports connection to a remote GPS antenna that is 600 m away
or less. The cable delay if any will be con
fi
gured by BTS Service Software (TESS). Default will be 0 ns.
The antenna/receiver must have a suf
fi
ciently clear view of the sky (10º above the horizon in all directions
without any obstructions) to be able to locate and track at least four satellites during initial power-up. The four
satellites (approx. 20183 km above earth) are used to establish a three dimensional
fi
x (latitude, longitude, and
altitude) for the site. This process can take up to 30 minutes, but typically is completed in less than 5 minutes.
Once the position of the site has been established, the corresponding data is stored
in memory and normal operation resumes.
6802800U74-N September 2009
4-43