User's Manual Part 1

Remote GPS Head and Cabling – continued
DRAFT
1X SC480 BTS Hardware Installation, Optimization/ATP, and FRU
Jun 2004
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S Place the RGPS head at least 15 m away from lightning rods, towers,
or structures that attract lightning. RGPS head damage is usually not
the result of a direct lightning strike, but of a lightning strike on a
nearby structure. Also, since a lightning rod is connected to an earth
ground, it can act as a shield and create a shadow that may block or
reduce the signal from a satellite.
S After the BTS is powered up, check the RGPS signal strengths with
the “gstatus” command on the CSA MMI port.
– An optimal installation will have at least one satellite (SV) with an
RSSI value ≥ 50, and at least four (4) satellites with RSSI values
≥ 45.
– A minimal installation should have at least four (4) satellites with
RSSI values ≥ 40.
S The RGPS head is rated for ambient air temperatures from –40°C
(–40°F) to 80°C (176°F), and has ratings for humidity, shock,
waterproof, UV light resistance, vibrations, salt fog, ESD, EMI, and
altitude.
S The RGPS system used for the SCt480 BTS will support up to 604
m (2000 ft.) of overall cable length from the RGPS head to the last
connected BTS. If a long cable run needs to be broken into pieces,
minimize the number of breaks in the cable.
S A Compact BTS equipped with an SDCX is capable of providing up
to three other BTSs with timing signals.
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