Motorola PTP 500 User's Guide Page 100

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Link planning Chapter 2 Planning considerations
phn-1115_006v000
2-12
Sep 2010
Parameter Meaning
AMOD Threshold The combined receive input signal level on both horizontal
and vertical inputs that results in the link consistently
entering the receive modulation mode under consideration as
the signal level is increased.
System Threshold Thresholds for all modes except BPSK are for the relevant
link optimization AMOD thresholds. System threshold for
BPSK is the RPSK receive sensitivity.
Max Link Loss The maximum link loss for each modulation mode is derived
from the AMOD threshold for that mode (sensitivity threshold
for BPSK) and the maximum region 1 center channel output
power. The figures assume integral antennas are used, with
gain 23 dBi (5.8 GHz and 5.4 GHz).
When to install connectorized units
The majority of radio links can be successfully deployed with the integrated PTP 300
or PTP 500 Series. However the integrated units may not be sufficient in some areas,
for example:
Where the path is heavily obscured by dense woodland on an NLOS link.
Where long LOS links (>80 km or >50 miles) extend over water.
Where there are known to be high levels of interference.
NOTE
PTP LINKPlanner can be used to identify these areas of marginal
performance.
In these areas, connectorized ODUs and external antennas should be used.
The external antennas can be either dual-polarization (as the integrated antenna) or
two single polarized antennas can be used in a spatially diverse configuration. It is
expected that the dual-polarization antennas would normally be used to simplify the
installation process; spatially diverse antennas may provide additional fade margin on
very long LOS links where there is evidence of correlation of the fading characteristics
on Vertical and Horizontal polarizations.
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