Motorola PTP 500 User's Guide Page 98

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Link planning Chapter 2 Planning considerations
phn-1115_006v000
2-10
Sep 2010
PTP LINKPlanner for synchronized networks (PTP 500 only)
TDD synchronization should be planned using PTP LINKPlanner. This will provide the
necessary TDD Frame parameter values which are required to complete a
synchronized installation. Please refer to the
PTP LINKPlanner User Guide
.
Using Line Of Sight Mode (PTP 300 only)
To permit higher data throughput rates over links of range 10 km (6.2 miles) or less,
the PTP 300 Series Bridge can be configured to operate with Line Of Site mode
enabled.
The line of sight capability must be enabled in the license key. This requires purchase
of an upgrade access key.
Line Of Site mode may be used only when the path is completely unobstructed and the
link range is less than 10 km (6 miles). An unobstructed path is one in which the first
Fresnel zone is clear of obstructions and there is zero excess path loss. The PTP
LINKPlanner provides capabilities to check for obstructions in the path.
CAUTION
The link may suffer severely reduced data rate and availability if the LOS
mode is enabled in a link with an obstructed path.
The Line Of Sight mode control is in the Installation Wizard. If the user selects LOS
mode and the link range clearly exceeds 10 km (6.2 miles), the unit automatically
disables LOS mode and data rates, and raises a "Line Of Sight Mode Inactive" front
panel alarm and email alert.
Path loss considerations
Path loss is the amount of attenuation the radio signal undergoes between the two
ends of the link.
Calculating path loss
The path loss is the sum of the attenuation of the path if there were no obstacles in the
way (Free Space Path Loss), the attenuation caused by obstacles (Excess Path Loss)
and a margin to allow for possible fading of the radio signal (Fade Margin). The
calculation of Equation 2-1 need
s t
o be performed to judge whether a particular link
can be installed.
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