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PTP 250 User Guide
Maximum cable lengths
The maximum permitted lengths of interface cables in PTP 250 installations are
specified in
Table 2-1 Maximum cable lengths
Interface type
Ethernet power
and data
Wind loading
Ensure that the supporting structure will not be prone to excessive wind loading.
Antennas and equipment mounted on towers or buildings will subject the mounting
structure to significant lateral forces when there is appreciable wind. Antennas are
normally specified by the amount of force (in pounds) for specific wind strengths. The
magnitude of the force depends on both the wind strength and size of the antenna.
The ODU, with or without the integral antenna, is essentially a flat structure. The
magnitude of the lateral force can be estimated from surface area and wind speed.
Calculation of lateral force (metric)
The magnitude of the lateral force can be estimated from:
Force (in kilograms) = 0.1045aV
phn-2182_002v000
May 2011
Table
2-1.
Interface
ODU to network terminating
equipment.
Where:
a
V
Maximum
length
100 m (330 ft)
2
Is:
surface area in square meters
wind speed in meters per second
Site planning
2-5
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