Chapter 3: System planning
Site planning
Page
3-11
Note
A restricted access location is defined (in EN 60950-1) as one where access may only be
gained by use of a tool or lock and key, or other means of security, and access is controlled
by the authority responsible for the location. Access must only be gained by persons who
have been instructed about the reasons for the restrictions applied to the location and
about any precautions that must be taken. Examples of permissible restricted access
locations are a lockable equipment room or a lockable cabinet.
ODU wind loading
Ensure that the ODU and the structure on which it is mounted are capable of withstanding the prevalent
wind speeds at a proposed 450 Platform site. Wind speed statistics are available from national
meteorological offices.
The ODU and its mounting bracket are capable of withstanding wind speeds of:
•
Up to 200 mph (322 kph) for PMP 450m Series – AP 5 GHz
•
Up to 124 mph (200 kph) for PMP 450m Series – AP 3 GHz
•
Up to 124 mph (Integrated) for PMP/PTP 450i – all models 3 GHz and 5 GHz
•
Up to 200 mph (Connectorized) for PMP/PTP 450i – all models 3 GHz and 5 GHz
•
Up to 200 mph (322 kph) for PMP/PTP 450 – all models
•
Up to 200 mph (322 kph) for PMP 450 – Ruggedized
•
Up to 200 mph (322 kph) for PMP 450i – all models 900 MHz
•
Up to 118 mph (191 kph) for PMP 450b Mid-Gain
•
Up to 90 mph (145 kph) for PMP 450b High Gain
•
Up to 90 mph (145 kph) for PMP 450d
•
Up to 100 mph (161 kph) for 900 MHz antennas
Wind blowing on the ODU will subject the mounting structure to significant lateral force. The magnitude
of the force depends on both wind strength and surface area of the ODU. Wind loading is estimated
using the following formulae:
•
Force (in kilograms) = 0.1045aV
2
where:
o
“a” is the surface area in square meters, and
o
“V” is the wind speed in meters per second.
•
Force (in pounds) = 0.0042Av
2
where:
o
“A” is the surface area in square feet, and
o
“v” is the wind speed in miles per hour.
Applying these formulae to the 450 platform at different wind speeds, the resulting wind loadings are
shown in below tables.
