Cabletron Systems 802.11 Requirements, Lightning protection, Grounding system, Line of sight

Site Preparation Guide

Requirements

Lightning protection

A lightning rod must be placed close to the antenna mast or wall bracket. This is required to protect the antenna from direct lightning strikes.

Grounding system

Direct earth grounding of the antenna and the lightning arrestor is necessary to protect the installation from lightning and the build-up of static electricity. The wireless device and the lightning arrestor must be connected to the same ground. The antenna and the mounting structure require a separate earth ground connection.

Check with a certified antenna installer to make sure the antenna is properly grounded.

Line of sight

Spread spectrum systems for LANs are complete point-to-point systems and require a clear line of sight from location to location. Zone widths of the beam depend on the distance between the antennas. The defined radius is an area that is widest at its center. The table below shows the zone radius required at 2.4 GHz.

Figure 1: Clear Line of Sight

No Obstruction Area

Direct RF Path

100_05

Building A Building B

2