SMC Networks SMC2890W-AN, Руководство по установке

Страница: 24 / 53

Chapter 3
| AP Chassis
General Installation Guidelines
– 24 –
Ethernet Cabling
From the intended AP location, plan a cable route from the unit outdoors to the
power injector module indoors. Consider these guidelines:
◆
The total Ethernet cable length should never be longer than 100 m (328 ft).
◆
Determine a building entry point for the cable.
◆
Determine if conduits, bracing, or other structures are required for safety or
protection of the cable.
◆
For lightning protection at the power injector end of the cable, consider using a
lightning arrestor immediately before the cable enters the building.
Radio Interference
The avoidance of radio interference is an important part of wireless network
planning. Interference is caused by other radio transmissions using the same or an
adjacent channel frequency. You should first scan your proposed site using a
spectrum analyzer to determine if there are any strong radio signals using the
802.11a/b/g/n channel frequencies. Always use a channel frequency that is furthest
away from another signal.
Weather Conditions
When planning outdoor networks, you must take into account any extreme
weather conditions that are known to affect your location. Consider these factors:
◆
Temperature — The AP is tested for normal operation in temperatures from
-10° C to 60° C. Operating in temperatures outside of this range may cause the
unit to fail.
◆
Wind Velocity — The AP can operate in winds up to 44 m/s and survive higher
wind speeds up to 66 m/s. You must consider the known maximum wind
velocity and direction at the site and be sure that any supporting structure,
such as a pole, mast, or tower, is built to withstand this force.
◆
Lightning — The AP includes its own built-in lightning protection. However,
you should make sure that the unit, any supporting structure, and cables are all
properly grounded. Additional protection using lightning rods, lightning
arrestors, or surge suppressors may also be employed.
◆
Rain — The AP is weatherproofed against rain. Also, prolonged heavy rain has
no significant effect on the radio signal. However, it is recommended to apply
weatherproof sealing tape around all connectors for extra protection.
◆
Snow and Ice — Falling snow, like rain, has no significant effect on the radio
signal. However, a build up of snow or ice on antennas may cause links to fail. In
this case, the snow or ice has to be cleared from the antennas to restore
operation of the unit.