SMC EliteConnect Wireless Bridge Uživatelská příručka stáhnout pdf (Strana 37)

Ethernet Cabling

3-5

Radio Interference

The avoidance of radio interference is an important part of wireless link 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

channel frequencies. Always use a channel frequency that is furthest away from

another signal.

If radio interference is still a problem with your wireless bridge link, changing the

antenna polarization direction may improve the situation. This is only recommended

when the integrated internal antenna is used.

Weather Conditions

When planning wireless bridge links, you must take into account any extreme

weather conditions that are known to affect your location. Consider these factors:

• Temperature — The wireless bridge is tested for normal operation in temperatures

from -40°C to 60°C. Operating in temperatures outside of this range may cause the

unit to fail.

• Wind Velocity — The wireless bridge 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 wireless bridge 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 wireless bridge 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 the Ethernet port and antenna connectors

for extra protection. If moisture enters a connector, it may cause a degradation in

performance or even a complete failure of the link.

• 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 the link to fail.

In this case, the snow or ice has to be cleared from the antennas to restore

operation of the link.

Ethernet Cabling

When a suitable antenna location has been determined, you must plan a cable route

form the wireless bridge outdoors to the power injector module indoors. Consider

these points:

• The Ethernet cable length should never be longer than 100 m (328 ft)

• Determine a building entry point for the cable

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