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Crestron Best Practices RF Products

Large RF Network Installations

If you are installing a large number of RF networks in a single installation, it may not

be possible to give each network its own channel. In large environments, networks

can be placed on the same channels as long as devices are far enough apart to ensure

that the RF signals do not overlap for similar channels. The following illustration

shows how Wi-Fi 802.11b/g networks can be spaced by channel so that they do not

interfere with each other (as viewed from overhead).

Wi-Fi Channel Allocation Map

By physically separating the networks, the amount of interference among networks

on the same channel is reduced. A standard channel map cannot be created for these

installations because multiple networks reside on each channel. Channels 1, 6, and

11 are usually chosen for Wi-Fi networks because they are the only three non-

overlapping Wi-Fi channels. 802.15.4 channels 15, 20, 25, and 26 do not overlap

with Wi-Fi channels 1, 6, and 11; therefore, channels 15, 20, 25, and 26 can be used

on 802.15.4 networks in conjunction with this scheme. For this scheme to function

well, however, there must be low interference across the entire 2.4 GHz band.

Installing and Configuring RF Gateways

The physical location of the RF gateway in relation to the connected wireless devices

must be considered for successful installation. When installing an RF gateway,

adhere to the following guidelines for optimum performance:

• Place the gateway in a location as follows:

⇒ On the same floor as the wireless devices

NOTE: For Wi-Fi networks, there should be no more than one

wall between the gateway and wireless devices. Both the thickness

and material in the obstruction determines how much signal can

pass.

⇒ Above the height of most furniture

⇒ Away from large metal objects (such as an AV rack and

televisions)

NOTE: Plasma technology also produces RF interference.

Reference Guide – DOC. 6689C Best Practices – RF Products • 13

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