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Crestron Best Practices RF Products

Devices using the same RF band can interfere with one another’s communication.

As shown in the table on page 2, most of the current Crestron product offerings

transmit using the 2.4 GHz wireless communication band. Even though some

products may not be able to communicate with each other, such as an infiNET

gateway and TPMC-8X (Wi-Fi), they can create interference that degrades

performance or eliminates connectivity.

Most wireless networks use the 2.4 GHz band and consequently most connectivity

issues are concentrated in that band. The 2.4 GHz band is therefore the focus of this

document.

RF Channels

Each RF network type divides the communication band into separate communication

channels. Crestron 2.4 GHz products use two different methods to divide the band:

1. infiNET, infiNET EX, and FocalPoint use 802.15.4 channel mapping,

which provides 16 channels numbered 11-26. Each channel is non-

overlapping, which ensures that a device communicating on one channel

cannot affect devices communicating on any other channels.

NOTE: When 802.15.4 channels are referred to in this document, the

reference relates to infiNET, infiNET EX, and FocalPoint technologies.

NOTE: By default, the Crestron TPS-RFGWX network does not use

specific channels but rather frequency hops over the entire 2.4 GHz band.

A site survey, removal of outside interference, and proper gateway

installation as discussed in this manual improve the performance of the

TPS-RFGWX network.

2. 802.11b and 802.11g use the same Wi-Fi channel map. Eleven channels,

numbered 1-11, can be used in the U.S., and more channels can be used in

other countries. Each channel overlaps two channels on each side; for

example, a device communicating on channel 6 causes interference to any

devices communicating on channels 4, 5, 7, and 8. As a result, in this

example, there are only three available non-overlapping Wi-Fi channels:

1, 6, and 11.

NOTE: 802.11a uses the 5.8 GHz band and has a different RF channel

mapping than that of 802.11b and 802.11g. While 802.11a does not have a

line-of-sight transmission distance as good as that of 802.11g, 802.11a often

has much less interference. In a poor RF environment, 802.11a can provide

a more robust solution than 802.11g.

The following illustration shows the division of the 2.4 GHz band as it relates to

802.15.4 and 802.11 channels.

Reference Guide – DOC. 6689C Best Practices – RF Products • 3

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Crestron CNRFGWX Especificaciones Pagina 7