Crestron ZUMMESH-JBOX-20A-PLUG handleiding

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Handleiding

Best Practices – DOC. 6689H Installation and Setup of Crestron RF Products • 13

NOTE: A good rule to follow is that if almost the entire signal is below -80 dBm, the

channel is good.

Wi-Fi channels 1, 6, and 11 are highlighted in the “Chanalyzer Capture of Total RF

Interference Sample

” below. The sample shows that Wi-Fi networks are operating on channel 1 and channel 11,

and that the channel 11 network is farther away. By visual inspection of the graph, note that

channel 6 is the most free, followed by channel 11. Wi-Fi channel 1 has some minor signals

above -80 dBm, which may be fine, but may cause reliability issues for any Wi-Fi devices

using that channel or any 802.15.4 devices using channels 11–14.

The sections below provide examples of cordless phone, microwave oven, and i802.11g

network interference.

Cordless Phone Interference

The example below shows 2.4 GHz cordless phone interference. There are very high peaks

of interference at levels of -40 dBm and above. This level of interference affects all three

non-overlapping Wi-Fi channels significantly and causes interference issues with any

equipment installed in the 2.4 GHz range. In this scenario, to provide reliable installation

remove or replace the offending device with a comparable device that operates in a different

band (900 MHz or 5 GHz). Wireless performance in the 2.4 GHz range cannot be

guaranteed with outside devices that create such a large amount of interference.

Chanalyzer Capture of a Poor RF Environment Created by Cordless Phones

Microwave Oven Interference

The example below shows interference emitted from a microwave oven. A microwave oven

does not have the high peaks of interference that the 2.4 GHz cordless phone has;

however, the radiation of a microwave oven affects most channels. Although the radiation

usually does not cause major issues, it can periodically reduce performance and cause

instability.

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