Crestron ZUMMESH-JBOX-20A-PLUG handleiding

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

Site Survey Tasks

NOTE: Wi-Spy 2.4x is used as the site survey tool for the examples in this section. A site

survey on the 2.4 GHz band is demonstrated because it contains the majority of products

communicating over RF. If a tool supports 5 GHz, it can perform the same site survey tasks

as those performed on the 2.4 GHz band.

To perform a site survey, follow the steps below:

1. Shut down all Crestron RF devices to prevent them from being detected and

interpreted as outside interference.

2. Place the detecting equipment in a location where the wireless equipment is used.

3. Take a reading for at least 5 minutes to capture enough data. During the reading,

turn on all electrical equipment in the vicinity, including TVs, computers, Bluetooth

devices, and any microwave ovens (make sure to put something in the microwave

oven first).

If there are cordless phones present, call the lines and pick up the phones to

activate them. Most cordless interference is seen on the 1.9 GHz band and is

created when the phones ring and the lines are active; there may also be

interference in the 2.4 GHz band.

NOTE: As long as Bluetooth does not consist of the majority of RF devices in the

system, any Bluetooth device kept beyond a meter from any access point does not

pose much interference in the 802.15.4 network.

4. If the wireless equipment is to be used in a room greater than 1,000 square feet,

repeat steps 2 and 3 in various locations within the room.

5. If the wireless equipment is to be used in multiple rooms, repeat steps

1 through 4 in each room.

When the reading is complete, Chanalyzer shows the results in a clean and an

easy-to-read view of the signal over the entire 2.4 GHz band, as shown below.

Chanalyzer Capture of Total RF Interference Sample

In the Chanalyzer Capture of Total RF Interference Sample above, the range of wireless

signals is roughly -110 dBm up to -30 dBm (-20 dBm indicates a very strong signal).

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