Ubee DDW366 User Manual page 88

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5. Use the attenuation value from the materials table above in the following formula:
Formula:
Example:
6. Once you know the optimal feet distance between individual wireless clients and the
DDW366, you may resolve and prevent some performance issues.
7. Check the wireless signal strength and speed of the computer connected wirelessly to
the DDW366. Instructions for checking speeds are provided for both a Windows and
Mac computer in the table below. If the wireless computer is not connected, refer to
Connecting a Wireless Device on page
Ubee DDW366 Dual-Band Concurrent Advanced Wireless Gateway Subscriber User Guide • February 2014
Material
Double Pane Coated Glass
Bullet Proof Glass
Steel / Fire Exit Door
Human Body
Trees (Note 2)
Note 1: Different types of concrete
materials are used in different
parts of the world and the
thickness and coating differ
depending on whether it is used in
floors, interior walls, or exterior
walls.
(Transmit Power, use -30dBm) – (Receiver Sensitivity, use RSSI value) =
Allowable Free Space Loss
Allowable Free Space Loss ÷ Materials Attenuation Value =
Optimal Distance in Feet Between the DDW366 and a Wireless Client
(-30dBm) - (-67dBm) = 37dBm (allowable free space loss for a 54Mbps connection)
37dBm ÷.24db/foot (for open space) = 154.16 feet
Deploying and Troubleshooting the Wireless Network
Attenuation Considerations
2.4GHZ
13dB
10dB
13dB to 19dB
3dB
0.15dB / foot
Note 2: The attenuation caused
by trees varies significantly
depending upon the shape and
thickness of the foliage.
13.
Attenuation
5GHz
20dB
20dB
25dB to 32dB
6dB
0.3dB / foot
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