Ubee DDW365 User Manual page 87

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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
DDW365, you may resolve and prevent some performance issues.
7. Check the wireless signal strength and speed of the computer connected wirelessly to
the DDW365. Instructions for checking speeds are provided for both a Windows and a
Mac computer in the table below. If the wireless computer is not connected, refer to
Connecting a Wireless Device on page
Ubee DDW365 Advanced Wireless Gateway Subscriber User Guide • February 2014
Glass Window (not tinted)
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.
Note 2: The attenuation caused by trees varies significantly depending
upon the shape and thickness of the foliage.
(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 DDW365 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
Material
13.
Attenuation
(2.4GHz)
2dB to 3dB
13dB
10dB
13dB to 19dB
3dB
0.15dB / foot
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