Ubee DDW365

Ubee Interactive Deploying and Troubleshooting the Wireless Network
Ubee DDW365 Advanced Wireless Gateway Subscriber User Guide • February 2014 83
5. Use the attenuation value from the materials table above in the following formula:
Formula:
(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
Example:
(-30dBm) - (-67dBm) = 37dBm (allowable free space loss for a 54Mbps connection)
37dBm ÷.24db/foot (for open space) = 154.16 feet
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 13.
Glass Window (not tinted) 2dB to 3dB
Double Pane Coated Glass 13dB
Bullet Proof Glass 10dB
Steel / Fire Exit Door 13dB to 19dB
Human Body 3dB
Trees (Note 2) 0.15dB / foot
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.
Attenuation Considerations
Material
Attenuation
(2.4GHz)