Ubee Interactive Deploying and Troubleshooting the Wireless Network
Ubee DDW36C Advanced Wireless Gateway MSO Operations Guide • October 2015 89
6. 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 DDW36C 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
7. Once you know the optimal feet distance between individual wireless clients and the
DDW36C, you may resolve and prevent some performance issues.
8. Check the wireless signal strength and speed of the computer connected wirelessly to
the DDW36C. 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 12.
Human Body 3dB 6dB
Trees (Note 2) 0.15dB / foot 0.3dB / 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 5GHz
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