Ubee DVW3201B Subscriber User Manual page 73

Ubee Interactive
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.
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
wireless cable modem, you may resolve and prevent some performance issues.
7. To check the wireless signal strength and speed, use the following steps for a
Windows computer connected wirelessly to the wireless cable modem. If the wireless
computer is not connected, refer to
a. Double-click the Wireless networking icon in the system tray.
Ubee DVW3201B Advanced Wireless Voice Gateway Subscriber User Guide • July 2012
Attenuation Considerations at 2.4GHz
Material
(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 Cable Modem 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
2dB to 3dB
13dB
10dB
13dB to 19dB
3dB
.15dB / foot
Note 2: The attenuation caused by trees
varies significantly depending upon the shape
and thickness of the foliage.
Connecting a Wireless Device on page
Attenuation
13.
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