Ubee DVW3201B Subscriber User Manual page 72

Deploying and Troubleshooting the Wireless Network
Understanding Received Signal Strength
Received signal strength (RSSI) is measured from connected wireless client devices to
the wireless cable modem. This value can significantly impact wireless
speeds/performance. It is determined by:
 Materials (for example, open air, concrete, trees)
 Distance between wireless clients and the wireless cable modem
 Wireless capabilities of the client devices
To determine the received signal strength, refer to
page 65 and review the RSSI value. A receive signal strength indicator between 0 to -64
dBm is considered optimal. Levels of -67dBm and lower (for example, -70, -80, etc.) have
a downward impact on wireless data throughput.
Estimating Wireless Cable Modem to Wireless Client Distances
The information in this section helps you to determine how far a wireless cable modem
can be placed from wireless client devices. Environmental variances include the
capabilities of wireless clients and the types of material through which the wireless signal
must pass. When the wireless cable modem and wireless clients reach the distance
threshold between each other, network performance degrades.
Steps
To determine wireless cable modem placement:
1. Connect a wireless client to the wireless cable modem. Refer to
the Network on page 12
2. Place the wireless client at around one meter (three feet) away from the wireless cable
modem.
3. Obtain the RSSI value for the connected client. Refer to
Option on page
4. Use the following table to determine what materials the wireless signal must travel
through to reach the desired wireless coverage distance.
Connector/Cable
Free Space
Interior Drywall
Cubicle Wall
Wood Door (Hollow/Solid)
Brick, Concrete Wall (Note 1)
68
if needed.
65. This value is used in the formula further below.
Attenuation Considerations at 2.4GHz
Material
Ubee DVW3201B Advanced Wireless Voice Gateway Subscriber User Guide • July 2012
Using the Access Control Option on
Connecting Devices to
Using the Access Control
Attenuation
3.5dB
.24dB / foot
3dB to 4dB
2dB to 5dB
3dB to 4dB
6dB to 18db
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