Ubee DDW366 User Manual page 87

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9.7.1 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 76 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.
9.7.2 Estimating Wireless Cable Modem to Wireless Client Distances
The information in this section helps you to determine how far a wireless access point (the
DDW366) 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 DDW366 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 DDW366. Refer to
on page 13
2. Place the wireless client at around one meter (three feet) away from the DDW366.
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.
Ubee DDW366 Dual-Band Concurrent Advanced Wireless Gateway Subscriber User Guide • February 2014
if needed.
76. This value is used in the formula further below.
Attenuation Considerations
Material
Free Space
Interior Drywall
Cubicle Wall
Wood Door (Hollow/Solid)
Brick, Concrete Wall (Note 1)
Glass Window (not tinted)
Deploying and Troubleshooting the Wireless Network
Using the Access Control Option on
Connecting Devices to the Network
Using the Access Control
Attenuation
2.4GHZ 5GHz
0.24dB / foot 0.3dB / foot
3dB to 4dB 3dB to 5dB
2dB to 5dB 4dB to 9dB
3dB to 4dB 6dB to 7dB
6dB to 18dB 10dB to 30dB
2dB to 3dB 6dB to 8dB
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