Ubee Interactive Deploying and Troubleshooting the Wireless Network
Ubee DDW365 Advanced Wireless Gateway Subscriber User Guide • February 2014 82
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 Using the Access Control Option on
page 75 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
DDW365) 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 DDW365 and wireless clients reach the distance threshold
between each other, network performance degrades.
To determine wireless cable modem placement:
1. Connect a wireless client to the DDW365. Refer to Connecting Devices to the Network
on page 13 if needed.
2. Place the wireless client at around one meter (three feet) away from the DDW365.
3. Obtain the RSSI value for the connected client. Refer to Using the Access Control
Option on page 75. This value is used in the formula further below.
4. Use the following table to determine what materials the wireless signal must travel
through to reach the desired wireless coverage distance.
Attenuation Considerations
Material
Attenuation
(2.4GHz)
Free Space 0.24dB / foot
Interior Drywall 3dB to 4dB
Cubicle Wall 2dB to 5dB
Wood Door (Hollow/Solid) 3dB to 4dB
Brick, Concrete Wall (Note 1) 6dB to 18dB
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