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Ubee Interactive
Deploying and Troubleshooting the Wireless Network
Ubee DDW366 Dual-Band Concurrent Advanced Wireless Gateway Subscriber User Guide
•
September 2014
82
Caution
Avoid bridge loops when you enable bridging devices. Bridge loops cause broadcast traffic to
circle the network endlessly. This can degrade throughput and disrupt communications.
Steps
To configure the modem as a bridge:
1.
Click
Wireless
from the main menu.
2. Click
Bridging
from the left side menu. Field descriptions are listed below the screen
example.
9.7
Deploying and Troubleshooting the Wireless Network
Use the information in this section to help you understand, deploy, and troubleshoot your
wireless environments:
Understanding Received Signal Strength on page 83
Estimating Wireless Cable Modem to Wireless Client Distances on page 83
Understanding the 2.4GHz and 5GHZ Bands on page 85
Selecting a Wireless Channel on page 86
Label
Description
Wireless Bridging
Enables or disables bridging.
Remote Bridges
Defines the MAC addresses of other wireless access points that
you want to establish a bridge to and from. These access points
must also have bridging enabled.
Apply
Saves all changes.
Page 87 / 108
Ubee Interactive
Deploying and Troubleshooting the Wireless Network
Ubee DDW366 Dual-Band Concurrent Advanced Wireless Gateway Subscriber User Guide
•
September 2014
83
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 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
Connecting Devices to the Network
on page 13
if needed.
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
Using the Access Control
Option on page 76
. 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
5GHz
Free Space
0.24dB / foot
0.3dB / foot
Interior Drywall
3dB to 4dB
3dB to 5dB
Cubicle Wall
2dB to 5dB
4dB to 9dB
Wood Door (Hollow/Solid)
3dB to 4dB
6dB to 7dB
Brick, Concrete Wall (Note 1)
6dB to 18dB
10dB to 30dB
Glass Window (not tinted)
2dB to 3dB
6dB to 8dB
Page 88 / 108
Ubee Interactive
Deploying and Troubleshooting the Wireless Network
Ubee DDW366 Dual-Band Concurrent Advanced Wireless Gateway Subscriber User Guide
•
September 2014
84
5.
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 DDW366 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
6.
Once you know the optimal feet distance between individual wireless clients and the
DDW366, you may resolve and prevent some performance issues.
7.
Check the wireless signal strength and speed of the computer connected wirelessly to
the DDW366. 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 13
.
Double Pane Coated Glass
13dB
20dB
Bullet Proof Glass
10dB
20dB
Steel / Fire Exit Door
13dB to 19dB
25dB to 32dB
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
Page 89 / 108
Ubee Interactive
Deploying and Troubleshooting the Wireless Network
Ubee DDW366 Dual-Band Concurrent Advanced Wireless Gateway Subscriber User Guide
•
September 2014
85
9.7.3
Understanding the 2.4GHz and 5GHZ Bands
The DDW366 operates in both the 2.4GHZ and 5GHZ frequency bands simultaneously.
This feature allows you to choose the best band for your device to ensure stability with
your local and Internet connection.
The table below provides a comparison between the 2.4GHz and 5GHz bands.
Checking Wireless Signal Strength and Speed
Windows PC
Apple Mac
1.
Click the Wireless networking icon in the
system tray to display a list of available
wireless networks.
1.
Hold down the Option key and click on
the wireless icon (Airport) on the right
side of the top menu bar.
2. Click “Open Network and Sharing Center,”
then click “Wireless Network Connection.”
2. Information about the current wireless
connection appears below the SSID. If
you continue to hold the Option key and
hover over any network, information
about the connection is visible.
3. Review the speed and signal strength in
the Status window.
Page 90 / 108
Ubee Interactive
Deploying and Troubleshooting the Wireless Network
Ubee DDW366 Dual-Band Concurrent Advanced Wireless Gateway Subscriber User Guide
•
September 2014
86
9.7.4
Selecting a Wireless Channel
You may need to change the wireless channel on which the DDW366 operates when you
are in computing, test, and other environments where several wireless access points may
be operating in the 2.4GHz range.
In some cases, you may want to segment your wireless traffic where a group of devices
operates on one channel and another group operates on another channel, and so on. This
is done by configuring the channel on each wireless access point individually (if you have
multiples). If you have control over only one wireless device in an environment where
there may be several, you can change the wireless channel on your device to one that is
not heavily used.
Note
To change the wireless broadcast channel, refer to
Using the Wireless Radio Option on
page 67
.
2.4GHz Channels
The following diagram displays the 2.4GHz channels available in the Americas. Each
available channel is 22MHz wide. Since channels overlap, it is best to choose channels
that have the least overlap (typically 1, 6, and 11 in the Americas, and 1, 5, 9, and 13 in
Europe). Overlapping channels can cause wireless network performance issues.
Band
2.4GHz
5GHz
Channels
In the USA, channels 1-11 are used. There
are 3 non-overlapping channels (1, 6, and
11). Auto channel should be selected to
ensure that the channel with the least
interference is used.
23 non-overlapping channels.
Standards
802.11b,g,n
802.11a,n
Network
Range
Wider range
Shorter Range
Interference
Higher, as many wireless devices such as
cordless phones, microwave ovens, and
computers use the 2.4GHz frequency.
Lower chance of picking up interference
because fewer types of wireless devices
use the 5GHz frequency.
Application
Recommended for simple Internet
browsing and email, as these applications
don’t take too much bandwidth and work
fine at a greater distance.
Recommended for applications that
require uninterrupted throughput, like
media streaming. The wider spectrum
delivers better performance.
Note:
If you want to use the 5GHz frequency, all wireless client adapters must support 5GHz.

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