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Ubee Interactive
Deploying and Troubleshooting the Wireless Network
Ubee DDW365 Advanced Wireless Gateway Subscriber User Guide
•
September 2015
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.
Steps
To determine wireless cable modem placement:
1.
Connect a wireless client to the DDW365. Refer to
Connecting Devices to the Network
on page 12
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
Page 87 / 106
Ubee Interactive
Deploying and Troubleshooting the Wireless Network
Ubee DDW365 Advanced Wireless Gateway Subscriber User Guide
•
September 2015
83
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 DDW365 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
DDW365, you may resolve and prevent some performance issues.
7.
Check the wireless signal strength and speed of the computer connected wirelessly to
the DDW365. Instructions for checking speeds are provided for both a Windows and a
Mac computer in the table below. If the wireless computer is not connected, refer to
Connecting a Wireless Device on page 12
.
Glass Window (not tinted)
2dB to 3dB
Double Pane Coated Glass
13dB
Bullet Proof Glass
10dB
Steel / Fire Exit Door
13dB to 19dB
Human Body
3dB
Trees (Note 2)
0.15dB / 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)
Page 88 / 106
Ubee Interactive
Deploying and Troubleshooting the Wireless Network
Ubee DDW365 Advanced Wireless Gateway Subscriber User Guide
•
September 2015
84
9.7.3
Understanding the 2.4GHz Band
The DDW365 operates in the 2.4GHZ frequency band. The table below provides a
information about the 2.4GHz band.
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.
Band
2.4GHz
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.
Standards
802.11b,g,n
Page 89 / 106
Ubee Interactive
Deploying and Troubleshooting the Wireless Network
Ubee DDW365 Advanced Wireless Gateway Subscriber User Guide
•
September 2015
85
9.7.4
Selecting a Wireless Channel
You may need to change the wireless channel on which the DDW365 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 66
.
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.
Source: Wikipedia.org, and IEEE article IEEE 802.11n-2009
Network Range
Wider range than the 5GHz band
Interference
Higher interference levels compared to the 5GHz band, as many wireless
devices such as cordless phones, microwave ovens, and computers use the
2.4GHz 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.
Band
2.4GHz
Page 90 / 106
Ubee DDW365 Advanced Wireless Gateway Subscriber User Guide
•
September 2015
86
10
Understanding the USB Menu
The
USB
menu
of the Web user interface allows you to configure USB storage devices
and media file scanning.
Topics
See the following topics:
Using the USB Basic Option on page 86
Using the Approved Devices Option on page 87
Using the Storage Basic Option on page 89
Using the Storage Advanced Option on page 90
Using the Media Server Option on page 93
Steps
To access USB options:
1.
Access the Web user interface. Refer to
Accessing the Web User Interface Locally on
page 15
.
2. Click
USB
from the main menu.
10.1
Using the USB Basic Option
The
USB Basic
option allows you to configure Linux based servers. The buttons on the
right side of the page are short cuts to the options on the left side of the page.
Steps
To view USB basic information:
1.
The
USB Basic
screen is displayed. Field descriptions are listed below the screen
example.

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