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Page 91 / 114 Scroll up to view Page 86 - 90
Ubee Interactive
Deploying and Troubleshooting the Wireless Network
Ubee DVW32CB Advanced Wireless Voice Gateway Subscriber User Guide
•
January 2015
87
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 81
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 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 DVW32CB. Refer to
Connecting Devices to
the Network on page 11
if needed.
2.
Place the wireless client at around one meter (three feet) away from the DVW32CB.
3.
Obtain the
RSSI
value for the connected client. Refer to
Using the Access Control
Option on page 81
. 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.
5.
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
Double Pane Coated Glass
13dB
20dB
Bullet Proof Glass
10dB
20dB
Steel / Fire Exit Door
13dB to 19dB
25dB to 32dB
Page 92 / 114
Ubee Interactive
Deploying and Troubleshooting the Wireless Network
Ubee DVW32CB Advanced Wireless Voice Gateway Subscriber User Guide
•
January 2015
88
6.
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 DVW32CB 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
7.
Once you know the optimal feet distance between individual wireless clients and the
DVW32CB, you may resolve and prevent some performance issues.
8.
Check the wireless signal strength and speed of the computer connected wirelessly to
the DVW32CB. 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 12
.
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 93 / 114
Ubee Interactive
Deploying and Troubleshooting the Wireless Network
Ubee DVW32CB Advanced Wireless Voice Gateway Subscriber User Guide
•
January 2015
89
9.7.3
Understanding the 2.4GHz and 5GHZ Bands
The DVW32CB 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 94 / 114
Ubee Interactive
Deploying and Troubleshooting the Wireless Network
Ubee DVW32CB Advanced Wireless Voice Gateway Subscriber User Guide
•
January 2015
90
9.7.4
Selecting a Wireless Channel
You may need to change the wireless channel on which the DVW32CB 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 74
.
2.4GHz Channels
The following diagram displays the 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.
Page 95 / 114
Ubee Interactive
Deploying and Troubleshooting the Wireless Network
Ubee DVW32CB Advanced Wireless Voice Gateway Subscriber User Guide
•
January 2015
91
Source: Wikipedia.org, and IEEE article IEEE 802.11n-2009
5GHz Channels
The following table shows the 5GHz channel list and the corresponding frequencies.
Channel
GHz
Channel
GHz
36
5.180
108
5.540
40
5.200
112
5.560
44
5.220.
116
5.580
48
5.240
136
5.680
52
5.260
140
5.700
56
5.280
149
5.745
60
5.300
153
5.765
64
5.320
157
5.785
100
5.500
161
5.805
104
5.520
165
5.825

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