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Ubee Interactive
Using the Bridging Option
Ubee DVW326 Advanced Wireless Voice Gateway Subscriber User Guide
•
March 2014
82
9.6
Using the Bridging Option
Use the
Bridging
option to configure the DVW326 to act as a wireless network bridge and
establish wireless links with other wireless access points. To establish a bridge, you need
to know the MAC address of the peer device. The peer device must be in wireless
bridging mode as well. The DVW326 can establish up to four wireless links with other
wireless access points. When wireless devices are in wireless bridging mode, they form a
wireless distribution system that allows computers in one LAN to connect to the
computers in the other LAN.
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.
CWmin
CWmax
AIFSN
TXOP (b) Limit (usec)
TXOP (a/g) Limit (usec)
Discard Oldest First
Sets the time for the following fields:
CWmin
– Contention window minimum
CWmax
– Contention window maximum
AIFS
– Arbitration inter-frame space
TXOP
– Transmit opportunity
Discard Oldest First
– Removes oldest frame when set to
On.
EDCA STA Parameters
Allows you to prioritize wireless network traffic for receiving
terminals. Access categories are:
AC_BE
– Best Effort, medium throughput and delay. Most
traditional IP data is sent to this queue.
AC_BK
– Background, high throughput. Bulk data that
requires maximum throughput and is not time-sensitive is
sent to this queue (for example, FTP data).
AC_VI
– Video
AC_VO
– Voice
WMM TXOP Parameters
Allows you to prioritize wireless network traffic for wireless
multimedia transmit opportunities. Access categories are:
AC_BE
– Best Effort, medium throughput and delay. Most
traditional IP data is sent to this queue.
AC_BK
– Background, high throughput. Bulk data that
requires maximum throughput and is not time-sensitive is
sent to this queue (for example, FTP data).
AC_VI
– Video
AC_VO
– Voice
Short Retry Limit
Short Fallbk Limit
Long Retry Limit
Long Fallbk Limit
Max Rate in 500kbps
Defines how many times the MAC retries to send different types
of packets. If the number of retries reach their limit, the frame is
discarded.
Apply
Saves all changes.
Page 87 / 119
Ubee Interactive
Deploying and Troubleshooting the Wireless Network
Ubee DVW326 Advanced Wireless Voice Gateway Subscriber User Guide
•
March 2014
83
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 84
Selecting a Wireless Channel on page 87
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
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 88 / 119
Ubee Interactive
Deploying and Troubleshooting the Wireless Network
Ubee DVW326 Advanced Wireless Voice Gateway Subscriber User Guide
•
March 2014
84
To determine the received signal strength, refer to
Using the Access Control Option on
page 78
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.
Estimating Wireless Cable Modem to Wireless Client Distances
The information in this section helps you to determine how far a wireless access point (the
DVW326) 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 DVW326 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 cable modem. Refer to
Connecting Devices to
the Network on page 14
if needed.
2.
Place the wireless client at around one meter (three feet) away from the DVW326.
3.
Obtain the
RSSI
value for the connected client. Refer to
Using the Access Control
Option on page 78
. 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 at 2.4GHz
Material
Attenuation
Connector/Cable
3.5dB
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
Glass Window (not tinted)
2dB to 3dB
Double Pane Coated Glass
13dB
Bullet Proof Glass
10dB
Steel / Fire Exit Door
13dB to 19dB
Page 89 / 119
Ubee Interactive
Deploying and Troubleshooting the Wireless Network
Ubee DVW326 Advanced Wireless Voice Gateway Subscriber User Guide
•
March 2014
85
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 Cable Modem 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
wireless cable modem, you may resolve and prevent some performance issues.
7.
Check the wireless signal strength and speed of the computer connected wirelessly to
the DVW326. 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 13
.
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 at 2.4GHz
Material
Attenuation
Page 90 / 119
Ubee Interactive
Deploying and Troubleshooting the Wireless Network
Ubee DVW326 Advanced Wireless Voice Gateway Subscriber User Guide
•
March 2014
86
1.8.1
Understanding the 2.4GHz Band
The DVW326 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

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