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Page 116 / 367 Scroll up to view Page 111 - 115
Chapter 7 Wireless
VMG4380-B10A / VMG4325-B10A User’s Guide
116
7.7.1
WDS Scan
You can click the
Scan
icon in
Wireless > WDS
to have the Device automatically search and
display the available APs within range. Select an AP and click
Apply
to have the Device establish a
wireless link with the selected wireless device.
Figure 41
WDS: Scan
The following table describes the labels in this screen.
Remote Bridge
MAC Address
You can enter the MAC address of the peer device by clicking the
Edit
icon under
Modify
.
#
This is the index number of the entry.
MAC Address
This shows the MAC address of the peer device.
You can connect to up to 4 peer devices.
Modify
Click the
Edit
icon and type the MAC address of the peer device in a valid MAC address
format (six hexadecimal character pairs, for example 12:34:56:78:9a:bc).
Click the
Delete
icon to remove this entry.
Scan
Click the
Scan
icon to search and display the available APs within range.
Apply
Click
Apply
to save your changes.
Cancel
Click
Cancel
to restore your previously saved settings.
Table 26
Network Setting > Wireless > WDS (continued)
LABEL
DESCRIPTION
Table 27
WDS: Scan
LABEL
DESCRIPTION
Wireless Bridge Scan Setup
Refresh
Click
Refresh
to update the table.
#
This is the index number of the entry.
SSID
This shows the SSID of the available wireless device within range.
BSSID
This shows the MAC address of the available wireless device within range.
Apply
Click
Apply
to save your changes.
Cancel
Click
Cancel
to restore your previously saved settings.
Page 117 / 367
Chapter 7 Wireless
VMG4380-B10A / VMG4325-B10A User’s Guide
117
7.8
The Others Screen
Use this screen to configure advanced wireless settings. Click
Network Setting > Wireless >
Others
. The screen appears as shown.
See
Section 7.10.2 on page 121
for detailed definitions of the terms listed in this screen.
Figure 42
Network Setting > Wireless > Others
The following table describes the labels in this screen.
Table 28
Network Setting > Wireless > Others
LABEL
DESCRIPTION
RTS/CTS
Threshold
Data with its frame size larger than this value will perform the RTS (Request To Send)/CTS
(Clear To Send) handshake.
Enter a value between 0 and 2347.
Fragmentation
Threshold
This is the maximum data fragment size that can be sent. Enter a value between 256 and
2346.
Auto Channel
Timer
If you set the channel to
Auto
in the
Network Setting > Wireless > General
screen,
specify the interval in minutes for how often the Device scans for the best channel. Enter 0
to disable the periodical scan.
Output Power
Set the output power of the Device. If there is a high density of APs in an area, decrease
the output power to reduce interference with other APs. Select one of the following:
20%
,
40%
,
60%
,
80%
or
100%
.
Beacon Interval
When a wirelessly networked device sends a beacon, it includes with it a beacon interval.
This specifies the time period before the device sends the beacon again.
The interval tells receiving devices on the network how long they can wait in low power
mode before waking up to handle the beacon. This value can be set from20ms to 1000ms.
A high value helps save current consumption of the access point.
DTIM Interval
Delivery Traffic Indication Message (DTIM) is the time period after which broadcast and
multicast packets are transmitted to mobile clients in the Power Saving mode. A high DTIM
value can cause clients to lose connectivity with the network. This value can be set from 1
to 100.
Page 118 / 367
Chapter 7 Wireless
VMG4380-B10A / VMG4325-B10A User’s Guide
118
802.11 Mode
Select
802.11b Only
to allow only IEEE 802.11b compliant WLAN devices to associate with
the Device.
Select
802.11g Only
to allow only IEEE 802.11g compliant WLAN devices to associate with
the Device.
Select
802.11n
Only
to allow only IEEE 802.11n compliant WLAN devices to associate with
the Device.
Select
802.11b/g Mixed
to allow either IEEE 802.11b or IEEE 802.11g compliant WLAN
devices to associate with the Device. The transmission rate of your Device might be
reduced.
Select
802.11b/g/n Mixed
to allow IEEE 802.11b, IEEE 802.11g or IEEE802.11n
compliant WLAN devices to associate with the Device. The transmission rate of your Device
might be reduced.
802.11
Protection
Enabling this feature can help prevent collisions in mixed-mode networks (networks with
both IEEE 802.11b and IEEE 802.11g traffic).
Select
Auto
to have the wireless devices transmit data after a RTS/CTS handshake. This
helps improve IEEE 802.11g performance.
Select
Off
to disable 802.11 protection. The transmission rate of your Device might be
reduced in a mixed-mode network.
This field displays
Off
and is not configurable when you set
802.11 Mode
to
802.11b
Only
.
Preamble
Select a preamble type from the drop-down list box. Choices are
Long
or
Short
. See
Section 7.10.7 on page 125
for more information.
This field is configurable only when you set 802.11 Mode to
802.11b
.
Apply
Click
Apply
to save your changes.
Cancel
Click
Cancel
to restore your previously saved settings.
Table 28
Network Setting > Wireless > Others (continued)
LABEL
DESCRIPTION
Page 119 / 367
Chapter 7 Wireless
VMG4380-B10A / VMG4325-B10A User’s Guide
119
7.9
The Channel Status Screen
Use the
Channel Status
screen to scan wireless LAN channel noises and view the results. Click
Network Setting > Wireless > Channel Status
. The screen appears as shown. Click
Scan
to
scan the wireless LAN channels. You can view the results in the
Channel Scan Result
section.
Figure 43
Network Setting > Wireless > Channel Status
7.10
Technical Reference
This section discusses wireless LANs in depth. For more information, see
Appendix D on page 331
.
7.10.1
Wireless Network Overview
Wireless networks consist of wireless clients, access points and bridges.
•
A wireless client is a radio connected to a user’s computer.
•
An access point is a radio with a wired connection to a network, which can connect with
numerous wireless clients and let them access the network.
•
A bridge is a radio that relays communications between access points and wireless clients,
extending a network’s range.
Traditionally, a wireless network operates in one of two ways.
Page 120 / 367
Chapter 7 Wireless
VMG4380-B10A / VMG4325-B10A User’s Guide
120
•
An “infrastructure” type of network has one or more access points and one or more wireless
clients. The wireless clients connect to the access points.
•
An “ad-hoc” type of network is one in which there is no access point. Wireless clients connect to
one another in order to exchange information.
The following figure provides an example of a wireless network.
Figure 44
Example of a Wireless Network
The wireless network is the part in the blue circle. In this wireless network, devices
A
and
B
use the
access point (
AP
) to interact with the other devices (such as the printer) or with the Internet. Your
Device is the AP.
Every wireless network must follow these basic guidelines.
•
Every device in the same wireless network must use the same SSID.
The SSID is the name of the wireless network. It stands for Service Set IDentifier.
•
If two wireless networks overlap, they should use a different channel.
Like radio stations or television channels, each wireless network uses a specific channel, or
frequency, to send and receive information.
•
Every device in the same wireless network must use security compatible with the AP.
Security stops unauthorized devices from using the wireless network. It can also protect the
information that is sent in the wireless network.
Radio Channels
In the radio spectrum, there are certain frequency bands allocated for unlicensed, civilian use. For
the purposes of wireless networking, these bands are divided into numerous channels. This allows a

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