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Operation Mode
Mixed Mode
– the router can transmit data with the ways
supported in both 802.11a/b/g and 802.11n standards. However,
the entire wireless transmission will be slowed down if 802.11g
or 802.11b wireless client is connected.
Green Field
– to get the highest throughput, please choose such
mode. Such mode can make the data transmission happening
between 11n systems only. In addition, it does not have
protection mechanism to avoid the conflict with neighboring
devices of 802.11a/b/g.
Channel Bandwidth
20-
the router will use 20Mhz for data transmission and
receiving between the AP and the stations.
20/40 –
the router will use 20Mhz or 40Mhz for data
transmission and receiving according to the station capability.
Such channel can increase the performance for data transit.
Guard Interval
It is to assure the safety of propagation delays and reflections
for the sensitive digital data. If you choose
auto
as guard
interval, the AP router will choose short guard interval
(increasing the wireless performance) or long guard interval for
data transmit based on the station capability.
Aggregation MSDU
Aggregation MSDU can
combine frames with different
sizes.
It is used for improving MAC layer’s performance for
some brand’s clients. The default setting is
Enable.
4.12.8 WMM Configuration
WMM is an abbreviation of Wi-Fi Multimedia. It defines the priority levels for four access
categories derived from 802.1d (prioritization tabs). The categories are designed with
specific types of traffic, voice, video, best effort and low priority data. There are four
accessing categories - AC_BE , AC_BK, AC_VI and AC_VO for WMM.
APSD (automatic power-save delivery) is an enhancement over the power-save mechanisms
supported by Wi-Fi networks. It allows devices to take more time in sleeping state and
consume less power to improve the performance by minimizing transmission latency. Such
function is designed for mobile and cordless phones that support VoIP mostly.
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WMM Capable
To apply WMM parameters for wireless data transmission,
please click the
Enable
radio button.
APSD Capable
The default setting is
Disable
.
Aifsn
It controls how long the client waits for each data transmission.
Please specify the value ranging from 1 to 15. Such parameter
will influence the time delay for WMM accessing categories.
For the service of voice or video image, please set small value
for AC_VI and AC_VO categories For the service of e-mail or
web browsing, please set large value for AC_BE and AC_BK
categories.
CWMin/CWMax
CWMin
means contention Window-Min and
CWMax
means
contention Window-Max. Please specify the value ranging from
1 to 15. Be aware that CWMax value must be greater than
CWMin or equals to CWMin value. Both values will influence
the time delay for WMM accessing categories. The difference
between AC_VI and AC_VO categories must be smaller;
however, the difference between AC_BE and AC_BK
categories must be greater.
Txop
It means transmission opportunity. For WMM categories of
AC_VI and AC_VO that need higher priorities in data
transmission, please set greater value for them to get highest
transmission opportunity. Specify the value ranging from 0 to
65535.
ACM
It is an abbreviation of Admission control Mandatory. It can
restrict stations from using specific category class if it is
checked.
Note:
Vigor2830 provides standard WMM configuration in the
web page. If you want to modify the parameters, please refer to
the Wi-Fi WMM standard specification.
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AckPolicy
Uncheck” (default value) the box means the AP router will
answer the response request while transmitting WMM packets
through wireless connection. It can assure that the peer must
receive the WMM packets.
“Check” the box means the AP router will not answer any
response request for the transmitting packets. It will have better
performance with lower reliability.
4.12.9 AP Discovery
Vigor router can scan all regulatory channels and find working APs in the neighborhood.
Based on the scanning result, users will know which channel is clean for usage. Also, it can
be used to facilitate finding an AP for a WDS link. Notice that during the scanning process
(about 5 seconds), no client is allowed to connect to Vigor.
This page is used to scan the existence of the APs on the wireless LAN. Yet, only the AP
which is in the same channel of this router can be found. Please click
Scan
to discover all the
connected APs.
Scan
It is used to discover all the connected AP. The results will be
shown on the box above this button.
Statistics
It displays the statistics for the channels used by APs.
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Add to
If you want the found AP applying the WDS settings, please
type in the AP’s MAC address on the bottom of the page and
click Bridge or Repeater. Next, click
Add to
. Later, the MAC
address of the AP will be added to Bridge or Repeater field of
WDS settings page.
4.12.10 Station List
Station List
provides the knowledge of connecting wireless clients now along with its status
code. There is a code summary below for explanation. For convenient
Access Control
, you
can select a WLAN station and click
Add to Access Control
below.
Refresh
Click this button to refresh the status of station list.
Add
Click this button to add current typed MAC address into
Access
Control.
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4.13 USB Application
USB disk can be regarded as an FTP server. By way of Vigor router, clients on LAN can
access, write and read data stored in USB disk. After setting the configuration in
USB
Application
, you can type the IP address of the Vigor router and username/password created
in
USB Application>>USB User Management
on the FTP client software. Thus, the client
can use the FTP site (USB disk) through Vigor router.
4.13.1 USB General Settings
This page will determine the number of concurrent FTP connection and default charset for
FTP server. At present, the Vigor router can support USB disk with versions of FAT16 and
FAT32 only. Therefore, before connecting the USB disk into the Vigor router, please make
sure the memory format for the USB disk is FAT16 or FAT32. It is recommended for you to
use FAT32 for viewing the filename completely (FAT16 cannot support long filename).
General Settings
Simultaneous FTP Connections -
This field is used to
specify the quantity of the FTP sessions. The router allows
up to 6 FTP sessions connecting to USB storage disk at one
time.
Default Charset -
At present, Vigor router supports three
types of character sets: default, GB2312 and BIG5.

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