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Page 191 / 251 Scroll up to view Page 186 - 190
Vigor2920 Series User’s Guide
181
Mode
Choose the mode for WDS setting.
Disable
mode will not
invoke any WDS setting.
Bridge
mode is designed to fulfill the
first type of application.
Repeater
mode is for the second one.
Security
There are three types for security,
Disable
,
WEP
and
Pre-shared key
. The setting you choose here will make the
following WEP or Pre-shared key field valid or not. Choose one
of the types for the router.
WEP
Check this box to use
the same key set in
Security Settings
page. If you did not set any key in
Security Settings
page, this
check box will be dimmed.
Pre-shared Key
Type 8 ~ 63 ASCII characters or 64 hexadecimal digits leading
by “0x”.
Bridge
If you choose Bridge as the connecting mode, please type in the
peer MAC address in these fields.
Four peer MAC addresses are
allowed to be entered in this page at one time. Yet please
disable the unused link to get better performance. If you want to
invoke the peer MAC address, remember to check
Enable
box
in the front of the MAC address after typing.
VoIPon
www.voipon.co.uk
Tel: +44 (0)1245 808195
Fax: +44 (0)1245 808299
Page 192 / 251
Vigor2920 Series User’s Guide
182
Repeater
If you choose Repeater as the connecting mode, please type in
the peer MAC address in these fields. Four peer MAC addresses
are allowed to be entered in this page at one time. Similarly, if
you want to invoke the peer MAC address, remember to check
Enable
box in the front of the MAC address after typing.
Access Point Function
Click
Enable
to make this router serving as an access point;
click
Disable
to cancel this function.
Status
It allows user to send “hello” message to peers. Yet, it is valid
only when the peer also supports this function.
4.11.7 Advanced Setting
This page allows users to set advanced settings such as operation mode, channel bandwidth,
guard interval, and aggregation MSDU for wireless data transmission.
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.
VoIPon
www.voipon.co.uk
Tel: +44 (0)1245 808195
Fax: +44 (0)1245 808299
Page 193 / 251
Vigor2920 Series User’s Guide
183
4.11.8 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.
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
VoIPon
www.voipon.co.uk
Tel: +44 (0)1245 808195
Fax: +44 (0)1245 808299
Page 194 / 251
Vigor2920 Series User’s Guide
184
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:
Vigor2920 provides standard WMM configuration
in the web page. If you want to modify the parameters,
please refer to the Wi-Fi WMM standard specification.
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.
VoIPon
www.voipon.co.uk
Tel: +44 (0)1245 808195
Fax: +44 (0)1245 808299
Page 195 / 251
Vigor2920 Series User’s Guide
185
4.11.9 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.
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.
VoIPon
www.voipon.co.uk
Tel: +44 (0)1245 808195
Fax: +44 (0)1245 808299

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