Bedienungsanleitung D-Link DWL-6620APS (Seite 44 von 136) (Englisch)

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Unied Access Point Administrator’s Guide

Page 44

October 2017

Section 4 - Managing the Access Point

Field Description

Primary Channel

(802.11n modes

only)

This setting can be changed only when the channel bandwidth is set to 40 MHz. A 40 MHz

channel can be considered to consist of two 20 MHz channels that are contiguous in the

frequency domain. These two 20 MHz channels are often referred to as the Primary and

Secondary channels. The Primary Channel is used for 802.11n clients that support only a

20 MHz channel bandwidth and for legacy clients.

Select one of the following options:

•) Lower — Set the Primary Channel as the lower 20 MHz channel in the 40 MHz band.

•) Upper — Set the Primary Channel as the upper 20 MHz channel in the 40 MHz band.

DFS Support This eld is available only if the selected radio mode operates in the 5 GHz frequency.

For radios in the 5 GHz band, when DFS support is on and the regulatory domain requires

radar detection on the channel, the Dynamic Frequency Selection (DFS) and Transmit

Power Control (TPC) features of 802.11h are activated.

DFS is a mechanism that requires wireless devices to share spectrum and avoid co-channel

operation with radar systems in the 5 GHz band. DFS requirements vary based on the

regulatory domain, which is determined by the country code setting of the AP.

Short Guard Interval

Supported

This eld is available only if the selected radio mode includes 802.11n.

The guard interval is the dead time, in nanoseconds, between OFDM symbols. The guard

interval prevents Inter-Symbol and Inter-Carrier Interference (ISI, ICI). The 802.11n mode

allows for a reduction in this guard interval from the a and g denition of 800 nanoseconds

to 400 nanoseconds. Reducing the guard interval can yield a 10% improvement in data

throughput.

Select one of the following options:

•) Yes — The AP transmits data using a 400ns guard Interval when communicating with

clients that also support the short guard interval.

•) No — The AP transmits data using an 800ns guard interval.

Multidomain

Regulatory Mode

This feature is congurable on a per radio basis. By default, it is enabled. Multidomain

Regulatory Mode (World Mode) causes the AP to broadcast which country it is operating in

as a part of its beacons and probe responses. This allows client stations to operate in any

country without re-conguration.

Disabling this feature prevents the country code setting from being broadcast in the

beacons. However, this only applies to radios congured to operate in the g band (2.4 GHz

band). For radios operating in the a band (5 GHz band), the AP software congures support

for 802.11h. When 802.11h is supported, the country code information is broadcast in the

beacons.

To enable Multidomain Regulatory Mode support, click Enabled.

To disable Multidomain Regulatory Mode support, click Disabled.

STBC Mode This eld is available only if the selected radio mode includes 802.11n.

Space Time Block Coding (STBC) is an 802.11n technique intended to improve the reliability

of data transmissions. The data stream is transmitted on multiple antennas so the receiving

system has a better chance of detecting at least one of the data streams.

Select one of the following options:

•) On — The AP transmits the same data stream on multiple antennas at the same time.

•) Off — The AP does not transmits the same data on multiple antennas.

Protection The protection feature contains rules to guarantee that 802.11n transmissions do not cause

interference with legacy stations or APs. By default, these protection mechanisms are

enabled (Auto). With protection enabled, protection mechanisms will be invoked if legacy

devices are within range of the AP. This causes more overhead on every transmission,

which will impact performance. However, there is no impact on performance if there are no

legacy devices within range of the AP.

You can disable (Off) these protection mechanisms; however, when 802.11n protection is

off, legacy clients or APs within range can be affected by 802.11n transmissions. The 802.11

protection feature is also available when the mode is 802.11b/g. When protection is enabled

in this mode, it protects 802.11b clients and APs from 802.11g transmissions.

Note: This setting does not affect the ability of the client to associate with the AP.

Beacon Interval Beacon frames are transmitted by an AP at regular intervals to announce the existence

of the wireless network. The default behaviour is to send a beacon frame once every 100

milliseconds (or 10 per second).

Enter a value from 20 to 2000 milliseconds.

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