Bedienungsanleitung D-Link DWL-6620APS (Seite 76 von 136) (Englisch)

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Unied Access Point Administrator’s Guide

Page 76

October 2017

Section 5 - Conguring Access Point Services

Field Description

cwMin (Minimum

Contention Window)

This parameter is used by the algorithm that determines the initial random back off wait

time (window) for retry of a data transmission during a period of contention for Unied

Access Point resources. The value specied here in the Minimum Contention Window is

the upper limit (in milliseconds) of a range from which the initial random back off wait time

will be determined. The rst random number generated will be a number between 0 and the

number specied here. If the rst random back off wait time expires before the data frame

is sent, a retry counter is incremented and the random back off value (window) is doubled.

Doubling will continue until the size of the random back off value reaches the number

dened in the Maximum Contention Window.

cwMax (Maximum

Contention Window)

The value specied here in the Maximum Contention Window is the upper limit (in

milliseconds) for the doubling of the random back off value. This doubling continues until

either the data frame is sent or the Maximum Contention Window size is reached.

Once the Maximum Contention Window size is reached, retries will continue until a

maximum number of retries allowed is reached.

TXOP Limit The TXOP Limit is a station EDCA parameter and only applies to trafc owing from the

client station to the AP. The Transmission Opportunity (TXOP) is an interval of time, in

milliseconds, when a WME client station has the right to initiate transmissions onto the

wireless medium (WM) towards the Unied Access Point. The TXOP Limit maximum value is

65535.

Other QoS Settings

Acknowledgement

Select On to specify that the AP should not acknowledge frames with QosNoAck as the

service class value.

APSD Select On to enable Automatic Power Save Delivery (APSD), which is a power management

method. APSD is recommended if VoIP phones access the network through the AP.

Note: After you congure the QoS settings, you must click Apply to apply the changes and to save

the settings. Changing some settings might cause the AP to stop and restart system processes. If

this happens, wireless clients will temporarily lose connectivity. We recommend that you change

AP settings when WLAN trafc is low.

Table 44 - QoS Settings

Conguring Email Alert

The Email Alert feature allows the AP to automatically send email messages when an event at or above the congured

severity level occurs. Use the Email Alert Conguration page to congure mail server settings, to set the severity level

that triggers alerts, and to add up to three email addresses where urgent and non-urgent email alerts are sent.

Note: Email alert is operationally disabled when the AP transitions to managed mode.

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