D-Link DWL-8500AP, Руководство администратора

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Enabling the Network Time Protocol Server 79
6 Configuring Access Point Services
NOTE: After you configure the QoS settings, you must click Update to apply the
changes and to save the settings. Changing some access point 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
access point settings when WLAN traffic is low.
Enabling the Network Time Protocol Server
The Network Time Protocol (NTP) is an Internet standard protocol that synchronizes
computer clock times on your network. NTP servers transmit Coordinated Universal Time
(UTC, also known as Greenwich Mean Time) to their client systems. NTP sends periodic time
requests to servers, using the returned time stamp to adjust its clock. The timestamp is used to
indicate the date and time of each event in log messages.
See http://www.ntp.org for more information about NTP.
cwMax
(Maximum Contention
Window)
The value specified here in the Maximum Contention Window is the
upper limit (in milliseconds) for the doubling of the random backoff
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.
Valid values for cwMax are 1, 3, 7, 15, 31, 63, 127, 255, 511, or 1023.
The value for cwMax can be equal to or higher than the value for
cwMin.
For more information, see “Random Backoff and Minimum / Maximum
Contention Windows” on page 72.
TXOP Limit The TXOP Limit is a station EDCA parameter and only applies to
traffic flowing from the client station to the access point.
The Transmission Opportunity (TXOP) is an interval of time when a
WMM client station has the right to initiate transmissions onto the
wireless medium.
This value specifies the Transmission Opportunity (TXOP) for client
stations; that is, the interval of time when a WMM client station has the
right to initiate transmissions on the wireless network.
The TXOP Limit range is 0 to 65535. The value is in units of 32-
microsecond periods.
Table 22.
QoS Settings
Field Description