HP PS110, Руководство по настройке и администрированию

Страница: 66 / 136

66 Wireless configuration
Enable Power Saving
The WMM-Power Save feature enables mobile client devices to extend battery life by going
into a sleep mode between sending and receiving data.
WMM Parameters
The WMM table includes these parameters:
•
AC_BK
: Access Category - Background. Lowest priority. Data with no delay or throughput
requirement, such as bulk data transfers.
•
AC_BE
: Access Category - Best Effort. Normal priority, medium delay and throughput.
Data only affected by long delays. Data from applications or devices that lack QoS
capabilities.
•
AC_VI
: Access Category - Video. High priority, minimum delay. Time-sensitive data such
as streaming video.
•
AC_VO
: Access Category - Voice. Highest priority, minimum delay. Time-sensitive data
such as VoIP (Voice over IP) calls.
•
CWmin
: Minimum Contention Window. The initial upper limit of the random backoff wait
time before wireless medium access can be attempted. The initial wait time is a random
value between zero and the CWMin value. Specify the CWMin value in the range 0-15
microseconds. Note that the CWMin value must be equal or less than CWMax value.
•
CWmax
: Maximum Contention Window. The maximum upper limit of the random backoff
wait time before wireless medium can be attempted. The contention window is doubled
after each detected collision up to the CWMax value. Specify the CWMax value in the
range 0-15 microseconds. Note that the CWMax must be greater or equal to the CWMin
value.
•
AIFSN
: Arbitration Inter-Frame Space Number. The minimum amount of wait time before
the next transmission attempt. Specify the AIFSN value in the range 0-15 microseconds.
•
TXOP
: Transmit Opportunity. The maximum time an AC transmit queue has access to the
wireless medium. When an AC queue is granted a transmit opportunity, it can transmit
data for a time up to the TXOP. This data bursting greatly improves the efficiency for high
data-rate traffic. Specify a value in the range 0-8192 microseconds.
•
ACM
: The admission control mode for the access category. When enabled, clients are
blocked from using the access category.
•
AckPolicy
: Acknowledge Policy. By default, all wireless data transmission requires the
sender to wait for an acknowledge message from the receiver. WMM allows the
acknowledgement wait time to be turned off for each Access Category (AC). Although this
increases data throughput, it can also result in a high number of errors when traffic levels
are heavy.