User's Manual

Page 7 | How To: Configure the WLAN with QoS alliedtelesis.com
How to configure Wi-Fi Multimedia
Use the command: traffic-class to set the EDCA back off criteria for the required
WMM access category:
On collisions, WMM sets the back off time within the CWmin range and uses a
persistence factor (PF) as the coefficient that multiplies the contention window
size in successive retransmission attempts following a collision.
Parameter descriptions
cw-min (Contention Window minimum)
That is the random wait time before retrying the transmission; the initial size of the
contention window is within 0~CW
min
back off slots.
The value specifies the number of back off slots as a power of 2
n
-1; in example,
cw-min 3 means 2
3
-1=7 back off slots.
cw-min 0 means 2
0
-1=0 back off slots.
cw-max (Contention Window maximum)
That is the maximum size of the contention window.
The value specifies the number of back off slots as a power of 2
n
-1.
fixed-slot (Arbitrary Inter-Frame Space)
That is the predefined idle time that the station waits before starting the contention
window (CW) .
The value specifies the number of back off slots.
Note:
WMM setup may only be entered on a wireless node with an access point role.
It will distribute the QoS policies to “slave” nodes, for example, non-root bridge,
workgroup-bridge, etc.
Note:
Refer to “AT-WR4600 – Command Reference Guide”, for default settings and
recommended configuration for the different W LAN topologies (access point,
bridging, etc.).
traffic-class [background|best-effort|video|voice]
cw-min <0-10> cw-max <0-10> fixed-slot <2-20>
no traffic-class [background|best-effort|video|voice]