Atc+Wmm; Atc+Wmm From Lan To Wlan; Atc+Wmm From Wlan To Lan; Table 17 Atc + Wmm Priority Assignment (Lan To Wlan) - ZyXEL Communications ZyXEL NWA3550 User Manual

Chapter 7 Wireless Configuration
You should activate ATC on the ZyXEL Device if your wireless network includes networking
devices that do not support WMM QoS, or if you want to prioritize traffic but do not want to
configure WMM QoS settings.

7.3.3 ATC+WMM

The ZyXEL Device can use a mapping mechanism to use both ATC and WMM QoS. The
ATC+WMM function prioritizes all packets transmitted onto the wireless network using
WMM QoS, and prioritizes all packets transmitted onto the wired network using ATC. See
Section 9.2.2 on page 127
Use the ATC+WMM function if you want to do the following:
• enable WMM QoS on your wireless network and automatically assign a WMM priority to
packets that do not already have one (see
• automatically prioritize all packets going from your wireless network to the wired network
(see Section 7.3.3.2 on page

7.3.3.1 ATC+WMM from LAN to WLAN

ATC+WMM from LAN (the wired Local Area Network) to WLAN (the Wireless Local Area
Network) allows WMM prioritization of packets that do not already have WMM QoS
priorities assigned. The ZyXEL Device automatically classifies data packets using ATC and
then assigns WMM priorities based on that ATC classification.
The following table shows how priorities are assigned for packets coming from the LAN to the
WLAN.

Table 17 ATC + WMM Priority Assignment (LAN to WLAN)

PACKET SIZE (BYTES)
1 ~ 250
250 ~ 1100
1100 +

7.3.3.2 ATC+WMM from WLAN to LAN

ATC+WMM from WLAN to LAN automatically prioritizes (assigns an ATC value to) all
packets coming from the WLAN. Packets are assigned an ATC value based on their WMM
value, not their size.
The following table shows how priorities are assigned for packets coming from the WLAN to
the LAN when using ATC+WMM.

Table 18 ATC + WMM Priority Assignment (WLAN to LAN)

WMM VALUE
WMM_VOICE
WMM_VIDEO
WMM_BEST_EFFORT
WMM_BACKGROUND
NONE
94
for details of how to configure ATC+WMM.
Section 7.3.3.1 on page
94).
ATC VALUE
ATC_High
ATC_Medium
ATC_Low
ATC VALUE
ATC_High
ATC_High
ATC_Medium
ATC_Low
ATC_Medium
94).
WMM VALUE
WMM_VIDEO
WMM_BEST_EFFORT
WMM_BACKGROUND
NWA3550 User's Guide