3 atc+wmm – ZyXEL Communications NWA3550 User Manual
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Chapter 7 Wireless Configuration
NWA3550 User’s Guide
94
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
for details of how to configure ATC+WMM.
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
).
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.
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 17 ATC + WMM Priority Assignment (LAN to WLAN)
PACKET SIZE (BYTES)
ATC VALUE
WMM VALUE
1 ~ 250
ATC_High
WMM_VIDEO
250 ~ 1100
ATC_Medium
WMM_BEST_EFFORT
1100 +
ATC_Low
WMM_BACKGROUND
Table 18 ATC + WMM Priority Assignment (WLAN to LAN)
WMM VALUE
ATC VALUE
WMM_VOICE
ATC_High
WMM_VIDEO
ATC_High
WMM_BEST_EFFORT
ATC_Medium
WMM_BACKGROUND
ATC_Low
NONE
ATC_Medium