ZyXEL Communications NWA-3163 & NWA-3166 User Manual

Chapter 9 SSID Screen

NWA-3160 Series User’s Guide

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 NWA 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. 

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. 

Network traffic can be classified by setting the ToS (Type Of Service) values at the 
data source (for example, at the NWA) so a server can decide the best method of 
delivery, that is the least cost, fastest route and so on. 

DiffServ is a class of service (CoS) model that marks packets so that they receive 
specific per-hop treatment at DiffServ-compliant network devices along the route 

Table 34   ATC + WMM Priority Assignment (LAN to WLAN)

1 ~ 250

ATC_High 

WMM_VIDEO

250 ~ 1100

ATC_Mediu
m

WMM_BEST_EFFORT

1100 +

ATC_Low

WMM_BACKGROUND

Table 35   ATC + WMM Priority Assignment (WLAN to LAN)

WMM_VOICE

ATC_High

WMM_VIDEO

ATC_High

WMM_BEST_EFFORT

ATC_Medium

WMM_BACKGROUN
D

ATC_Low

NONE

ATC_Medium