Chapter 8 Wireless Screen
NWA-3160 Series User’s Guide
129
The following table shows how priorities are assigned for packets coming from the
LAN to the WLAN.
8.3.3.2 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.
8.3.4 Type Of Service (ToS)
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.
8.3.4.1 DiffServ
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
based on the application types and traffic flow. Packets are marked with DiffServ
Code Points (DSCPs) indicating the level of service desired. This allows the
intermediary DiffServ-compliant network devices to handle the packets differently
depending on the code points without the need to negotiate paths or remember
state information for every flow. In addition, applications do not have to request a
particular service or give advanced notice of where the traffic is going.
Table 27 ATC + WMM Priority Assignment (LAN to WLAN)
PACKET SIZE
(BYTES)
ATC VALUE WMM VALUE
1 ~ 250 ATC_High WMM_VIDEO
250 ~ 1100 ATC_Mediu
m
WMM_BEST_EFFORT
1100 + ATC_Low WMM_BACKGROUND
Table 28 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_BACKGROUN
D
ATC_Low
NONE ATC_Medium
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