Wavion WBS-2400 User Manual page 38

Managing Network Interfaces
Selecting the Traffic Optimization
The WBS-2400 and WBS-2400-SCT is set by default to "Capacity optimization". This mode
supports only CPE that can work in 802.11g protocol. This mode is optimized to achieve a higher
capacity when compared to 802.11b systems.
When older, 802.11b CPE are present in the covered area, is possible to allow their association to
the base station. In order to do that, please set the base station to work in "Legacy mode".
Legacy mode allows the connection of 802.11b and 802.11g CPE.
Wavion base station supports QoS applications, specifically, VoIP and Video. When "QOS
optimization" mode is enabled, the system allows only 802.11g CPE to connect. QoS Optimization
adds another level of data handling. Data is prioritized by its QoS settings, several other
parameters in the system are set automatically to give VoIP the best conditions to work.
In order to better support real-time applications, the minimum rate used by the system is
12Mbps. Please check the CPE you are using supports multicast/broadcast data sent at this rate.
This mode has best results using an outdoor CPE, like Ubiquiti's NS2, when connected in good
SNR (greater than 15dB).
QoS support is done by prioritization. The packets prioritization over WiFi is based on 4 Access
Categories defined by the WMM standard:
Voice traffic
◊
Video traffic
◊
Best effort traffic
◊
Background traffic
◊
A packet arriving at the Ethernet interface of the base station will be classified to one of the
Access categories. The classification can be done using ToS, DSCP or VLAN Priority. For
classification configuration please refer to paragraph
Note:
WMM supporting CPE must be used for uplink QoS classification. Failing to
do so will cause a bad functionality of priorization in the system.
A maximum of 20 concurrent calls with high quality (MOS > 3.8) and high TCP traffic, or 15
video concurrent streams (of 1Mbps each) are achieved when "QoS Optimization" is selected on
the WBS management interface and an NS2 is used as CPE.
Rev 4.0
For two way QoS priorization ( for example in VoIP application), a
QoS Packets Priority.
User Manual 38