Technical Reference; Wmm Qos - ZyXEL Communications NWA-1100 Manual

Table 14 Wireless > Wireless Settings: MBSSID (continued)
LABEL
Extension channel
protection mode
A-MPDU aggregation
Short GI
Rates Configuration
MCS Table
Apply
Cancel

6.5 Technical Reference

This section provides technical background information about the topics covered in this chapter.
Refer to Appendix E on page 191

6.5.1 WMM QoS

WMM (Wi-Fi MultiMedia) QoS (Quality of Service) ensures quality of service in wireless networks. It
controls WLAN transmission priority on packets to be transmitted over the wireless network.
WMM QoS prioritizes wireless traffic according to the delivery requirements of the individual and
applications. WMM QoS is a part of the IEEE 802.11e QoS enhancement to certified Wi-Fi wireless
networks.
NWA1100-N User's Guide
DESCRIPTION
You can use CTS to self or RTS-CTS protection mechanism to reduce
conflicts with other wireless networks or hidden wireless clients. The
throughput of RTS-CTS is much lower than CTS to self. Using this mode
may decrease your wireless performance.
This field is available only when 802.11 b/g/n is selected as the Wireless
Mode. Select Enable to allow the grouping of several A-MSDUs (Aggregate
MAC Service Data Units) into one large A-MPDU (Aggregate MAC Protocol
Data Unit). This function allows faster data transfer rates.
This field is available only when 802.11 b/g/n is selected as the Wireless
Mode. Select Enable to use Short GI (Guard Interval). The guard interval
is the gap introduced between data transmission from users in order to
reduce interference. Reducing the GI increases data transfer rates but also
increases interference. Increasing the GI reduces data transfer rates but
also reduces interference.
This section controls the data rates permitted for clients.
For each Rate, select an option from the Configuration list. The options
are:
• Basic (1~11 Mbps only): Clients can always connect to the access point
at this speed.
• Optional: Clients can connect to the access point at this speed, when
permitted to do so by the AP.
• Disable: Clients cannot connect to the access point at this speed.
The MCS Rate table is available only when 802.11 b/g/n is selected in the
802.11 Wireless Mode field.
IEEE 802.11n supports many different data rates which are called MCS
rates. MCS stands for Modulation and Coding Scheme. This is an 802.11n
feature that increases the wireless network performance in terms of
throughput.
For each MCS Rate (0-15), select either Enable (default) to have the NWA
use the data rate. Select Disable if you do not want the NWA to use the
data rate.
Click Apply to save your changes.
Click Cancel to begin configuring this screen afresh.
for further readings on Wireless LAN.
Chapter 6 Wireless Settings Screen
75