ZyXEL Communications NWA570N User Manual page 71

Table 16 Wireless Settings: AP + Repeater (continued)
LABEL
Radio Enable
A-MPDU
aggregation
A-MSDU
aggregation
RIFS
Short GI
Output Power
Management
Data Rate
Management
Channel Mode Select whether the NWA570N uses a wireless channel bandwidth of 20 or 40
Extension
channel
protection
mode
Preamble
Type
ZyXEL NWA570N User's Guide
DESCRIPTION
Turn on the wireless adapter to allow wireless communications between the
device and other IEEE 802.11b and IEEE 802.11g compliant wireless devices.
Turn off the wireless adapter to stop wireless communications between the device
and other IEEE 802.11b and IEEE 802.11g compliant wireless devices.
Select Yes to enable the grouping of several A-MSDU (Aggregate MAC Service
Data Units) into one large A-MPDU (Aggregate MAC Protocol Data Unit). When
combined with A-MSDU aggregation this function allows faster data transfer
rates.
Select Yes to enable the grouping of small groups of data (MAC Service Data
Units, or MSDU) into one large unit of MSDUs called an Aggregate MSDU (A-
MSDU).
Select Yes to enable RIFS (Reduced Interframe Spacing) and to increase data
transfer rates.
Select Yes or No to enable or disable GI (Guard Interval). The GI refers to the
interval given 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.
Set the output power of the device in this field. If there is a high density of APs
within an area, decrease the device's output power to reduce interference with
other APs.
The options are Full, 50%, 25%, 12% and Min.
Use this field to select a maximum data rate for the wireless connection(s). Please
note that this is a total rate to be shared by all of the device's wireless connections.
MHz. A standard 20MHz channel offers transfer speeds of up to 150Mbps
whereas a 40MHz channel uses two standard channels and offers speeds of up to
300Mbps. However, not all devices support 40MHz channels. Select 20/49 MHz to
allow the NWA570N to adjust the channel bandwidth depending on network
conditions.
If you have only IEEE wireless 802.1n draft 2.0 compatible devices on your
network, select None.
If you have devices that are not compatible with IEEE wireless 802.1n draft 2.0
and you have selected a Channel Mode of 40 Mhz, select CTS to self. CTS to
self and RTS-CTS are both kinds of protection mechanisms, similar to HT
protect. Both decrease data transfer speeds but CTS to self is more efficient.
Preamble is used to signal that data is coming to the receiver.
Short preamble increases performance as less time sending preamble means
more time for sending data. All IEEE 802.11b compliant wireless adapters support
long preamble, but not all support short preamble.
Select Long preamble if you are unsure what preamble mode the wireless
adapters support, and to provide more reliable communications in busy wireless
networks.
Select Dynamic to have the device automatically use short preamble when all
wireless clients support it, otherwise the device uses long preamble.
Note: The device and the wireless stations MUST use the same
preamble mode in order to communicate.
Chapter 6 Wireless Screens
71