4 ap+repeater mode – ZyXEL Communications NWA570N User Manual
Page 68
Chapter 6 Wireless Screens
ZyXEL NWA570N User’s Guide
68
6.4.4 AP+Repeater Mode
Select AP+Repeater as the Operation Mode to have the device act as an access point and a
wireless bridge.
Preamble
Type
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.
Channel Mode Select whether the NWA570N uses a wireless channel bandwidth of 20 or 40
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.
Extension
channel
protection
mode
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.
RTS/CTS
Threshold
RTS/CTS is designed to prevent collisions due to hidden nodes. You should only
configure RTS/CTS if the possibility of hidden nodes exists on your network and
the "cost" of resending large frames is more than the extra network overhead
involved in the RTS (Request To Send)/CTS (Clear to Send) handshake.
Enter a value between 0 and 65535. Data with a frame size larger than this value
will perform the RTS/CTS handshake.
If the RTS/CTS value is greater than the Fragmentation value, then the RTS/CTS
handshake will never occur as data frames will be fragmented before they reach
RTS/CTS size.
See
for more information.
Fragmentation Enter a value between 256 and 65534. It is the maximum data fragment size that
can be sent.
A large Fragmentation Threshold is recommended for networks not prone to
interference while you should set a smaller threshold for busy networks or
networks that are prone to interference.
See
for more information.
Apply
Click Apply to save your changes back to the device.
Reset
Click Reset to begin configuring this screen afresh.
Table 15 Wireless Settings: Bridge (continued)
LABEL
DESCRIPTION