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Lancom L-320agn Wireless Manual

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LANCOM L-32x Access Point series
Chapter 5: Advanced wireless LAN configuration
58
EN
Double bandwidth (40 MHz channels)
A wireless LAN module normally uses a frequency range of 20 MHz in
which data to be transmitted is modulated to the carrier signals. 802.11a/
b/g use 48 carrier signals in a 20 MHz channel. The use of double the fre-
quency range of 40 MHz means that 96 carrier signals can be used, resul-
ting in a doubling of the data throughput.
802.11n can use 52 carrier signals in one 20 MHz channel for modulation
and up to 108 in a 40 MHz channel. The use of the 40 MHz option for
802.11n therefore means a performance gain of more than double.
Antenna grouping
The L-32x Access Points use two antennas for transmitting and receiving
data. Using several antennas with 802.11n can have different purposes:
Improved data throughput: Using "spatial multiplexing" allows par-
allel data streams to be implemented to transmit double the amount
of data.
Improving wireless coverage: Cyclic shift diversity (CSD) can be used
to transmit a radio signal in different phases. This reduces the risk of
the signal being erased at certain points in the radio cell.
Depending on the application the use of the antennas can be set:
When using the device in Access Point mode to connect wireless LAN
clients it is necessary to use all antennas in parallel in order to profit
from the MIMO effect and to achieve good network coverage.
For applications with only one antenna (for example an outdoor
application with just one antenna) the antenna is connected to port 1
and port 2 should be deactivated
The ''Auto' setting means that all available antennas are used.
5.2.3 Performance settings for wireless LAN networks
Some performance settings can be configured separately for each logical
wireless LAN network (i.e. for each SSID).
Number of spatial streams
The spatial multiplexing function allows several separate data streams to
be transmitted over separate antennas in order to increase data through-
put. When using external antennas, please observe that the number of
spatial streams can be transmitted by the antenna system (e.g. two with
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