Siemens CP 1515 Instruções de Operação Página 150

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Configuration Using Web Based Management and the Command Line Interface
C79000-G8976-C184-07
150
kage
bled into the original size after they have
re difficult to transmit. However fragmentation into smaller
roughput.
Repetition
is
t immediately. The number of attempted repetitions is specified with the HW
Retry number parameter.
If the number of retries is reached without success, the packet is temporarily
nd all other packets in the buffer are sent first. Following this,
transmission of the packet is attempted again. The number of such repetitions is
nabled or
Shortened
Note
If you are using the CP 1515 and CP 7515 communications processors in one
wireless cell at the same time, the shortened preamble should not be used
otherwise the CP 1515 can only handle a significantly reduced amount of data
traffic when there is heavy load on the network.
Fragmentation
The Fragmentation Length Threshold parameter specifies the maximum pac
size transferred on the radio link. Large packets are divided up into small packets
prior to transmission and then reassem
been received. This can be beneficial if the transmission quality is poor because
larger packets are mo
packets means a poorer th
s
There are two situations in which packets are repeated. The hardware repetition
performed by the WLAN chip itself when it tries to repeat an unacknowledged
packe
withdrawn a
specified with the SW Retry number parameter.
Using Use SW Retry, the software repetition mechanism can be e
disabled.
Preamble with 802.11b
The 802.11b standard allows the use of shortened preambles in the wireless
transmission of data packets. This increases the amount of user data.
Antenna Gain
The Antenna Gain parameter describes the antenna gain in dBi of an antenna
connected to a SCALANCE W.
There are now two boxes that can be selected: "Antenna Gain" and "Antenna
Type". If "Antenna Type" is set to "User Defined", any antenna gain can be entered
in Antenna Gain. Otherwise, the preconfigured value of the selected "Antenna
Type" is displayed.
It is necessary to set a specific value to make sure that the regulations of the
national authorities are adhered to. The national authorities, for example, specify all
usable channels, the corresponding maximum transmit power and other conditions
of use. You will find more detailed information on the regulations in your country
using the countrylist.log.
Operating Instructions SCALANCE W78x
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