Siemens CP 1515 Instruções de Operação descarregar pdf (Página 66)

Configuration Using Web Based Management and the Command Line Interface

Operating Instructions SCALANCE W 744-1PRO

66 C79000-G8976-C185-03

Fragmentation

The Fragmentation Length Threshold parameter specifies the maximum package

size transferred on the radio link. Large packets are divided up into small packets

prior to transmission and then reassembled into the original size after they have

been received. This can be beneficial if the transmission quality is poor because

larger packets are more difficult to transmit. This does, however, result in a poorer

data throughput.

Repetitions

There are two situations in which packets are repeated. The hardware repetition is

performed by the WLAN chip itself when it tries to repeat an unacknowledged pa-

cket 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 with-

drawn and all other packets in the buffer are sent first. Following this, transmission

of the packet is attempted again. The number of such repetitions is specified with

the SW Retry number parameter.

Using Use SW Retry, the software repetition mechanism can be disabled.

Antennas

The Antenna Mode list box specifies the use of antennas. The Diversity setting

takes the best of the two antennas for the data transmission. For each WLAN inter-

face, both antennas must be connected. If only one antenna is connected, this

must be selected here. The second antenna socket must also have a 50 Ω termi-

nator fitted.

Scanning for Access Points

While the client is connected to an access point, it scans for other access points in

the background with which it connects when necessary. There are three modes for

scanning access points that can be selected in the Background scan mode list box.

If you set Disable, there is no scan for access points while the client is connected.

If you set Scan if Idle, there is a scan for access points when no data transfer takes

place for a certain time.

If you set Scan Always, access points are scanned continuously.

The Background scan interval parameter specifies the interval at which further ac-

cess points are scanned.

To optimize the scanning for further access points, you can specify channels for

the client on which other access points can be found. To allow this, the Back-

ground Scan Ch.Select check box must be set and the channels of the other ac-

cess point is entered in the Background Scan Channels text box. Enter the chan-

nels separated by blanks.

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Siemens CP 1515 Instruções de Operação Página 66