Siemens 2000 - Manual (Page 24)

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24
Transfer Mode
Specify whether data is to be transmitted within the WLAN in accordance
with Standard IEEE 802.11b (only 802.11b) or whether you wish data
transmission to be possible both in accordance with IEEE 802.11b and with
IEEE 802.11g (Mixed Mode).
The important difference between the two standards is the transmission
rate: in the case of IEEE 802.11g this is almost 5 times faster. If the units in
the WLAN use different standards, then you should leave the default
setting Mixed Mode.
If IEEE 802.11gst is set as the fixed value at the access point or WLAN router
for the Transfer Mode then you must set Mixed Mode here.
Transmission Rate
Specify the speed at which data is to be transmitted in the WLAN. The trans-
mission rate is measured in data units per unit of time (Mbit/s). The Trans-
mission Rate depends on the selected Transfer Mode. The possible
transmission rates for the set Transfer Mode are shown in the list.
You should leave the default set to Auto.
Fragmentation Threshold (Value range: 256-2346 in Bytes)
Specify the size at which voice packets are to be fragmented. Fragmen-
tation into smaller packets is used to improve the throughput of data in the
WLAN when the network is very busy.
Select a value between 256 and 2346 bytes. The default value of 2346
Bytes means no fragmentation.
RTS/CTS Threshold (Value range: 1-2347 in Bytes)
Specify the minimum packet size (in bytes) for which an RTS (Request To
Send) is to be sent. Smaller packets are transmitted straight to the access
point without an RTS.
The RTS/CTS threshold (Request to Send/Clear to Send) is used in WLANs
where there are many subscribers to avoid packets colliding (multiple
WLAN subscribers transmitting to the access point at the same time).
Before sending a data packet the handset sends an RTS to the access point.
The data is only sent if it receives a CTS from the access point. Other WLAN
subscribers can tell by the CTS that the access point is busy.
Specify a packet size between 1 and 2347 bytes. For the default value of
2347 bytes the RTS/CTS threshold is deactivated.
Activating the threshold can lead to a deterioration in the data
throughput!