Siemens 2000 - Manual (Page 25)

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Roaming Threshold (Value range: 0-100 in %)
If, to improve the range, the WLAN includes several access points with the
same SSID and the same radio channel, the handset can switch between
the access points without interrupting the connection. I.e. if the handset is
too far from one access point it should establish a connection with the next
access point in the WLAN.
To do this, in the Roaming Threshold field specify a minimum value for the
reception strength of signals from the access point. If the reception
strength for the currently connected access point falls below this value, the
handset searches for another access point with better connection quality
and establishes a connection with this access point. The maximum signal
strength for an access point is limited to 100 mW (20 dBm).
Preamble Type
A preamble is placed in front of every data packet in a WLAN and is used by
the receiver to synchronise with the sender's cycle time. You can send a
short or long preamble. When the preamble is long the synchronisation is
less susceptible to error. When the preamble is short the data throughput is
greater. Not all WLAN devices support both types of preamble.
The WLAN standards IEEE 802.11 require that long preambles are
supported.
Saving/rejecting changes
Click on the Apply button if you wish to save the settings on this page in
the profile. Click on the Undo button if you want to reject the changes you
have made.
WLAN Security
Navigation: Admin > Network > Profile Selection > New / Edit > WLAN
Security
Most WLANs are protected against unauthorised access and against "eaves-
dropping". For this reason the handset has to provide authentication when
logging into the WLAN (at the access point). In addition, data exchanged
via radio connections is usually encrypted. You must store both the
encryption procedure and the key used on the handset so that it can
communicate with the access point and other WLAN subscribers.
Specify on this Web page the data the handset needs for accessing the
network (authentication) and for encrypted data exchange in the WLAN.
These parameters are usually defined in the access point (WLAN router).
Encryption protects data exchange within the WLAN, not data
exchange with Ethernet networks or with the Internet.