User's Manual

XENTISSIMO
PRODUCT MANUAL
When several access points are installed, XENTISSIMO roams between them to
connect, in any condition, to the most trusted one.
XENTISSIMO will adapt to the security installed on the access point. For example
WEP, WPA, WPA2, etcetera.
WiFi is more complex than Bluetooth point-to-point communication. It requires
the same level of network management as any comparable wired network. Yet, it
offers more flexibility, is more widespread and has a better coverage. WiFi access
points always support multi-sessions, which means that they can transmit parallel
data and that a virtually unlimited number of devices can communicate wireless
to the access point.
The XENTISSIMO wireless LAN interface has the following main specifications:
• According to IEEE 802.11b standard;
• Low-power, small form-factor, integrated solution;
• Communication speed of up to 11 Mbps through the air. The net data rate is
lower due to protocol overhead, it’s a few Mbps;
• Fast interface for development purposes and software download;
• Two antennas, integrated in the terminal to achieve an optimal range of about
100 m using antenna diversity. This means that the access point will switch
reception to the antenna receiving the stronger signal.
Tip: Beware that this range will be reduced when the access point is
positioned next to a PC screen (strong magnetic field), when
microwaves disturb the signal, when the signal has to pass through a
reinforced concrete ceiling (metal bars), etcetera.
GSM/GPRS
Even greater mobility is achieved by mounting (in production final assembly) a
GSM/GPRS module onto the XENTISSIMO main board. Thus you have a terminal
with combined wLAN and GSM/GPRS capabilities.
Tips:
− The GSM/GPRS module is not replaceable by a technician;
− The GSM module does not support voice.
For a GSM transaction, a wireless connection is set-up with the host to send the
data back and forth.
22 - WIRELESS COMMUNICATION