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8.2. WiFi
WiFi interface is used for connection of users to access point. There are 2 WiFi
interfaces available, and each has two RSMA connectors for antenna. WiFi
interface complies with family of standards IEEE 802.11 type
a
,
b
,
g
and
n
2.4 GHz and 5 GHz.
Fig. 15 - Location of LEDs and connectors for WiFi
WiFi module allows connection with one antenna with SISO configuration, or
two antennas with multiplex 2
× 2 MIMO configuration.
8.2.1
Transmission speed
The theoretical speed is normally indicated by manufacturer, but in real life even
under optimal conditions only one-third of indicated speed can be expected.
Transmission speed depends on used 802.11 standard.
Configuration
Theoretical
transmission speed
Real
transmission speed
SISO
1 Mbps to 54 Mbps
0.3 Mbps to 18 Mbps
MIMO
300 Mbps
100 Mbps
Transmission can be secured by WEP, WPA, WPA2 or 802.1x technologies.
8.2.2
Connection of antennas
For good quality of signal transmitted between access point and counterpart
device it is necessary to maintain certain rules, also it greatly depends on type
of used antenna.
▪
If the antenna is directional
– it should be directed towards to the counterpart
device.
▪
Between antenna and counterpart device there should be as few obstacles
(especially metal obstacles) as possible.
▪
When using MIMO
– it is good to point antennas at a slight angle from each
other.