Installation guide

FS4104-AW – Installation Guide
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Wireless LAN
Wireless LAN technology (WLAN, IEEE 802.11 standard) is used to realize an inexpensive and
scalable local area network that uses high-frequency radio waves rather than wires. Pratically, an
Ethernet card is replaced by a Wireless card, a RJ45 port is replaced by an antenna. ATOS
4
,
starting from 2.9 version, can be configured as an AP
5
, implements IEEE 802.11b (1999) and
IEEE 802.11g (2003) standards.
Both 802.11b and 802.11g standards use the DSSS
6
modulation, a transmission technology where
each bit is trasmitted as a redundant sequence of bits (called chip).
From 802.11, 802.11b and 802.11g standars inherit AP access and authentication methods and data
cryptography with WEP
7
.
Like traditional networks, the maximum number of contemporary customers a single AP can
support depends on amount and type of data to transfer.
FS4104-AW has two antennas to improve the radio communication quality, especially into
building and in presence of obstacles (Antenna diversity mode).
For WLAN configuration refer to ATOS guide (see § “Wireless LAN” and “DHCP” ).
Standard Frequency Modulation
Max
connection
coverage
Speed rate (Mbps)
# max contemporary
channels without
interference
802.11b 2.4GHz DSSS 100m 1, 2, 5.5, 11 3
802.11g 2.4GHz DSSS 100m
1, 2, 5.5, 11; 6, 9, 12, 18,
24, 36, 48, 54
3
4
In Aethra devices with wireless card.
5
Access Point.
6
Direct Sequence Spread Spectrum.
7
Wired Equivalent Privacy, protocol that uses the RC4 cypher algorithm for security and the CRC-32 for data integrity check.
BB
Network
AP
Wireless device
VDSL
WIRELESS