User Manual

2 The WIMAN Command Line Level
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1.1 Transmission Speeds / Frequency Range
At present, wireless data network technology can be divided into
two categories: The first category consists of wireless modems
with a small transmission bandwidth. These products are used
for company networks, cellular networks, CDPD (Cellular Digi-
tal Packed Data) or GSM (Global System for Mobile communi-
cation) networks. The second category consists of wireless mo-
dems with large bandwidth in the ISM range (Industrial Scien-
tific Media, frequency range around 2,4 GHz), such as wireless
LAN products.
It is possible to cover a large area with the narrow band systems.
Some systems are even able to cover a complete country. The
other LAN products specified above operate with substantially
higher data transmission rates; however, the range of these sys-
tems is limited to approx. 300m/900ft. Therefore, the area of ap-
plication is strongly reduced.
The WIMAN technology offers the advantages of both the nar-
row band systems and the broadband systems. With a clear line
of sight between the antennas, data can be transmitted between
two WIMAN radio modems with a rate of up to 2048 KBit/s (at
the data interface) / 512KBit/sec at the wireless interface in du-
plex operation over a distance of up to approx. 40km/25miles
(FCC version) or up to approx. 5km/3.2miles (ETSI version).
Furthermore, WIMAN systems are deployed in a highly scalable
manner similar in nature to a cellular structure. Therefore, it can
overcome some of the need for direct line-of-sight.