User Manual

2 The WIMAN Command Line Level
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1.2 Frequency Hopping Procedure
All WIMAN radio modems operate with the modern frequency
hopping procedure. With this procedure, the RF-channel is
changed in very short intervals (all 8 ms). A total of 80 non-
overlapping radio channels are available.
WIMAN takes advantage of these 80 channels, each with 1
MHz of bandwidth, by use of spread spectrum technology (fre-
quency hopping).
The WIMAN radio modem transmits information packages that
hop from one frequency to another, not staying longer than 8 ms
in a frequency range.
As data packets are transmitted and received, the ISP selects the
order of the channels, producing a truly secured line of data.
This remarkable feature yields the following important advan-
tages:
• High security against eavesdropping due to fast changes
of the channel,
• Resistance to jamming,
• Protection against other RF-systems in the same fre-
quency band,
• High performance with high efficiency,
• Possibility of parallel operation of WIMAN connections
by use of different frequency-hopping patterns.
1.3 WIMAN Network Topology
With the WIMAN technology, bonding can be structured in a
simple point-to-point connection, but it is also possible to set up
various other network topologies. The WIMAN product series
consists of three different wireless WIMAN radio-modems:
WIMAN STAR: wireless base station for public and private
point-to-multi-point networks.
WIMAN ACCESS: wireless access node for public and private
point-to-multi-point networks,
WIMAN LINE: wireless point-to-point connection between
two computers or computer networks.