Hardware manual

Preparing the test 2
Nov 98
narrowband interferer. If interference occurs on one frequency, then the data is simply retransmitted on a
subsequent hop. Noise on any given frequency will typically be absent after hopping to another frequency.
All FHSS products on the market allow users to deploy more than one channel in the same area. They
accomplish this by implementing separate channels on different, orthogonal, hopping sequences. Because there
are a large number of possible sequences in the 2.4 GHz band, FHSS allows many non-overlapping channels
to be deployed. If a particular part of the wireless network has more users or requires additional
bandwidth, a second Access Point can be added. Users roaming into the area will be randomly assigned to one
of the two Access Points, effectively doubling the available bandwidth in that area. This is not possible with
DSSS.
The power amplifiers for FHSS transmitters are more efficient than their DSSS counterparts. This enables
significantly lower power consumption in the FHSS products, resulting in lighter batteries and less frequent
recharges. For mobile applications, low power consumption is critical since users require long battery life to
stay mobile
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Preparing the test
Recommended test equipment and setup
Testing wireless LAN products doesn’t involve any special equipment or software. The following diagram and
table shows the recommended equipment and setup for performing the tests outlined in this document (Note
that more than one client may be needed to perform some of the tests.)
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Refer to Proxim’s whitepaper “Selecting a Wireless LAN Technology” for further information