Alvarion BreezeAccess II System Manual page 169

Menus and Parameters
Modulation (HDM) mode. The HDM mode enables flexible selection
of the frequencies and supports auto learning of the parameters in
the SUs.
NOTE:
HDM Mode is not certified for use by SU-R units.
Using Hopping Set and Hopping Sequence (Shift)
! Hopping Sequence (Shift) – When HDM is not used, it displays the
Hopping Sequence of the unit. A hopping sequence is a pre-defined
series of channels (frequencies) that are used in a specific,
pseudo-random order as defined in the sequence. The unit "hops"
from frequency to frequency according to the selected sequence.
When more than one AU is co-located in the same area, it is
recommended to assign different hopping sequences to each AU.
Hopping Sequences are grouped in three hopping sets (see Hopping
Set parameter below). When setting up multiple AUs in the same
site, always choose hopping sequences from the same Hopping Set
to reduce the possibility of collisions on the wireless media. This
parameter is only set in the AU. All the SUs learn it from the AU
during the association process.
The valid values depend on the applicable hopping standard (see
Table 2-3‚ page
The default value is 1.
! Hopping Set –Displays the selected hopping set. Each hopping
standard has 3 hopping sets. The Hopping Set selected in this
screen determines which hopping sequences are available in the
Hopping Sequence screen. Always use the same hopping set per site
(with different hopping sequences) to minimize the possibility of
collisions on the wireless media. This parameter is set only in the
AU. All the associated SUs learn its value from the AU during the
association process.
Valid values are from 1 to 3.
The default value is 1.
2-40).
BreezeACCESS Version 4.5 System Manual
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