User's Manual

Menus and Parameters
2-27
BreezeACCESS 4.0 System Manual
# Spanning Factor (AU only) – Defines the Spanning
Factor to be used by the Enhanced Scrambling
mechanism. The Spanning Factor should be chosen so
that the GCD (Greater Common Divisor) of the Spanning
Factor and the Number of Hopping Frequencies would
be 1 (e.g. for 8 frequencies possible values for the
Spanning Factor are 1, 3, 5 and 7). The SU learns the
value of the Spanning Factor from the AU during the
association process.
Use of different spanning factors by non-synchronized
neighboring base stations reduces the probability of
interference between adjascent sectors.
Valid values: 1 to Number of Hopping Frequencies minus
1, provided it meets the GCD requirement as described
above.
It is not recommended to use spanning factors of 1 and
N-1, as they result in hopping on consecutive channel
(assuming that the available channels are consecutive). In
these cases the advantage of using frequency hopping is
not fully utilized, since a narrow band interference may
affect several consecutive hops. Spanning factors of 2 and
N-2 also result in a relatively poor spread of the hopping
frequencies over the available frequency band.
Default Value: 1
" Show Flexible Hopping Parameters – Displays the
following information:
# An updated list of the defined sub-bands and discrete
frequencies to become effective after the next reset. A sub-
band is defined by the first and last hopping frequency in
a series of consecutive frequencies, with 3MHz separation
between frequencies.
# An updated list of all the hopping frequencies to be used
after the next reset.
# Scrambling Mode
# Manual Sequence Definition (if applicable)
# Spanning Factor (if applicable. In the SU it will be shown
only when operating in the Enhanced Scrambling mode)
# The current sequence of operational hopping frequencies
NOTE:
During the association process, the SU learns the Scrambling Mode
(and the Spanning Factor if applicable) of the AU. If the Scrambling
Mode of the AU is different from the one configured for the SU, than
after completing the association process the SU will use the
Scrambling Mode of the AU.