System Manual

Manual Sequence Definition
Manually defines the hopping sequence, using numbered channel indexes
(from 1 to “Number of Hopping Frequencies”). The sequence length must be
equal to “Number of Hopping Frequencies” (all the defined frequencies must
be used).
Erase Manual Sequence
Erases the manually defined hopping sequence.
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 adjacent 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 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
NOTE
It is always recommended to use a mid range or ½ N total channels used for the AU
Spanning Factor. For Example, If your AU Scrambling Definition is configured for a total
of 24 flexible hopping channels, choose a Spanning Factor of 12 or 13.