Instruction manual

2-42
BreezeACCESS Version 4.5 Operations and Administration
Manual Revision: 1.0
! Scrambling Definitions - The Scrambling Definitions menu enables
defining the method of organizing the selected frequencies to form
the actual hopping sequence to be used. Proper organization of the
hopping sequence is essential to guarantee minimal cross
interference between several neighboring cells that use the same
sequence with different Hopping Sequence (Shift) values.
! Scrambling Mode - Defines the scrambling mode. The following
options are available:
! Standard Scrambling - This mode is not recommended for
sequences with 7 or more channels. The scrambled basic sequences
for 3 to 6 frequencies when using Standard Scrambling are as
follows:
Table 2-4: Basic Sequences using Standard Scrambling
Frequency 1 (index=1) is the lowest frequency in the list of frequencies
to be used, frequency 2 is the next frequency and so on.
! Manual Scrambling - For customized definition of the hopping
sequence, using the Manual Sequence Definition option (see below).
! Enhanced Scrambling - Automatically generates hopping
sequences using an enhanced algorithm. If the Enhanced
Scrambling Mode is selected, the Spanning Factor parameter (see
below) must be configured in the AU.
The Enhanced Mode is not suitable for sequences with 6 or less
frequencies. If Enhanced Scrambling is selected with sequences that
have 6 or less frequencies, than Standard Scrambling is used by
default.
For seven or more frequencies, the scrambled sequence is generated
according to the following rules:
N (number of channels) Scrambled Basic Sequence (channel indexes)
3 1, 3, 2
4 1, 3, 2, 4
5 1, 3, 5, 2, 4
6 1, 3, 5, 2, 6, 4