Instruction manual

2-110
BreezeACCESS Version 4.3 Operations and Administration
Manual Revision: 4.0
Hopping Parameters (GU)
The Hopping Parameters Menu allows configuration of the hopping
mechanism. The GPS modules deliver signals to the Access Units that
insure that their hopping patterns are fully synchronized. This includes
synchronizing the time each unit starts a new hop and ensuring that
units start the hopping sequence simultaneously.
 Number of Hopping Frequencies – Configures the Number of
Hopping Frequencies parameter to guarantee that all the Access
Units managed by the GPS module will start their hopping sequence
simultaneously.
To determine the correct number of hopping frequencies, access the
monitor program in one of the AU units, select Show Basic
Configuration in the Info Screens menu and view the Number of
Hopping Frequencies value displayed.
If the ISM hopping sequence is used (ISM US FCC or ISM
International), the number of hopping frequencies is 79.
 Dwell Time – Applicable only when the ACSE Option is disabled.
When the ACSE Option is enabled this parameter is not applicable
and the dwell time is the ACSE Dwell Time, set to a fixed value of
60 milliseconds (see page 2-85
).
 ACSE Option – see page 2-63
 GPS Antenna Recovery - Under normal operating conditions, the
BS-GU module uses the time signals it receives from the GPS
antenna to generate the synchronization signals for the AUs. When
two or more BS-GU modules are daisy-chained, the signals from the
GPS antenna are transferred to all "slave" BS-GU modules via the
SYNC OUT - SYNC IN cable, and all BS-GUs use these signals to
generate synchronization signals for their AUs.
The BS-GU can detect whether a daisy-chaining cable is connected
to its' SYNC IN port; If a daisy-chaining cable is connected to the
SYNC IN port, the unit is a "slave" unit. If a daisy-chaining cable is
not connected to the SYNC IN port, the unit will behave like a
"master".
The BS-GU continuously checks whether it receives proper PPS
(Pulse Per Second) signals from the GPS antenna. Proper PPS
signals are exactly one second apart. When a BS-GU detects that it
does not receive proper timing signals from the GPS antenna, it will
behave as follows:
a. If the BS-GU is a "master", it will start generating
synchronization signals using its internal clock. The
NOTE:
The values of the ACSE Option and Dwell Time (if the ACSE Option is disabled)
parameters must be the same for all GPS modules and Access Units in the system to
enable synchronized hopping.