Applications
GARD 8000 SYS RFL Electronics
February 14, 2011 2-7 973.334.3100
2.3.2.1 CONTROL BUS
The controller uses the Control Bus to perform all configuration and setting of Optional and Functional
Modules. Status and diagnostics information is also transported over this bus.
2.3.2.2 LOGIC BUS
The Logic controller uses binary data transported on the logic bus. Optional modules (inputs and
outputs) and Functional modules receive and deliver binary data via this bus.
2.3.2.3 COMMS BUS
There are two internal comms buses, each with 12 x 64 kbps channel slots. All comms data to be sent
to the outside world resides on these buses and are delivered to a comms head and a Functional module
as configured.
2.3.2.4 REDUNDANCY
A Redundant mode of operation is available in the 6U-size chassis. When equipped with two
Controller Modules, a GARD system can disable a faulty Controller and transfer its functionality to the
standby module.
Regardless of whether one or two Controllers are present, only one of them controls midplane bus
traffic and is visible to the functional modules located in the GARD. Functional modules are not aware
of redundant operation in the system.
Information on the status of the redundant system is available through the system Web pages.
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