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The TMR Expander Processor is a fault tolerant design based on TMR architecture arranged in a lock-step configuration. Figure 1 shows, in simplified terms, the basic structure of the TMR Expander Processor.

The Module has three main fault containment regions (FCR A, B and C). Each of the main FCRs contains interfaces to the Expander Bus and Inter-Module Bus (IMB), an active/standby interface to the other TMR Expander Processor in the Chassis, control logic, communications transceivers and power supplies.

Features:

• Triple Modular Redundant (TMR), fault tolerant (3-2-0) operation.

• Hardware Implemented Fault Tolerant (HIFT) architecture.

• Dedicated hardware and software test regimes which provide very fast fault recognition and

response times.

• Automatic fault handling without nuisance alarming.

• Hot replacement.

• Front Panel indicators that show module health and status