T8403C Trusted®TMR Expansion Processor module

The T8403C TMR extension processor is a fault-tolerant design based on the TMR structural arrangement in a lock

step configuration. The basic structure of the TMR extension processor is expressed in simplified terms. The module

has three main fault containment areas (FCR A, B and C). The fcr contains the interface of the extension Bus and the

Inter-Module bus (IMB). The IMB is the interface between the primary and secondary buses and other TMR extension

processors in the chassis, the control logic, the communication transceiver and the power supply.
Communication between T8403C TMR processors is through the TMR expander interface module and triple expansion

bus. The extension bus is a triple point-to-point architecture. Each channel of the extension bus includes separate command

and response media. The extender bus interface provides a vote to ensure that cable failures are tolerated,

extending the rest of the processor in a full triple mode even if a cable failure occurs.