T8403CX TMR expansion processor module

The T8403CX Trusted@TMR expansion processor module resides in a Trusted processor slot in the

expansion chassis and provides the expansion bus and “slave” interface chassis baseboard between the expansion

machine. The T8403CX extension bus allows the use of an extension bus to achieve unmasked twisted

pair (UTP) connectivity of multiple chassis systems while maintaining fault tolerance, high bandwidth intermodule bus (IMB) capability.
The T8403CX module provides fault control for the extender bus, the module itself, and the extender

ensuring that the impact of these potential failures is local and system availability is maximized. This module

has the fault tolerance of hft TMR architecture. Comprehensive diagnostics, monitoring and testing provide

rapid fault identification. Hot spare and module standby support configurations to allow automatic and manual repair policies
Features:
· Three-mode redundancy (TMR), fault-tolerant (3-2-0) operation. · Hardware implements fault-tolerant (hft) architecture.
· Dedicated hardware and software testing mechanism, providing very fast fault identification and response time.
· Automatic fault handling, no nuisance alarm. Hot replacement.
· The front panel displays module health and status indicators

TMR extension processor is a fault-tolerant design based on TMR structure arrangement in lock-step

configuration. The basic structure of the TMR extension processor is expressed in simplified terms. The Module has

three main fault containment areas (FCRA, B, and C). The fcr contains the extension Bus and the intermodule bus (IMB) interface. 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 the module and the TMR processor 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 expander bus interface provides

voting to ensure that cable failures are tolerated, the rest of the expansion processor is in a full triple mode, and

even in the event of a cable failure, communication between the module and the I/O module in the expander case is via the

IMB on the expander backplane. Imbs provide the same fault-tolerant,

high-bandwidth communication interface modules and TMR processors as the control chassis. As with the extension

bus interface, all transactions are voted, and if an error occurs, the error is located to the IMB.
The fourth FCR(FCR D) provides non-critical monitoring and display functions as part of the Byzantine voting

structure within the fcr. Provide isolation between FCRS that require interfaces to ensure that failures cannot propagate between them.