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Description
T8151B Trusted Communications Interface
The Trusted® Communications Interface (CI) is an intelligent module that provides a range of
communication services for the Trusted Controller, minimising communication loading of the Triple
Modular Redundant (TMR) Processor.
A user-configurable module, the CI can support multiple communication media.
Up to four Communications Interfaces (CIs) can be supported by a Trusted System.
Features:
• Trusted Operating System.
• Dual Ethernet and four serial ports.
• Support for a wide range of communication protocols.
• Secure, dependable communications via high performance communications links.
• Modbus Slave.
• Optional Modbus Master (with T812X Trusted Processor Interface Adapter).
• Optional Sequence Of Events (SOE) Over Modbus.
• Front Panel serial diagnostic port, fault and status indicators.
T8151B
The module has a Motorola Power PC Processor. Bootstrap software is stored on Erasable
Programmable Read Only Memory (EPROM). Operational firmware is stored in flash
memory and may be upgraded via the Front Panel Port.
The Trusted Operating System is used on both the TMR Processor and CI. The real time
kernel is a high speed, high functionality kernel made for fault tolerant distributed systems.
The kernel provides basic services (such as memory management) and interference free
software environments.
A module watchdog monitors processor operation and the power supply unit (PSU) output
voltages.
The module is supplied with a dual redundant +24 Vdc power feed from the chassis
backplane. An on-board power supply unit provides voltage conversion, supply conditioning
and protection.
The Trusted CI communicates with the Trusted TMR Processor via the triplicated InterModule Bus. When polled by the Trusted TMR Processor, the module’s bus interface votes
the data 2 out of 3 (2oo3) from the Inter-Module Bus and transmits back its reply via all
three Inter-Module Bus channels. The remainder of the Communications Interface is
simplex.
All communications transceivers are electrically isolated from each other and the module
and have additional transient protection measures.
The module internal supplies are isolated from the dual 24 Vdc feeds.
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