The ICS Triplex T8310 Trusted Expander Processor is a
fault-tolerant module built on a Triple Modular Redundancy (TMR)
architecture in a lock-step configuration. It is designed to extend
the Trusted system's capabilities while maintaining high
reliability, even in the presence of faults.
The processor contains three main fault containment regions (FCR A,
B, and C). Each region has interfaces to the Expander Bus and the
Inter-Module Bus (IMB), an active/standby link to the other TMR
Expander Processor in the chassis, along with control logic,
communication transceivers, and power supplies. These independent
regions help prevent single faults from affecting the rest of the
module.
The module communicates with the TMR Processor through the TMR
Expander Interface Module and the triplicated Expander Bus. Each
channel of the bus has separate command and response paths, and
voting at the Expander Bus Interface ensures the system can
tolerate cable faults. Even if a fault occurs, the rest of the
Expander Processor continues to operate in a fully triplicated
mode.
Communication with the I/O Modules in the Expander Chassis occurs
via the IMB on the backplane, which is identical to the one in the
Controller Chassis. This provides the same fault-tolerant,
high-bandwidth communication. All transactions on the IMB are
voted, containing faults locally if they happen. A fourth FCR (FCR
D) handles non-critical monitoring and display functions and
participates in the inter-FCR voting system. Isolation between FCRs
ensures that faults cannot spread from one region to another.
Technical Specifications
| Input Voltage | 24 VDC (Nominal) |
| Current Consumption | Typically 1.5 A |
| CPU Type | 32-bit microprocessor based |
| Operating Temperature | 0°C to +60°C (32°F to 140°F) |
| Storage Temperature | -40°C to +85°C (-40°F to +185°F) |
Mechanical Keying & Polarization
All Trusted Modules are mechanically keyed to prevent incorrect
insertion into a chassis, ensuring proper alignment and system
integrity. The polarization system is composed of two elements: the
module itself and the associated field cable.
Module Keying
Each module type is pre-keyed during manufacturing. This ensures
that only the correct module can mate with the designated chassis
slot, preventing misalignment or incorrect installation.
Cable Polarization
The system integrator is responsible for keying the field cable to
match the module. This is done by removing specific keying pieces
from the cable so they align with the bungs fitted on the
corresponding module. For installations requiring Companion Slot
configurations, both keying strips must be polarized to maintain
system compatibility.
T8310 Specific Instructions
For the T8310 module, remove keying pins 1, 2, and 5 on the cable
prior to installation. This ensures proper mating and prevents any
potential mis-insertion, maintaining the fault-tolerant design of
the Trusted system.
Ordering Process & Contact Information
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