ICS TRIPLEX T8461C

Description

ICS TRIPLEX T8461C
The primary function of the Expander is to provide a method of extending the IMB beyond a
single Processor Chassis. The active TMR Expander Interface Module receives messages
from the Processor Chassis IMB/Backplane and forwards them to the Expander Bus when its
slot position is enabled. Similarly, the active TMR Expander Processor Module forwards all
messages received from the Expander Bus to the Expander Chassis IMB.
Messages addressed to the Expander Processor Module itself, i.e. those command messages
with chassis and slot address fields matching those of the Module, result in the message
being handled locally and the appropriate response message being generated. For other
command messages the response message received by the active Expander Processor from
the addressed module is passed to the Expander Bus and hence to the TMR Expander
Interface Module. The active TMR Expander Interface Module then passes the message to
the Processor Chassis IMB, subject to the prevailing IMB control signals.
The messages received from the Controller Chassis IMB at the TMR Expander Interface
Module are re-synchronised and majority voted before being passed to the triplicated
Expander Bus. Similarly, messages received by the TMR Expander Processor Module from
the Expander Chassis IMB are re-synchronised and majority voted before onward
transmission.
Messages received from the Expander Bus at both the TMR Expander Interface Module and
TMR Expander Processor Module are re-synchronised and majority voted (Byzantine voted)
before being passed to the associated IMB.
Errors in messages are corrected, and therefore masked using this method. This, however,
makes it important that discrepancies in faults in these signals are detected and the
information made available for fault reporting purposes to avoid latent fault issues.

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