T8310C

The expander processor belongs in one of the two leftmost processor positions of a T8300 Expander Chassis. It receives traffic from the T8311 expander interface through the approved adapter and cable path, then forwards addressed messages to the local Inter-Module Bus. It is not the main application processor and must not be installed in an ordinary I/O position.

Three primary fault-containment regions handle the triplicated communication paths, power supplies and control logic. Received traffic is resynchronized and voted before forwarding. A separate monitoring region supports non-critical display functions. Continued communication after one fault therefore does not mean that all physical paths remain healthy; error counters and slice status provide the necessary distinction.

Both active and standby units generate independent IMB power supplies, while the active processor provides synchronized IMB clocks and forwards system watchdog and power-fail signals. The chassis address and I/O connection-table entry remain part of the system configuration even though the module itself requires no local setup. A successful replacement must restore communication, diagnostics and the intended redundancy state.