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E8491B/E1406A/E9851A: Differences between the SYSFAIL and FAIL LEDs on VXI Slot Controllers
SYSFAIL is usually tied to the backplane SYSFAIL line, and indicates the state of this backplane line. It will be asserted at power-on by all devices in the system and should go off when the devices pass their internal self-tests.

FAQ 2004-06-28