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Dual Node Module Service
3-10
9/95
3.3.6
3.3.6 EPNI Board
NOTE
The EPNI board is a later version of the PNI board.
The EPNI board is a controller board which interfaces the bus and processor in a similar
way as the controller boards listed in subsection 3.3.2. First, check the
SELF TST/ERR
light (red - should be out) and
PASS MOD TEST
light (green - should be on) on the EPNI
board.
The
SELF TST/ERR
light (red) is driven by a microprocessor on the EPNI board. If it is
on, check for the following causes:
•
There was a hardware failure on the EPNI board.
•
A problem was detected on-line (for instance, there may have been an EPNI local
RAM parity error or a duplicate address may have been detected).
•
The node was shut down (stunned) due to a watchdog timeout.
•
The number of raw errors detected exceeded a preset threshold, causing the
software on the EPNI board to enter the failed state.
If the state of the
SELF TST/ERR
light and
PASS MOD TEST
light are correct, continue with
this instruction. Under normal system operating conditions, the following indicators and
connections are present on the EPNI board:
•
Red LEDs
are out.
•
Green LED
is on.
•
The TX yellow LED
either blinks on and off (indicating traffic) or stays on (heavy
traffic).
Check that there are no disconnected or broken cables. If part of the UCN has failed, the
failure reporting and diagnostic tests included in the software will help isolate the problem.
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