Mvme167-34 Single Board Computer Card - Northern Telecom NAC Installation Manual

MVME167-34 single board computer card

The 32 Mbyte and 33 MHz MVME167-34 single board computer (SBC)
card is the central processing unit of the NAC system. It is based on the
MC68040 microprocessor.
Eight light-emitting diodes (LEDs) and two buttons are located on the front
of the MVME167-34 card. The types of LEDs and their locations for both
cards are shown in Figure 3-3.
The LEDs show the following conditions:
FAIL: This red LED lights when a hardware failure has occurred on
the CPU card. The LED also lights for a 7 to 10 minute duration when
the MVME167 card's on-board diagnostics is enabled during bootup.
STAT/STATUS: This yellow LED lights continuously, indicating a halt
condition from the card processor.
RUN: This green LED lights almost continuously but flickers when the
system processor has stopped.
SCON: This green LED lights continuously when the MVME167 card
is the VMEbus system controller.
LAN: This green LED lights continuously when the MVME167 card's
LAN microchip is the local bus master.
Note: As of the printing of this document, NAC 2 does not support
LAN.
+12V: This green LED lights continuously when the MVME167 card
is supplying +12V LAN power to the transceiver interface.
SCSI (Small Computer System Interface): Heavy communication
between devices is indicated by a solid light, while a flickering light
indicates less data movement.
VME: This green LED lights when the MVME167 card is accessing or
being accessed by the VMEbus.
Network Administration Center (NAC) Installation Guide Product release 2
Hardware installation 3-9