Nortel Meridian Meridian 1 Maintenance Manual page 17

¥ MVME167-03 SBC card
The main CPU card of the Application Module. There are eight LEDs
and two switches on the faceplate of the SBC card:
Ñ The red LED (Fail indicator) is lit when the BRDFAIL bit is set or
when a watchdog time-out occurs. It is normal for this indicator to
flicker while diagnostics are running; when a failure occurs, this
indicator is steadily lit.
Ñ The yellow LED (Status indicator) is lit when the MC68040
STATUS pin is low (when steadily lit, it indicates that the processor
has stopped).
Ñ The green LED (Run indicator) is lit when the microprocessor
executes a bus cycle.
Ñ The green LED (SCON indicator) is lit to indicate that the SBC
card is the VME bus system controller.
Ñ The green LED (LAN indicator) is lit when the LAN chip is the
local bus master.
Ñ The green LED (+12V indicator) is lit when power is available to
the transceiver interface.
Ñ The green LED (SCSI indicator) is lit when the SCSI chip is the
local bus master.
Ñ The green LED (VME indicator) is lit when the board is using the
VME bus, or when the board is accessed by the VME bus.
Ñ The
ABORT
the debugger.
Ñ The
RESET
switch also generates a VME bus system reset.
¥ MVME333-2 X.25 Communication Controller (XCC) card
This card supports synchronous communications links to a host
computer and the Meridian 1. On the faceplate, there is a single red
LED (Fail indicator), which lights when a hardware or LAPB/X.25
communication software error occurs.
Meridian Link Release 5C/CCR Release 3C Diagnostic and Maintenance Guide
switch stops program execution and returns control to
switch, when enabled, generates a local reset. This
Chapter 1: Overview 5