Meridian America Link/Customer Controlled Routing manual Meridian Link/CCR hardware

Chapter 4: Meridian Link/CCR hardware 63

There are eight light-emitting diodes (LEDs) and two switches on the faceplate of the SBC card, as illustrated in Figure 17.

The LEDs show the following conditions:

¥Fail indicator This red LED is continuously lit when a hardware or software failure occurs on the SBC. It is normal for this indicator to flash while diagnostics are being run (after power-on or during rebooting).

¥Status indicator This yellow LED is lit when the MC68040 Status signal goes low. When steadily lit, the LED indicates that the processor has stopped.

¥Run indicator This green LED is lit when the microprocessor executes a bus cycle. When applications are running, the LED is lit almost continuously but flickers every few seconds.

¥SCON indicator This green LED is always steadily lit to indicate that the SBC card is the VME bus system controller.

¥LAN indicator This green LED is lit when the LAN chip is the local bus master.

¥+12 V indicator This green LED is lit when power is available to the transceiver interface.

¥SCSI indicator This green LED is lit when the SCSI chip is the local bus master.

¥VME indicator This green LED is lit when the board is using the VME bus, or when the board is accessed by the VME bus.

The switches perform the following functions:

¥ABORT switch This switch, when pressed, stops program execution and returns control to the debugger. Do not press this switch. If you accidentally press it, all software operations will stop and you will be in the firmware debugger. In this case, press the red RESET switch immediately to reboot the system. Software diagnostics during system boot will attempt to repair possible file system damage caused by the nonstandard shutdown.

Meridian Link Release 5C/CCR Release 3C Installation and Upgrade Guide