System Fault Leds; Diagnostic Leds - HP Carrier-grade cc2300 Product Manual

System Fault LEDs

There are four front panel system fault LEDs. The function of these system fault LEDs is described in the
following table.
Table 10-2 Front Panel System Fault LED Description
Fault LED
Critical This amber or red LED alarm is illuminated via SMBUS bus and may only be turned off
via SMBUS control. When continuously lit, it indicates the presence of a Critical System
Fault. A critical system fault is an error or event that is detected by the system with a
fatal impact to the system. In this case, the system cannot continue to operate. An
example could be the loss of a large-scale section of memory, or other corruption, that
renders the system inoperable. The front panel critical alarm relay will be engaged.
Major This amber or red major alarm is illuminated via SMBUS bus and may be turned off via
SMBUS control or alarm connector reset. When continuously lit, it indicates the presence
of a Major System Fault. A major system fault is an error or event that is detected by the
system that has discernable impact to system operation. In this case, the system can
continue to operate, but in a degraded fashion (reduced performance or loss of nonfatal
feature reduction). An example could be the loss of one or two mirrored disks. The front
panel major alarm relay will be engaged.
Minor This amber LED minor alarm is illuminated via SMBUS bus and may be turned off via
SMBUS control or alarm connector reset. When continuously lit, it indicates the presence
of a Minor System Fault. A minor system fault is an error or event that is detected by the
system but has little impact on actual system operation. An example would be a
correctable ECC error. The front panel minor alarm relay will be engaged.
Power The amber power alarm is illuminated via SMBUS bus or SYS_FLT_LED_L signal and
may only be turned off via SMBUS control. When continuously lit, it indicates the
presence of a Power System Fault. The front panel power alarm relay will be engaged.

Diagnostic LEDs

To help diagnose POST failures, a set of four bi-color diagnostic LEDs is located on the back edge of the
baseboard. Each of the four LEDs can have one of four states: off, green, red, or amber.
The LED diagnostics feature consists of a hardware decoder and four dual color LEDs. During POST, the
LEDs will display all normal Port-80 codes, representing the progress of the BIOS POST. Each POST code
will be represented by a combination of colors from the four LEDs. The LEDs are in pairs of green and red.
The post codes are broken into two nibbles, an upper and a lower nibble. Each bit in the upper nibble is
represented by a red LED and each bit in the lower nibble is represented by a green LED. If both bits are set
in the upper and lower nibble then both red and green LEDs are lit, resulting in an amber color. Likewise, if
both bits are clear then the red and green LEDs are off.
During the POST process, each light sequence represents a specific Port-80 POST code. If a system should
hang during POST, the diagnostic LEDs will present the last test executed before the hang. When reading
the lights, the LEDs should be observed from the back of the server. The most significant bit (MSB) is the
first LED on the left, and the least significant bit (LSB) is the last LED on the right.
NOTE When comparing a diagnostic LED color string from the baseboard to those listed in the
diagnostic LED decoder in the following tables, the LEDs on the baseboard should be
referenced when viewed by looking into the server from the back. Reading the LEDs from left
to right, the most significant bit (MSB) is located on the left.
80
Function
Chapter 8