3Com 8800 manual Power Supply Module, Visual indicators, System Controller, LED State Description

10CHAPTER 2: SYSTEM DESCRIPTION

Power Supply Module	The front panel of the power supply module has three LEDs (Figure 5). Their
Visual indicators	descriptions, colors, and functions are shown in Table 2.
	Figure 5 Power Supply Module Front Panel

Table 2 LED State Description

Condition	AC OK (green)	DC OK (green)	Fault (Red)
All OK	Lighted	Lighted	Off
Thermal alarm	Lighted	Off	Off
(Ambient)
Thermal alarm (fan fail)	Lighted	Off	Lighted
Blown AC fuse in unit	Lighted	Off	Lighted
Low or no AC > 15mS	Off	Off	Off
(single unit)
AC not present in any	Off	Off	Off
power supply module
Over Voltage Latched	Lighted	Off	Lighted
shutdown
Any internal failure	Lighted	Off	Lighted

System Controller	The PoE Power Rack has a system controller at the front of the chassis. Refer to
	Figure 6.
	Figure 6 Front Panel of the Controller

To indicate operational and alarm status, a green LED (RUN) and red LED (ALM) are located on the front panel of the PoE system controller. When the system has an alarm, such as input failure, input over-voltage or under-voltage, output over-voltage or under-voltage, power supply failure, or power supply self-protection, the red (ALM) LED will light. Once the alarm status is cleared, the LED goes off.

The system controller of the PoE Power Rack has two major functions: