MRV Communications MR2228-S2C manual Power Supply Receptacles, System Status LEDs

Table 1-2. System Status LEDs

LED	Condition	Status
PWR	On Green	The unit’s internal power supply is operating
		normally.
	On Amber	The unit’s internal power supply has failed.
	Off	The unit has no power connected.
Diag	On Green	The system diagnostic test has completed
		successfully.
	Flashing	The system diagnostic test is in progress.
	Green
	On Amber	The system diagnostic test has detected a fault.
RPU	Green	A redundant power unit is attached and is in backup
		or active mode.
	Amber	There is a fault in the redundant power unit.
	Off	There is no redundant power unit currently
		attached.
Stack	Flashing	An initial power-on state during which the stack
	Amber	configuration is detected.
	Green	This switch is acting as the Master unit in the stack.
	Amber	This switch is acting as a Slave unit in the stack.
	Flashing	When the user enters the light unit command in
	Green	the CLI, the unit ID of each switch in the stack will
		be displayed by the port LEDs 1 to 8.

Power Supply Receptacles

There are two power receptacles on the rear panel of the switch. The standard

5