Black Box Understanding PoE Injector LED Indicators and Troubleshooting Blinking Lights

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4. Description of LED Functions
		Table 1. LEDs and their functions.
LED	State	Function	Description
ON, CONNECT,	All three LEDS light	Power up	Upon power-up, all three LEDs will light for two seconds, as
FAULT LEDs			part of the self-test for the internal microprocessor software.
ON LED	Lights green after	DC output	After two seconds, the ON LED will light green, indicating that
	two seconds	voltage available	the DC output voltage is available for powering an 802.3af
			PoE compliant load.
CONNECT	Lights green	802.3af load	This green LED lights when a compliant load is attached to
LED		is attached	the output RJ-45 connector.
	Blinking	802.3af load	If the load does not comply with 802.3af PoE standards,
		is not attached	then the LEDs will blink a code indicating that the load was not
			detected. See Table 2 for code descriptions.

FAULT LED	Lights red	Overload or
		short circuit
	Lights red for	Power supply is
	two seconds,	trying to re-detect
	then goes off	a valid load

If a fault, such as an overload or short circuit, occurs, then the red FAULT LED lights. See Table 2 for code descriptions.

The red LED will light for two seconds and then go off as the power supply tries to re-detect a valid load. If a compliant

802.3af PoE load is NOT detected, the LED will indicate the problem as described in Table 2.

	Table 2. Failure detection codes.
Code	Name	Description
1	Incorrect resistive signature	The green CONNECT and red FAULT LEDs blink three times.
2	Incorrect capacitive signature	The green ON LED blinks three times.
3	Incorrect V offset	The green CONNECT and green ON LEDs blink three times.
4	Unstable current measurement	The green ON LED blinks three times.
5	Low voltage sensed during detection (overload)	The red FAULT LED blinks three times.

NOTE: After the LEDs blink three times, the power injector will continue to try to detect a valid load. Until the correct load is applied, the LEDs will continue to blink. If an open circuit is connected to the output RJ-45 connector, then the LEDs will not blink but the power injector will continue to try to detect a valid load.

LPJ001A-F, version 2

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