NK823x Status LEDs

The front panel of the NK823x Ethernet port houses 9 labeled LEDs.

Each Ethernet connector includes 2 LEDs.

Front Panel LEDs
	Color	Description
Power	Green	Power (hardware controlled)
Vital function	Green	Software vitality: Blinking (1 flash): core software running.
Tamper	Red/Green	Tamper: Red: tamper alarm (hardware controlled). Green: tamper disabled (from management station).
Download	Red	Network diagnostics: OFF: Status OK. Blinking (3 flashes): FTP channel open (default IP addresses - see NK823x Internal Jumpers and DIP Switches). ON: Critical/hardware fault.
Diagnostics	Yellow	Internal diagnostics: OFF: Status OK. Blinking (fast): Booting operating system after restart. Blinking (1 flash): Missing or insufficient license. Blinking (2 flashes): Trouble with I²C bus to I/O modules; DF8000 configuration mismatch. Blinking (4 flashes): Trouble with the serial/network interface. Blinking (5 flashes): Trouble with application modules (some application modules can not start). ON: Critical/hardware fault.
COM 1	Red/Green	COM status: Red: RX. Green: TX.
COM 2
COM 3
COM 4

Ethernet Connector LEDs
LED Color	Description
Yellow	ON: a 100 Mbps link is active.
Green	Flashing: data is received or transmitted.