Status LEDs

SecureSync's front panel status LEDs provide a real-time status overview: Seven (7) LEDs indicate the unit's current operating state.

Front panel LEDs

Blinking Intervals

The status LEDs can communicate four different operating states:

• "OFF"
• "ON"
• "FAST": blinking interval @ 2Hz
• "SLOW HEARTBEAT": sinus-shaped interval @ 1Hz

LED Lighting Patterns

The table below indicates LED status light patterns for common SecureSync operating statuses.

Common light patterns

Start-up	ON	OFF	OFF	OFF	OFF	OFF	OFF
Software upgrade/reboot	HEARTBEAT PATTERN IN ORDER, BECOMING SOLID LEFT TO RIGHT TO REPRESENT PROGRESS

Legend, individual LEDs

Legend for Status LEDs

Icon	Light	Meaning
	OFF	No power
	ON	Powered
	OFF	No GNSS reception (0 satellites)
	HEARTBEAT	GNSS acquisition in process (≥ 1 satellite(s), or 1PPS OK, or Time OK
	FAST	Antenna short circuit
	ON	GNSS is available as reference (1PPS and Time OK)
	OFF	No valid references
	FAST	Using non-primary reference
	ON	Using primary reference
	OFF	Unit is in Holdover (valid)
	ON	In Sync (valid)
	FAST	Not In Sync (Holdover period exceeded, or oscillator damaged)
	OFF	No output signal(s) detected/all outputs are disabled
	ON	At least one enabled output
	OFF	Both ETH0 and ETH1 invalid
	ON	At least one Ethernet connection valid
	OFF	Unit OK
	FAST	At least one active alarm, see Web UI

LED Patterns during Boot Sequence

For the first five seconds after power-up all LEDs will be OFF. Then the Power LED will be blinking before it will be lit permanently.

Responding to Alarms

If you are in front of your units, the fastest way to determine the origin of alarms is to press the button that is flashing; this will automatically bring up the menu of the category with a difficulty. See Front Panel Keypad, and Display for more information.