"FAST": blinking interval @ 2Hz
"SLOW HEARTBEAT": sinus-shaped interval @ 1Hz
1.3.1.2 LED Lighting Patterns
The table below indicates LED status light patterns for common SecureSync operating
statuses.
Table 1-1:
Common light patterns
Start-up ON OFF OFF OFF OFF OFF OFF
Software
upgrade/re-
boot
HEARTBEAT PATTERN INORDER,
BECOMINGSOLIDLEFTTORIGHTTOREPRESENTPROGRESS
1.3.1.3 Legend, individual LEDs
Table 1-2:
Legend for Status LEDs
Icon Light Meaning
OFF No power
ON Powered
OFF No GNSS reception (0 satellites)
HEARTBEAT GNSS acquisition in process (≥ 1satellite(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)
1.3 SecureSync Front Panel
CHAPTER 1 • SecureSync 2400 User Manual Rev. 2
5