Panasonic KX-T336 System Reference Manual page 427

3.00 LED Indication Patterns
Line conditions are displayed by three patterns of flashing LED indicators on PITS buttons, as follows.
Pattern 1
(240 wink)
Pattern 2
(60 wink)
Pattern 3
(120 wink)
1 sec
Pattern 1 : Shows call arriving with 240 winks/min and is called "240 wink."
Pattern 2 : Shows holding a call with 60 winks/min and is called "60 wink."
Pattern 3 : Shows Unattended Conference and Privacy Release with 120 winks/min and is called "120
wink."
Light on steady shows busy status and light off shows idle status.
4-A-19