Panasonic KX-TD500 System Reference Manual page 685

2.00 Display through LED Indicator
• SRC, DES indicators of LOOP key
Line conditions are displayed by three patterns of flashing LED indicators as follows.
Pattern 1
(240 wink)
Pattern 2
(60 wink)
Pattern 3
(120 wink)
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 with 120 winks/min and is called "120 wink".
Light on steady shows busy status and light off shows idle status.
• ALARM Indicator
ALARM indicator shows the following conditions.
Lit steadily : Indicates minor trouble.
Blinking : Indicates major trouble.
Not lit : Indicates the system is in normal
operation.
Pressing the ALARM key while ALARM indicator
lights or flashes displays the detail of the trouble
on the message line of the CRT screen and the
ALARM indicator light goes out.
Pressing the ALARM key again causes the
trouble message disappear.
1 sec
• NIGHT Indicator
Not lit indicates Day mode and lit indicates
Night mode.
• POWER Indicator
Not lit indicates POWER switch is turned OFF.
And lit indicates POWER switch is turned ON.
This POWER switch is used to turn on and off
the CRT display.
The attendant console is operable during power
failure, if it is connected to the main unit.
(For details, refer to Section 6-J-11.00 "Power
Failure Operation".)
6-A-5