EXFO FTB-500 - Manual (Page 17)

Introducing the FTB-500
FTB-500 9
LED Indicators Description
(when unit is not
connected to an
external power
source)
Off The global level of the batteries is
above the “low-battery threshold”.
Yellow The global level of batteries is low.
Yellow, blinking The unit and its modules would be
using more power than what is
available from batteries. Connect AC
power as soon as possible.
Red Battery error. Contact EXFO.
Lit Hard disk read or write operations
Red, blinking Laser status LED.
At least one module emits an optical
signal.
Off No modules emit signal.
Varied

Each application using the alarm
LED provides its alarm level to the
platform when needed
(Red/Yellow/Green/OFF).

If more than one application uses
the alarm LED, the LED is displayed
using the color of the most severe
alarm with red as the most severe,
followed by yellow and finally
green.

If more than one application uses
the alarm LED, the LED is blinking.
LED Status Meaning