EXFO FTB-2 - Manual (Page 17)

Introducing the FTB-2 and FTB-2 Pro
FTB-2 and FTB-2 Pro 7
LED Indicators Description
(when unit is
connected to an
external power
source)
Green All batteries are fully charged.
Green, blinking At least one battery is charging.
Yellow, blinking At least one module would be using
more power than what is available
from batteries. Do not disconnect AC
power while this module is in use.
A blinking yellow LED takes
precedence over a blinking green one,
so when AC power is connected, even
if the LED is blinking yellow, batteries
are probably charging (depending on
conditions).
Red Battery error. Contact EXFO.
Red, blinking The detected temperature is too high.
This could lead to a thermal shutdown
of the unit if no action is taken to
reduce the temperature.
Off No battery present in the unit.
(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.
Red Battery error. Contact EXFO.
Red, blinking The detected temperature is too high.
This could lead to a thermal shutdown
of the unit if no action is taken to
reduce the temperature.
LED Status Meaning