Nortel Networks Passport 7420 - Manual (Page 15)

15
Display backlight
The display backlight automatically
turns on when there is an incoming
call, or if a key is pressed.
The backlight turns off after 10
seconds when the handset is idle.
You can disable the backlight to save
power, refer to the
“Customizing
handset” section in this guide for
more information.
Note: The backlight is disabled when
the key lock function is activated.