Nortel Networks 6140 - Manual (Page 36)

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Basic handset operation
Displaying additional features
To display additional features During a call, press FCN to display
additional features that are customized for
your facility.
Turning on the backlight
To turn on the backlight The backlight illuminates when any key is
pressed or when there is an incoming call,
and stays on for 10 seconds. If another key is
not pressed within 10 seconds, the backlight
automatically turns off.