ABSTRACT
European solution of reducing the channel
spacing to 8.33 kHz. VDL Mode 3 takes a 25 kHz
frequency assignment and divides it into 120 ms
frames with four 30 ms time slots (each of which
constitutes a different channel). Thus Mode 3
employs time division multiplexing (TDM)
rather than frequency division multiplexing
(FDM) used in the European system. Note that
VDL Mode 3 is the only planned VDL mode that
is designed to support voice and data traffic on
the same frequency.
