Tektronix Grass Valley 3000 - Manual (Page 18)

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Section 1 — System Overview
General Description
The Model 3000 is a multi-format digital switcher that can
manipulate a variety of composite digital and analog video and
key signals through the use of 10-bit digital processing. Video
inputs and outputs can be a combination of analog, digital bit
serial, and digital bit parallel, depending upon the configuration
of your installation and the optional input and output modules
installed.
The Model 3000-2 provides two mix/effects (M/E) systems, a
program/preset mixer with dual downstream keyers, and up to
32 video inputs and 32 key inputs selectable at one time from the
control panel.
The Model 3000-3 has all the features of the 3000-2 plus a third
M/E and up to 48 video inputs and 48 key inputs selectable at one
time.