Video Board; Figure 2-6: Video Board - PictureTel Concorde 4500 Servicing Manual

Video Board

The Video board (VI) is located in slot 6 on the backplane. This board
provides an interface to the electronics module for video
equipment.The VI board is responsible for capturing motion and
still video.
The Video board has a Graphics daughter board which is
responsible for converting and Þltering graphics video.
See Appendix C for cabling information for this board.
The VI board supports the following functions:
Accepts analog video input from various video sources, such as
the PowerCam 100, document cameras, and a VCR.
Digitizes and stores analog video signals in an input buffer.
Accepts decompressed digital signals from the HAP board and
stores them in an output buffer.
Provides graphics overlay for on-screen messages that are
displayed on the near-end monitor.
Enables a preview of the near-end camera source while the far-
end image is displayed on the main monitor.
Provides three rear camera control interface ports for pan, tilt,
and zoom control cameras, such as the PowerCam 100.
Generates a digital color bar image and implements loopback
audio and video for diagnostic tests.
Provides video output for a VCR to record a videoconference
and accepts video input from a VCR for use in a
videoconference.
Video Board
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