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3.1
THE MAXPRO-Net CROSSPOINT MATRIX VIDEO SWITCHING SYSTEM
The MAXPRO-Net is a crosspoint matrix video switching system; not just a video
switcher. It integrates all video equipment to provide a completely automated system
that can be operated from the MAXPRO-Net keyboards using simple key presses.
The following sections explain some concepts essential to the MAXPRO-Net system
design.
3.2
VIDEO MATRICES
A video matrix may be described as a selection table comprising of video inputs on one
axis, and video outputs on the other. The matrix "cross points" may be defined as the
available switching points between the video inputs and outputs. There are several
classifications of video matrix.
A "split" matrix consists of set groups of video inputs and outputs and has finite
limitations as to which inputs can be selected to which outputs. The groups do not
overlap.
A "conjoint" matrix is a split matrix where groups do overlap. That is specific video
outputs may select video inputs from more than one video input group.
A "full" matrix video switcher allows any input on the matrix to be selected to any output.
Most people believe that any full matrix video switcher will allow any video input to be
selected to any video output at any time, however, this is generally incorrect. Many "full
matrix" systems suffer from "trunking" limitations, which restrict the number of video
outputs that may be selected concurrently from any group of video inputs. These input
groups are a function of the hardware design of the switcher, and in many systems,
these limitations cannot be overcome. The inability to interconnect a matrix video input
to a matrix video output, because all possible paths between them are already in use is
called "blocking". Video switchers falling into this classification are referred to as
"closed" matrix video switchers.
An "open" matrix is a full cross point matrix, free from hardware limitations. An open
matrix allows any video input to be selected to any video output at any time, irrespective
of any other current selections. That is, an open matrix does not suffer from blocking.
There is, at all times, at least one available path between any input and any output,
regardless of the number of paths already in use.
In a "partitioned" matrix, software is configured to restrict the selection of video inputs to
selected video outputs. These restrictions are dynamic and may vary dependant on the
time of day, the day of the week the operator logged on, or the status of alarm inputs.
Rev. B
SECTION 3:
CONCEPTS
3-1
HMXMC001013
31-Mar-06
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