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3.4
COMBINING, CONTINUED
Since monitor 1 selected video input 3, the video switching module in channel 1 of the
combiner subrack would select the video signal from input A and put it on its output.
A similar procedure takes place when a monitor from any other channel (of the combiner
subrack) selects a video input from any of the other two pre-selection subracks.
3.5
TEXT INSERTION
Post-text inserters are connected (in series) between each video output channel and it's
respective monitor. They are used to identify the currently selected camera, display
time/date, current operator name and other system information.
Text inserters can be located in any spare slot of virtually any video switching subrack.
They can be placed in the same subrack as the cascading video switching modules.
However, for the ease of system design and maintenance, special subracks are available
to house text inserter modules.
In a normal video system, each video output channel has a text inserter assigned to it.
In the system's configuration editor (the SETMAX program), each text inserter is
individually addressed. Therefore, a video output channel from subrack 10 can have its
text inserter in, for instance, subrack 2. They need not share the same subrack.
In small single video subrack systems, we recommend that all text inserters be placed in
the adjacent slot to its assigned video output channel module. In large multi-subrack
systems, the text inserter module should be located in a special text subrack at the same
slot position as it's assigned video output channel. This simplifies coax cabling and
maintains a logical flow through the schematic design of the whole video system.
The following two diagrams, figures 3.7 and 3.8, show proper placement of the text
inserter module in a system.
Rev. B
3-9
HMXMC001013
31-Mar-06
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