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Pretext
Selecting this field allows access to the parameters used to define pretext as used in
VCR management applications (refer to the VCR Management section of the user's guide
for a comprehensive description).
Pretext Subrack ID
Pretext Slot
Number
X, Y
Dynamic
Where text insertion modules that support dynamic cable equalization are utilized, this
Equalization
field represents the cable length between the video input device and the switcher. Valid
DYNAMIC EQUALISATION values are 1 – 8 representing units of one hundred meters of
RG-59/BU coaxial cable.
For different coaxial cable types, the signal losses may be considerably different to the
losses of RG-59/BU (e.g. RG-8 and RG-11 have considerably lower losses). Where
different coaxial cable types are used, the DYNAMIC EQUALISATION value should be
varied to optimize image quality.
Note: If a dynamic equalization value is stated for ONE camera, then ALL cameras must
have a dynamic equalization value other than (0). Dynamic equalization serves to
improve image quality by providing compensation for cable related transmission losses,
dynamic equalization does not guarantee a maximally flat response with any given cable
distance or type.
Rev. B
Video Inputs, Continued
This field defines the address of the subrack, which contains the
text insertion card (RD200, RD205, MX205, RD220) for pretext.
The valid range of subrack addresses is 1 – 799, a value of 0
indicates pretext is not used.
For VideoBlox Subrack, this ID represents the
'V'+communication port number to which VideoBlox MVT (Multi
Channel Video Titler) is connected. Valid range: 'V'+maximum
communication ports.
This field defines the physical slot number within the pretext
subrack where the text insertion card resides. The valid range of
slot numbers is 1 – 32.
For VideoBlox Subrack, this number represents the physical
input slot for the VideoBlox analog input channel in MVT. Valid
range: 1 to 4096.
For pretext slot numbers 1 to 16 – MVT address is 1.
For pretext slot numbers 17 to 32 – MVT address is 2.
These two fields define the horizontal (X) and vertical (Y) location
of the pretext. The valid positions are 1 –13. These X and Y
coordinates are also the dynamic text coordinates where this
feature is enabled for video output channels.
6-10
HMXMC001013
31-Mar-06
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