Tektronix Grass Valley 4000, Installation And Service

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3-17
Signal Processor Frame
Crosspoint Module (064800)
The Crosspoint Modules distribute the video input signals in serial digital mode
to all the buses in the system.
After going through the Input Modules, the video is sent to all Crosspoint
Modules, M/E 1, M/E 2, M/E 3 and DSK. The Crosspoint Modules have a series
of 16 input X 8 output crosspoint ICs which create an 80 X 16 output matrix form
each module. The outputs from the Crosspoint Matrix ten provide the different
buses for the system.
All of the Crosspoint Modules make use of the HOS processor to control the aux
buses. The M/E processors control their respective M/E and key buses. The
Program, Preset and DSK key buses are controlled by the Head of State (HOS)
processor.
The HOS processor is wired to the same connector location in all Crosspoint
Module slots. The M/E 1 processor is wired to the same connector location in slot
A5 as the M/E 2 and M/E 23 processors are wired to in slot A4 and B2 respectively.
In slot A3 that connector location is empty and there is a jumper on the connector
that tells the module in that slot to use the HOS processor for everything.
The function, inputs, outputs, and processor used for each Crosspoint Module are
outlined below:
DSK Crosspoint Module (Slot A3) (Buses 33–48)
Function of the module:
This module takes all of the video inputs to the switcher including the ones
generated by the switcher and distributes them as video and keys to the DSK
Program and Preset buses and Aux Buses 1 through 4.
Inputs:
■
Primary inputs 1 through 64 from the Input Modules
■
Reentries and internally generated signals from the Serial Reentry Modules
Outputs:
■
DSK Program video and key
■
DSK Preset video and key
■
DSK key 1 and key 2
■
Aux 1 through Aux 4 video and key
Processors Used:
■
Uses the Head of State (HOS) processor