GRASS VALLEY 1200, Installation And Service

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2-11
Cable Connections
External Reference Input to Frame J25/J26 and Panel J3/J4
Connect a reference source of analog color black video to frame connector
J25. Then connect a cable from frame connector J26 to panel connector J3 to
loop the reference to the panel. Loop the reference from panel connector J4
to another destination or terminate J4 with a 75-ohm precision termination.
The External Reference Input serves as the timing reference for all video
and key inputs to the switcher. The switcher senses the line rate (525 or 625)
and timing of the reference, and then sets the system for that line rate and
automatically times the inputs to match the reference.
Timing of the reference and the input timing window of the video inputs
can be adjusted together in the menus. This allows switcher output timing
to vary as needed to match other equipment in your system.
Digital Video and Key Inputs J1ÐJ16
Digital video/key inputs J1ÐJ16 conform to CCIR 601 4:2:2 component
digital video standards and may be either serial or parallel, depending on
which input options have been ordered.
Input signals may be either 525 or 625 lines but must match the line rate of
the External Reference Input in order to function. All inputs are autotimed
and do not require timing adjustment as long as they fall within a range of
±24 mircoseconds. Inputs can be mapped to crosspoint columns, manually
adjusted for timing, and set for 8 or 10 bits using the Configuration sub-
menus. Refer to instructions on setting up the control panel configuration
later in this section for details.