Sierra Video G.R.I.P. V3.1.0 - Manual (Page 64)

Sierra Video Systems
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Active levels of the router are indicated by a Layer number in the “Layer” column.
This is an example of a router mapped with 75x84 virtual I/Os with 8 levels of different
sizes of actual (physical) levels.
Enter the “virtual” size of your router in the ID 1 row as worked out on the mapping
spreadsheet.
Close the Router Table when done.