Sierra Video G.R.I.P. V3.1.0 - Manual (Page 55)

Sierra Video Systems
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Virtual Mapping
Introduction
Sierra Video Systems routers are shipped configured as “linear mapped”. That is, all
levels switch at the same time when an I/O is selected.
The term one-to-one mapping, or linear mapping, means that source 1 is assigned to
physical input connector 1, source 2 to connector 2, etc. This is the default mapping that
is shipped with each Sierra router. If one-to-one mapping is adequate, you do not need
to follow the instructions in this section for setting the mapping tables.
In non-mapped (linear mapped) Sierra routers, when a control panel or control program
calls for a connection, or “take”, from source 3 to destination 18, this means that the
signal going to the physical input connector labeled “3” is to be connected to the physical
output connector labeled “18”.
Sierra Video Systems routers offer the option of “Virtual Mapping”. In virtual-mapped
Sierra routers, a mapping table stands between the control panel “take” request, and the
physical connectors that are switched. Its purpose is to give the user more flexibility in the
way signals are connected to the router, and the way numbers are assigned to the
signals by the router.
There are two mapping tables, one for sources and one for destinations. Each mapping
table simply assigns a physical connector number to each source or destination number.
To help keep things straight, Sierra uses the following nomenclature when discussing
virtual mapping. The term source means a source number called for by a control panel or
control program doing a “take”. Likewise, the term destination means a destination
number called for by a control panel or control program doing a “take”.
The term input is reserved to mean a physical input connector on the router frame.
Likewise, the term output means a physical output connector on the router frame.
The source mapping table simply assigns, for each source number on each level, a
physical input connector number on that level. And likewise, the destination mapping
table assigns, for each destination number on each level, a physical output connector
number on that level.
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