Sierra Video G.R.I.P. V3.1.0 - Manual (Page 61)

GRIP 3.1.0
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will be what the user uses to compose a “take”. Often the source name will be the same
as the corresponding physical input name that it will map to.
When building the mapping table, keep control panel requirements in mind. If you have
non-programmable single-bus or X-Y control panels that are smaller in size than the
number of sources (e.g. a 16-button single-bus panel on a router in which you are
assigning 128 sources), remember that the panels will only be able to access the first N
sources, where N is the number of panel source select buttons. So, in that case you
would want to assign the first N sources to those input connectors that are to be
switchable using those control panels!
Also keep source-destination restrictions in mind. If you need to be able to restrict certain
sources so that they cannot be routed to certain destinations, all such restrictions apply to
all levels of any given source-destination pair. If you restrict level 1, then all levels are
restricted. If multiple mapping is used, all sources that map to a given input must be
restricted in order to restrict that input.
Note that if a physical input connector is not assigned to at least one source number,
then that physical input connector is useless and cannot be switched. Therefore, always
make sure that every physical input connector on each level is assigned to at least one
source number.
Remember that a source number must be assigned to each group of signals that is to be
switched together as an all-levels take. It is always possible to switch any combination of
sources using a breakaway take, even if no source number was assigned to that
particular combination, but breakaway takes are more cumbersome to set up, so
frequently used combinations should be assigned a source number. In the example
below, source “AUDCON1” was created because it is desired to switch Audio Console 1
on the two audio levels without also switching “CAM1” on the video level, without having
to specify a breakaway take. This is called multiple mapping.
Since the mapping table permits any physical input connectors to take part in an all-levels
Take, you can see that in a sense, even an all-levels Take can be kind of like a
breakaway. A new definition of an all-levels Take might be appropriate: it is a Take
where the user specifies a single number or name of a single row in the mapping table.
Conversely, a breakaway Take is a Take where the user can specify a separate source
number or name for each level.
When you have finished assigning source numbers, you might have a table something
like this: