& Half Normal Connections
Normalling refers to a specific wiring pattern (within
a patchbay) that creates a path from one piece of
equipment to another without the use of a patchcord.
include vertical sets of jacks that are mounted in
a panel. In a normalled bay, each set of jacks have
an internal connection between them (the top jack
is connected to the bottom jack). Typically, the upper
jack represents a signal output while the lower jack
represents a signal input. With the patch bay left
as it is (no patch cord inserted) the signal will
flow from some output (top jack) to some input (bottom
jack) in its normal fashion. When a patchcord is inserted
to the top jack, it pushes one of the contacts aside,
breaks the connection to that normalled input, and
the output can be routed elsewhere. If a patchcord
is inserted into the bottom jack, that normalled connection
is broken and the patched signal (from a different
output) can be fed to that input.
a half normalled patchbay, inserting a patchcord into
the bottom jack breaks the normal but inserting one
in the top jack does not. Because of this, one output
can be connected to two inputs in a 'Y' type fashion.
It's not always acceptable to normal two plugs in a pair together. Many pieces of gear (outboard gear for example), do not have a signal normalled to their points simply because there is no place for them. Typically they would only be patched when needed. If this gear and cassette decks, for example, were were normalled, their inputs would be directly connected to their outputs when not patched elsewhere. This could damage equipment