Legacy AXS API
Patch Bay
All API console patch bays provide extended access throughout the audio signal flow. In the standard
configuration 12 patch points are provided for every channel and options for additional points are
available. A comprehensive set of patch points that support buses, masters, monitors, and central
facilities is also provided. Each patch bay uses TT (tiny telephone) jacks and is 32 points wide. It fits in
a standard 19” rack space, but the rack must be heavy-duty.
Normals
In conventional professional patch bays, rows of outputs are located above rows of inputs. To facilitate
signal flow between the rows without the need for patching, the output rows are connected internally to
the input rows via contacts in the patch points. These connections are called “normalled” patch points
or simply “normals.” There are two types of “normals:” Half-normal and full-normal.
Half-normal: The connection between output and input is made within the patch bay and does not
require patching. Inserting a plug in the output does not break the connection to its normalled input.
Inserting a plug in the input or return patch point will break the connection from its normalled output.
The connected device input will receive the signal from the inserted plug. In other words: outputs “split”
the signal, Inputs “break” the normal.
Full-normal: Both patch points break the normalled connection between points when a plug is inserted.
Input AND output patch points “break.”
Most Legacy AXS patch bay normals are half-normals.
NOTE: The MIC TIE-LINE patch points are the only patch points that are fully-normalled (both points
will “break” the normal when a patch cord is inserted).
Patch Bay Overview
The patch bays for 32 thru 64-channel frames can be mounted onboard the console or remotely. The
patch bays for console frames larger than 64 channels must be mounted externally.
The patch bay has two sections that
support different sections of the console
and studio installation:
Channel Bay
System Bay
Patch bays are equipped with rear-
mounted multi-pin connectors to
provide multiple interfacing options.
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