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Chapter 5—The Enclosure and Its Parts
The enclosure is the structural basis of a distribution matrix.
The look of the enclosures in a distribution matrix is depend-
ent on several factors. Those factors include control method,
signal type, and I/O configuration. This chapter describes the
typical physical features of an enclosure.
This chapter covers:
q
Front of an Enclosure
q
Rear of an Enclosure
q
I/O Boards
5.1
Front of an Enclosure
The front panel of the enclosure may be either a Blank Front
Panel or an X/Y Control Panel. A system with a Blank Front
Panel requires some type of external controlling device. This
section describes the features of an X/Y Control Panel. For
more information about operating a distribution matrix with
a Blank Front Panel, refer to section 4.4, “Using External
Controllers.”
An X/Y Control Panel is a faceplate containing keys that are
used for entering commands to the CPU (see figure 5.1). Al-
though an X/Y Control Panel is optional, we recommend that
at least one enclosure in the matrix have one for matrix verifi-
cation, redundant control, and troubleshooting. If desired, an
X/Y Control Panel can be temporarily used and then removed.
However, any time an X/Y Control Panel is connected, the
Control Panel Configuration Scan (CPCS) bit in the configu-
ration word needs to be changed and then the distribution
matrix must be restarted to configure the X/Y Control Panel.
The standard X/Y Control Panel has 24 keys – 16 for the in-
put and output signals, 4 for the level (matrix), and 1 each for
the Preset, Change, Cancel, and Take commands.
The 16x16 X/Y Control Panel has 40 keys – 32 for input and
output signals, 4 for the level (matrix), and 1 each for the Pre-
set, Change, Cancel, and Take commands.
Depending on the I/O configuration of a distribution matrix,
not all input and output keys will function. For example, if
the I/O configuration is 8x4, the output keys labeled 13-16
(see figure 5.1) will not function.