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Matrix Switching Basics
The three-pole analog backplane of the mainframe is
shown in Figure 2-2. It is through this analog back-
plane where the rows of a Model 7012 matrix card in-
stalled in one slot can be connected to the rows (or
banks) of a compatible card installed in the other slot of
the mainframe.
Figure 2-3 shows how each row of the Model 7012 is
connected to the backplane. Notice that, since the Mod-
el 7012 is a two-pole card, there is no connection made
to the Guard terminal of the backplane. The Model
7012 is shipped from the factory with the backplane
row jumpers installed.
Figure 2-2
Model 7001 analog backplane
2-2
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Model 7001
Card 1
Analog
Backplane
Row 1 or Bank A
H
L
G
Row 2 or Bank B
H
L
G
Row 3 or Bank C
H
L
G
Row 4 or Bank D
H
L
G
H = High
L = Low
G = Guard
Removing (cutting) the backplane jumpers isolates the
card from the backplane, and subsequently, any card
installed in the other slot. For information on removing
the jumpers, refer to paragraph 3.3.1.
NOTE
The Model 7001 does not provide an
analog backplane for the non-701X se-
ries cards. As a result, anyone of these
cards installed in one slot in the main-
frame is electrically isolated from any
card installed in the other slot. The only
way to connect a Model 7012 to one of
these cards is to wire them together.
Card 2
H
L
G
H
L
G
H
L
G
H
L
G
Row = Matrix Card (7012)
Bank = Mux Card (7011)
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