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Matrix Switching
Basics
The
iihree-poie
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.
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
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.
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
to-
gether.
Card
1
Model 7001
Analog
I
Backplane
I"
H>j-
L>j-
G
)l-
Row
1
or
Bank
A
-j<
H
T<
L
kQ
H>!"
L
^
Row
2
or
Bank B
-j<
H
^L
G
^
-K
G
H X"
Row
3
or
Bank
C
-K
H
L
>|-
fC
L
G>j-
-|<C
G
Row4orBankD
L
,
L
V
"j<
L
"k
G
Card
2
I
H
=
High
Row
=
Matrix
Card
(7012)
L =
Low
Bank
=
Mux
Card
(701
1
G
= Guard
Figure
2-2
Model
7001
analog backplane
2-2
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