Matrix Switching Basics
2-10
An obvious advantage of a partial matrix is that fewer
matrix cards are needed. Another reason to use a par-
tial matrix is to keep speciÞc devices from being con-
nected directly to other devices. For example, a source
connected to rows 5, 6, 7 or 8 (Figure 2-12) cannot be
connected to a column of Model 7012 #1 with one “ac-
cidental” crosspoint closure. Three speciÞc crosspoints
must be closed in order to route the source signal to a
column of card #1.
Figure 2-12
Partial matrix expansion (8
×
20)
1
2
3
4
Rows
1
Columns
7012 #1
10
7001 #1
External
Row
Jumpers
11
Columns
7012 #2
20
7001 #2
7012 #3
5
6
7
8
Rows
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