Operation
2-21
2.6.3 Internal matrix expansion
Two to six Model 7174A cards can be connected together
within the mainframe to yield an 8
×
N matrix, where N
depends on the number of cards. Figure 2-15 shows an inter-
nally expanded matrix with three cards, resulting in an 8
×
36
(eight row by 36 column) matrix. As summarized in Table
2-3, the actual column number used when programming the
unit is determined by the slot.
WARNING
The shells of the row jumpers are at
guard potential. To avoid a possible
shock hazard, always disconnect all
cables from the row and column jacks
before removing or installing jumpers.
Because of critical signal paths, rows A-H are not jumpered
through the backplane. Instead, install the supplied coaxial
jumpers between appropriate connectors on Model 7174A
cards (for more critical signal paths, rows can be isolated
from other cards by not installing these cables). Each card
has two coaxial connectors for each row, allowing daisy
chaining of card rows. These connectors can be reached by
lifting the access door on the top of the mainframe; do not
remove cards to install the jumpers. This expansion is shown
schematically in Figure 2-15 for cards located in slots 1, 2
and 3.
Figure 2-16 shows the location of the connectors used for
this expansion. These connectors can be reached by lifting
the access door on the top of the Model 707A Switching
Matrix. The jumpers must be installed and removed before
installing or removing a Model 7174A from the 707A
Switching Matrix. Figure 2-17 shows how two cards can be
daisy chained together using the coaxial jumpers.
1 2 3 4 5 6 7 8 9 10 11 12
1
2
3
4
5
6
7
8
Paths
13 14 15 16 17 18 19 20 21 22 23 24
25 26 27 28 29 30 31 32 33 34 35 36
Internal
Paths Jumpers
Internal
Paths Jumpers
Slot 1
Slot 2
Slot 3
Figure 2-15
Connecting three cards for an 8
×
36 matrix
A
B
C
D
E
F
G
H
Measure
Warning: Guard potential is on
coaxial jumper shields.
(For each path)
Figure 2-16
Jumper connector locations
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Содержание 7174A
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