Multiplexing Basics
2-8
2.4
Multiplexer expansion
With the use of additional switching cards and mainframes,
larger systems can be configured. Each Model 7001 Switch
System mainframe will accommodate up to two cards, and
the Model 7002 Switch System mainframe can accommo-
date up to 10 cards.
2.4.1 Multi-card switching systems
Separate switching systems
Multiple single-card systems can be configured by removing
the backplane jumpers from each additional card. All cards
will be controlled by the same mainframe, but they will be
electrically isolated from each other. Figure 2-10 shows an
example using two Model 7015 multiplexer cards.
Multiplexer input expansion
You can double the number of multiplexer inputs by simply
installing two “as shipped” Model 7015s in the Model 7001
mainframe. Similarly, the number of multiplexer inputs can
be increased by a factor of 10 by installing 10, “as shipped”
Model 7015s in a Model 7002. By leaving the backplane
jumpers installed, the banks of the multiplexer card installed
in slot 1 (CARD 1) are automatically connected to the banks
of the multiplexer card installed in slot 2 (CARD 2) through
the analog backplane (and with any remaining cards installed
in a Model 7002).
Figure 2-11 shows an example of input expansion. Each
Model 7015 card is configured as four 1
×
10 multiplexers.
By connecting the banks together (via Model 7001/7002 an-
alog backplane), the resulting multiplexer system has 20 2-
pole inputs for each of the four banks. Note that, if all the
bank-to-bank jumpers on any card are installed (as shipped),
the result would be a single 1
×
80 multiplexer. A total of 10
Model 7015 cards installed in a Model 7002 would yield a
single 1
×
400 multiplexer with all bank-to-bank jumpers in-
stalled.
NOTE
Connecting any two banks on one card to-
gether also connects the corresponding
banks of the backplane together. Thus, the
corresponding banks of other card(s) will
be connected together even if the bank-to-
bank jumpers on those cards are not in-
stalled.
Figure 2-10
Two separate multiplexer systems
1
10
Bank B
Bank C
Bank D
Bank A
7015
1
10
1
10
1
10
7001/7002
Analog
Backplane
Card 1
Four 1x10 Multiplexers
7015
1
10
1
10
1
10
1
10
Card 2
Backplane
Jumpers
Removed
Four 1x10 Multiplexers
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