Expansion
One Model 7711/7712 configuration is a dual (2 bank) 1 × 4 multiplexer. A single Model 7711/7712 module can also be
configured as a 4 × 4 blocking matrix. The 7711/7712 can be combined with additional modules to further expand its
multiplexing and matrix switching capabilities (specifications may degrade when the Model 7711/7712 is used in multiple
module configurations). Refer to
expansion follow
Table
1.
Table 1
Matrix and multiplex expansion
Number of 7711/7712 Cards
1
2
3
*Using four cards in a Model 2750, a 4 × 4 non-blocking matrix can be created (see the 4 × 4 non-blocking matrix example on page 9).
NOTE
The commands in this section are formatted as follows: Command (@Model 27xx Slot #,
Channel #)
Multiplexer examples
To minimize noise within the system, terminate unused channels with 50 Ω loads. If 50 Ω loads are
NOTE
not available, terminating unused connectors with a cable may also reduce noise within the
system.
shows how to create a 1 × 8 SP8T MUX (single-pole eight-throw multiplex) using two Model 7711 cards. Channels 1
Figure 2
and 2 are connected to OUT A and OUT B of the second card in slot two. Terminate unused channels (in the example, channels
3 and 4 on the Model 7712 in slot one) with a 50 Ω load.
shows how to create a 1 × 12 MUX using two Model 7711 cards.
Figure 3
Channels 3 and 4 (of 7711 in slot 1) may also be connected to other banks that will create a 1 × 12
NOTE
multiplexer (or a 1 × 16 multiplexer). See
sample commands needed to operate the 1 × 8 multiplexer.
NOTE
The command "ROUTe:MULTiple:CLOSe (@<channel list>)" closes one channel per bank (two
banks per Model 7711/7712 module), and opens all other channels within the same bank.
4
Table 1
for possible expansion information. Examples of multiplexer and blocking matrix
Multiplexer
1 × × × × 4
1 × × × × 8
1 × × × × 12
X
X
X
X
X
X
X
1 × × × × 16
4 × × × × 4
X
X
X
X*
for a 1 × 12 example. The following is a list of
Figure 4
Blocking Matrix
4 × × × × 8
4 × × × × 12
4 × × × × 16
X
X
X
X