Getting Started 11
Chapter 1
General Description
The RF Multiplexer (6 x 4:1) and the Expander (6 x 4:1) modules are VXIbus
C-Size register-based products which provide bidirectional switching for
user inputs and outputs. Switching consists of connecting one channel to
common in that bank. The RF Multiplexer can operate in a C-Size VXI
mainframe using a command module such as an E1406.
Up to two Expander modules can be controlled by a single RF Multiplexer
module, providing a total of eighteen (4:1) multiplexer banks. These
Expander modules can either be inserted into the C-Size mainframe next to
the RF Multiplexer, or can be located up to eight meters from the RF
Multiplexer using the remote expander cables. Locating the Expander
module close to the external device keeps connecting cable lengths to a
minimum, thereby reducing the possibility of cross-talk and insertion loss
of high frequency signals.
You may connect E1475A Expander or E1473A Expander to the E1472A or
E1474A Multiplexer. The drivers on both modules can support either of the
expander relay modules.
Basic Operation
The RF Multiplexer modules and Expander module consists of six banks of
channels (bank 0 through bank 5) to form six 4:1 multiplexers. The switching
sections of the RF Multiplexer and Expander modules are identical. See
Figure 1-1 for a simplified switching diagram. Banks are arranged as follows:
•
Bank 0 includes channels 00 through 03 and Com 00.
•
Bank 1 includes channels 10 through 13 and Com 10.
•
Bank 2 includes channels 20 through 23 and Com 20.
•
Bank 3 includes channels 30 through 33 and Com 30.
•
Bank 4 includes channels 40 through 43 and Com 40.
•
Bank 5 includes channels 50 through 53 and Com 50.
In the remainder of this manual, channels are referred to as n0 through n3
and Com n0, where n is the bank number (0 through 5). Each channel is
switched (connected to its common) by closing the appropriate (nonlatching)
relays. Channels n0 through n3 can be switched to Com n0 for all banks.
Only one channel in each bank can be connected to its common at a time.
User inputs/outputs to each channel are via SMB connectors. When a
channel is CLOSed, it is internally connected to the COMmon connector.
When a channel is open, it is internally disconnected. Open channels are not
terminated. At power-off, power-on, or reset, channel n0 is switched to the
COM n0 connector, and all other channels (n1 through n3) are open
(non-terminated) for all banks.
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