Configuring the RF Switch 9
Chapter 1
Chapter 1
Configuring the RF Switch
Using This Chapter
This chapter gives guidelines to use the Cascade RF Switch module
(RF Switch) including:
•
Switching Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
•
Creating Multiple Multiplexers. . . . . . . . . . . . . . . . . . . . . . . . . .12
•
RF Switch Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Switching Diagram
The E1470A Cascade RF Switch module consists of a series of twenty
3-to-1 multiplexers. Each 3-to-1 multiplexer can be programatically
cascaded with other 3-to-1 multiplexers to form larger multiplexers. For
example, combining two adjacent multiplexers (cascading) forms a 6-to-1
multiplexer, cascading three forms a 9-to-1 multiplexer, or cascading four
forms a 12-to-1 multiplexer, etc. Cascading all twenty 3-to-1 multiplexers
forms one 60-to-1 multiplexer.
Multiple combinations are simultaneously allowed on the module.
User connections to the module are to SMB connectors on the faceplate.
Figure 1-2 shows the switching diagram of the Cascade RF Switch module
with the switches shown in the power-on/reset state.
Since the relays on the switch are Form C, the relays are considered to
be
reset (
or
opened)
when the COMMON terminal is connected to the NC
terminal (the power-on/reset state). Relays are considered to be
set (
or
closed
) when the COMMON terminal is connected to the NO terminal.
See Figure 1-1.
Figure 1-1. Form C Relays States
COMMON
NO
NC
Power-On/Reset
or Open State
State
Set or Closed
Form C Relay
COMMON
NO
NC
Form C Relay
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