Basic Operation and Features
Basic Operation
The 9611B is a switched distribution unit designed to distribute RF Sine wave or either AM or digitally
modulated time codes from either one of two inputs to all twelve outputs. A typical application of the
9611B would be where a primary signal is being distributed with a secondary signal connected as a
backup in case of failure with the primary source.
The 9611B has two user interfaces: See "Front Panel Controls and Indicators " on page 21, and See
"Command Line Interface" on page 23
ModeofSwitching
The 9611B provides for both manual and auto switching.
l Manual: In manual switching mode, selecting Input A or Input B will connect that input directly
to the twelve outputs. Input A or Input B can be selected manually by pressing the cor-
responding front panel input button, or by sending the appropriate command on the serial port
command line interface.
l Auto:To use auto-switching mode successfully, it is first necessary to set up the conditions of
comparison. The conditions of comparison are set up over the command line interface. The
9611B allows for a voltage level, and a signal time duration comparison to be made with the
selected input signal. Once the conditions of comparison are set up, the selected input can be
"Armed". This can be done manually by pressing "Auto" button on the front panel, or by send-
ing the appropriate command over the command line interface. The command is that either
input signal A or signal B is to be armed.
Arming an input means that:
l It is the primary input connected to the twelve outputs.
l It is the input being monitored in auto-switching mode, and being compared to conditions of
comparison previously set up. If the armed input fails the comparison conditions, the auto-
switching logic switches from the Primary to the Secondary source.The alarm condition will
be indicated by both the front panel and command line interfaces.
9611B_UserGuide_RevA.pdf.......................................................................... Page 7
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