Symmetricom 9611B, Руководство пользователя

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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.
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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.
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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:
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It is the primary input connected to the twelve outputs.
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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