Ensemble Designs 7465 Sync Changeover Switch - Manual (Page 5)

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Page 5
7465 Sync Changeover Switch and 9465 3G Sync Changeover Switch
Monitoring
Fault conditions can be monitored with an external alarm system or other device through the 15-pin
Control connector on the rear of the Avenue 7465 or Avenue 9465. Signal status from this connector
can be monitored by a device to show Primary and Secondary signal status and the current position
of the protect switch (Primary or Secondary). Two GPI Override Inputs are also available to allow
changing switch position from an external device. This can be used to manually reset the switch after
the Primary has recovered from a fault condition.
The on-board CPU can monitor and report module ID information (slot location, software version
and board revision) and power status to the optional frame System Control module. This information
can be accessed by the user or set to register an alarm if desired using the remote control options
available.
Importance of Proper Output Termination
The sync changeover switch is designed to be a hard contact device. An input is directly connected
to the output through a relay contact without buffering. Thus, a loss of proper termination of the
output will be seen by the 7465 or 9465 circuitry. Failure of the output termination will cause the 7465
or 9465 to sense the signal as having a fault due to the improper termination. If the module is set for
Auto Mode or Auto Reset, loss of proper termination will cause a flip-flopping of the sync changeover
switch.
While this is usually not a matter of concern in daily operation as the output is properly terminated,
it can produce unexpected results if the switch is installed and powered up without a properly
terminated cable.