Basic Operation and Features
Connector Name
Purpose
# of
connections
Connector
type
Alarm Input
Input for an external source alarm circuit
2
BNC
Signal Input
Input for the RF and digital signals
2
BNC
Signal Output
Output for the RF and digital signals
12
BNC
Ground
Chassis ground connection
1
Screw post
TwoAnalog/DigitalInputs
Inputs A and B are rear mounted 50Ω BNC connectors. They terminate the input signal in either 50Ω
or 1kΩ loads. These loads are selectable through the Command Line Interface.
TwelveAnalog/DigitalOutputs
Outputs 1 through 12 are rear mounted 50Ω BNC connectors. They are 50Ω fixed outputs.
These outputs distribute analog and digital signal outputs.
Auto-SwitchingCapability
When in Auto-switching mode, if an external or internal fault is detected, the unit will automatically
switch all outputs from the user selected Primary input to the Secondary input. The unit latches in the
Secondary state with alarms activated until the user clears the alarm condition via either the Front
Panel, or Command Line Interface. Input A or Input B may be selected as the Primary Input by acti-
vating the Auto button with the desired input selected.
The Front panel autoswitch LEDs indicates the state of the autoswitch. The three front panel LEDs,
Input A, AUTO, and Input B can be used to view the 9611B autoswitch status.
In general, both Input A and Input B need to have valid signals applied to them for the Autoswitch to
be activated. For example, if Input A is valid and Input B is not valid, if Input A then becomes faulty,
switching to Input B makes no sense.
The proper autoswitch condition is therefore to have two valid inputs. One of the inputs is designated
as the primary. The primary is switched to the twelve outputs. If the Input B is valid, then the auto-
switch can be activated, arming Input A. Arming means that both inputs are valid, and if the primary
signal fails, the secondary signal will be switched to the twelve outputs.
Armed LED condition
The 9611B can be seen to be armed when the Input A, AUTO and Input B front panel LED are green.
Also, the AUTO LED and one of the two input LEDs should be flashing slowly, and the input LED that
is not flashing, is solid green.
In this condition:
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The flashing green LED is the primary, connected to the twelve outputs.
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The solid green LED is the secondary that will be switched to the output if the primary input
fails.
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The flashing AUTO LED shows that the 9611B is armed and ready to switch if need be.
Page 12
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9611B_UserGuide_RevA.pdf
