Comtech EF Data SDM-2020 - Manual (Page 43)

SDM-2020 Satellite Demodulator Revision 4
Installation MN/SDM2020D.IOM
3–3
3.1.1 Connector Pinout Definitions
Pinout “TYPE” is defined to described signal direction for each pin. The signal direction
is relative to the connector.
Definitions for Pinout Types
I (Input) A signal goes into the connector.
O (Output) A signal exits the connector.
I/O (Input/Output) A signal both enters and exits the connector on the specified pin.
GND (Ground) The pin is defined as being connected to a power supply ground or return.
N/A (Not Assigned) The pin is not assigned within the system but may be routed to other connectors.
Usually defines spare pins.
N/C (No Connect) The pin is not connected and is not used within the system.
N/U (Not Used) The pin is not used but is routed and has other uses within the system.
FC (Form C) The pin is connected to a “Form C” relay.