Front Panel and Connector Pinout

The NI 656x front panel, shown below, has three SMB jack connectors and one 73-pin Digital Data & Control (DDC) 12x Infiniband connector. The SMB jack connectors are described in the SMB Jack Connector Names and Descriptions table. The DDC connector signals are described in the DDC Connector Names and Descriptions table.

Note  If you design a custom cabling solution with connector (779157-01) and cable (192744-01), the NI 656x pinout is reversed at the end connector. For example, the signal shown on pin 1 shown in the previous figure would map to pin 73 at the end connector.

SMB Jack Connector Names and Descriptions

Connector	Signal Name	Signal Type	Signal Description
CLK IN	Reference/Clock Input	Control	External reference clock used for the PLL or for the external Sample clock used for pattern generation and/or acquisition.
PFI 0	Programmable Function Interface (PFI) 0	Control	Input terminal to the NI 656x for external triggers or the output terminal from the NI 656x for events.
CLK OUT	Reference/Clock Output	Control	Terminal for the exported PLL Reference clock or the exported Sample clock.
DDC Connector Names and Descriptions
Pins	Signal Name	Signal Type	Signal Description
65	DDC CLK OUT LVDS	Control	Positive terminal for the LVDS exported Sample clock.
66	DDC CLK OUT LVDS*	Control	Complementary terminal for the LVDS exported Sample clock.
71	DDC CLK OUT LVPECL	Control	Positive terminal for the LVPECL exported Sample clock.
72	DDC CLK OUT LVPECL*	Control	Complementary terminal for the LVPECL exported Sample clock.
62	STROBE	Control	Positive external Sample clock source that can be used for dynamic acquisition.
63	STROBE*	Control	Complementary external Sample clock source that can be used for dynamic acquisition.
14, 17, 20, 23, 26, 29, 32, 35, 38, 41, 44, 47, 50, 53, 56, 59	DIO <0..15>	Data	Positive bidirectional digital I/O data channels 0 through 15.
15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48, 51, 54, 57, 60	DIO <0..15>*	Data	Complementary bidirectional digital I/O data channels 0 through 15.
2, 5, 8	PFI<1..3>	Control	Positive input terminals to the NI 656x for external triggers or output terminals from the NI 656x for events.
3, 6, 9	PFI<1..3>*	Control	Complementary input terminals to the NI 656x for external triggers or output terminals for the NI 656x for events. Note  Pin 9 is grounded when the PFI channel is configured for the single-ended terminal configuration.
1, 4, 7, 10, 13, 16, 19, 22, 25, 28, 31, 34, 37, 40, 43, 46, 49, 52, 55, 58	GND	Ground	Ground reference for signals.
11, 12, 68, 69	RESERVED	N/A	These terminals are reserved for future use. Do not connect to these pins.