The figure below shows the GX6256 board connectors and jumpers followed by their description:

GX6256 Connectors and Jumpers
J2 – Front Connector: Mac-Panel DAK connector (200 pin).
J3 – Front Connector: Mac-Panel DAK connector (200 pin).
J7 – Instrument Connector: Shrouded right angle IDC header (34 pin).
JP1 – Chassis Ground Jumper: Connects chassis to power ground
The figure below shows the GX6192 board connectors and jumpers followed by their description:

GX6192 Connectors and Jumpers
J2 – Front Connector: Mac-Panel DAK connector (200 pin).
J3 – Front Connector: Mac-Panel DAK connector (200 pin).
P1 – Analog Input Connector: BNC (8 pin).
P2 – Analog Input Connector: BNC (8 pin).
The figure below shows the GX6864 board connectors and jumpers followed by their description:

GX6864 Connectors and Jumpers
J2 – Front Connector: Mac-Panel DAK connector (32 pin).
J3 – Front Connector: Mac-Panel DAK connector (32 pin).
P1 – Input Connector: BNC (8 pin).