The figure below shows the GX6377 board connectors and jumpers followed by their description:
GX6377 Connectors and Jumpers
J6 – Front Connector: J6 (78 Pin D Type) front connector.
JP1- Guard Ground: Used to connect the relay ground layer to ground.
JP2 Jumper Header: A 32 pins jumper header that is used for connecting columns between groups A and B.
The figure below shows jumper header for groups A to B with JP2:
GX6377 Relay Jumper Configuration