The GX6616 consists of 6 switching groups, A through F, each providing switching of any two lines to any 16 other lines as shown in the figure below:
GX6616 Architecture
The built-in selftest (BIT) module provides a way to verify that the board relays are working properly. An optional BIT adapter that is connected externally to J6 and J7 is required to perform the BIT.
The GX6616 has 6 switching groups: A to F. There are two rows per group and 16 relays per row for a total of 192 relays. Each switching group can be connected to an adjacent group via jumper; either horizontally or vertically.
GX6616 Typical Switching Group
There are nine jumper header blocks that are used to connect adjacent switching groups. Four jumpers header blocks of 16 jumpers each are used for connecting 16 columns to their adjacent group. Five jumpers header blocks of 2 jumpers each are used for connecting 2 rows to their adjacent group.
GX6616 A, B and C Groups Jumpers
All the shielding on the GX6616 board is connected to a chassis signal. JP4 can be installed to connect the chassis and Ground.