The EXC-8000cPCI is an advanced Multi Protocol card (up to 6 modules) and together with the M8K1553Px(S) module gives you a MIL-STD-1553 test and simulation board for the Compact PCI bus.
The EXC-4000cPCI is an advanced Multi Protocol card (up to 4 modules) and together with the M4K1553Px(S) module gives you a MIL-STD-1553 test and simulation board for the Compact PCI bus.