The C&H Technologies VX481B is a ARINC-629 terminal module. The VX481B is a B-sized VXI Card. The C&H Technologies VX481B is a programmable ARINC-629 module that is capable of simulating up to 4 ARINC-629 Terminals. The unit has 256K dual bank memory for both transmit & receive, synchronized error insertion & user defined IRQ levels and vectors. It is a Register- based card.