The M4K825CAN is an intelligent multichannel ARINC 825 (CAN bus) interface module for the multiprotocol Excalibur 4000 family of carrier boards. The module supports up to ten ARINC-825 channels. In receive mode, the module stores all or selected messages with status and Time Tag information appended to each message. In transmit mode, the module operates via a transmit Bandwidth Frame which allows scheduling of data transmissions and reduces the need for host computer intervention.