ABSTRACT
The Commercial Standard Digital Bus (CSDB) is one of several digital serial integration data buses that currently predominate in civilian aircraft. This chapter shows how CSDB may implement bidirectional transmissions between bus users. It examines various levels of integration considerations for CSDB, including physical, logical, software, and functional considerations. The logical integration of the hardware is controlled by the CSDB standard which establishes the bit patterns that initiate a message block and the start bit, data bits, parity bit, and stop bit pattern that comprises each byte of the message. Internal bus tests that the CSDB standard describes include a checksum test and a parity check. Both of these are used to ensure the integrity of the bus's data. The chapter lists some of the commercial transport aircraft and regional airliners using CSDB. CSDB is used both in retrofit installations and as the main integration bus.
