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The Commercial Standard Digital Bus (CSDB) is a multidrop bus, formerly known as the Collins Standard Digital Bus. The maximum speed is 50 kbit/s.^{[citation needed]}

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Most civilian aircraft use one of 3 serial buses: the Commercial Standard Digital Bus (CSDB),[1] ARINC 429, or AS-15531.

The Commercial Standard Digital Bus is a two-wire asynchronous broadcast data transmission bus. Data is transmitted over an interconnecting cable by devices that comply with Electronic Industries Association (EIA) RS-422A. The physical layer is EIA-422.[2]

Messages on the CSDB consist of one address byte followed by any number of data bytes.[2]

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