This section is an explanation of each part of MIL-STD-1553B on a paragraph-by-paragraph basis. The descriptions include (1) rationale for the requirements specified; (2) the requirements; and (3) identification of differences between MIL-STD-1553A and MIL-STD-1553B. The 1553B part that is discussed is presented first (indented as below), followed by the rationale, explanations, and differences from 1553A.