ABSTRACT
MIL-STD-1553 is a standard which defines the electrical and protocol characteristics for a data bus. MIL-STD-1553B defines the term TDM as "the transmission of information from several signal sources through one communications system with different signal samples staggered in time to form a composite pulse train". By sharing the use of the interconnect, the various subsystems could send data among themselves and to other systems and subsystems, one at a time, and in a defined sequence using a methodology called time-division multiplexing (TDM). The 1553 standard defines certain aspects regarding the design of the data bus system and the black boxes to which the data bus is connected. The standard defines four hardware elements: transmission media, remote terminals, bus controllers, and bus monitors. The remote terminal is the electronics necessary to transfer data between the data bus and the subsystem. The designer of terminal hardware or a multiplex system is forbidden to use the reserved mode codes for any purpose.
