Noun
sub-system (plural sub-systems)
A group of related components that are part of a larger system.
Science is a system of statements based on direct experience, and controlled by experimental verification. Verification in science is not, however, of single statements but of the entire system or a sub-system of such statements. Rudolf Carnap
By never revealing the decrypted program instructions, the cryptoprocessor prevents tampering of programs by technicians who may have legitimate access to the sub-system data bus. Source: Internet
A component within the last remaining working chain of X-band downlink sub-system failed on January 15, 2008. Source: Internet
The failure of the X-band communications sub-system hastened this, because the coldest part of the fuel pipework was routed over the X-band TWTAs which, when one of them was operating, kept this part of the pipework sufficiently warm. Source: Internet