Differential TTL is a type of binary electrical signaling based on the transistor-transistor logic (TTL) concept. It enables electronic systems to be relatively immune to noise. RS-422 and RS-485 outputs can be implemented as differential TTL.
Applications
Differential TTL signaling was used in the Serial Storage Architecture (SSA) standard devised by IBM, but this is mostly obsolete. More efficient signaling techniques such as LVDS are now used instead. ==See also==