quaternary signaling

quaternary signaling

[′kwät·ən‚er·ē ′sig·nə·liŋ]
(communications)
An electrical communications mode in which information is passed by the presence and absence, or plus and minus variations of four discrete levels of one parameter of the signaling medium.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.