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DSx (Digital Signal-x)
Note: Many topics at this site are reduced versions of the text in "The Encyclopedia of Networking and Telecommunications." Search results will not be as extensive as a search of the book's CD-ROM.
Digital signal refers to the rate and format of digital telecommunication circuits. DS is related to the T designations; but DS refers to multiplexing techniques while the T designations refer to the underlying equipment and signaling. There are various DS levels, as outlined here:
DS-0 represents a single voice telephone call, while DS-1 defines how to multiplex 24 phone calls onto a single circuit. This DS signal hierarchy is part of the NADH (North American Digital Hierarchy). SONET (Synchronous Optical Network) is the extension of the NADH hierarchy into an optical hierarchy outlined by the OC (optical carrier) scheme. SDH (Synchronous Digital Hierarchy) is the European equivalent of SONET.
Copyright (c) 2001 Tom Sheldon and Big Sur Multimedia.