Synchronous digital hierarchy (SDH) is an international technology standard that utilizes light-emitting diodes (LED) or lasers for synchronous optical fiber communication.
During the early 1990s, SDH and synchronous optical networking (SONET) ignited an optical fiber industry movement. SDH/SONET were engineered for widely sourced circuit-mode communication transport--for example, digital signal 1 (DS1)—and encoded voice support via pulse-code modulation (PCM).
SDH/SONET specifications are described in Telcordia Technologies Generic Requirements GR-253-CORE, which is respected by many global standards organizations.
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