- SDH is European standard for synchronous transmission over a fiber optic network
- SDH stands for synchronous Digital Hierarchy
- Standardized multiplexing protocol that transfer multiple digital data over fiber optic channels
- SDH is the international version of the standard published by the International Telecommunications Union (ITU)
- Synchronous Transport Module (STM) is the base signal of synchronous Digital Hierarchy (SDH) protocol
- The base transmission rate of SDH protocol is 155.52Mbit/s and this transmission rate is designated as STM-1
SYNCHRONOUS DIGITAL HIERARCHY (SDH) - topic 2 telephony
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