Synchronous optical networking

Rarity: Uncommon

A topic a little better known than average, read and translated beyond its own country.

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What Wikipedia says

Synchronous Optical Networking (SONET) and Synchronous Digital Hierarchy (SDH) are standardized protocols that transfer multiple digital bit streams synchronously over optical fiber using lasers or highly coherent light from light-emitting diodes (LEDs).

Excerpt from the Wikipedia article “Synchronous optical networking”, under the CC BY-SA 4.0 license. Read the article on Wikipedia