Synchronous Optical Networking (SONET) SFP or Synchronous Digital Hierarchy (SDH) SFP is a kind of transceiver based on the SONET/SDH standard. SONET is the physical standard for fiber optical transmission, first brought out by Bellcore in 1980s and then standardized by American National Standards Institute (ANSI) for the popularization in the whole world. In the SONET standard, it mainly stipulates the transmission rate, fiber interface, operation and maintenance in optical fiber transmission. With the help of SONET, the communication device around the world can connect with each other, which greatly improved the efficiency of fiber communication.
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