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SONET
Last modified: Thursday, July 28, 2005 

Short for Synchronous Optical Network, a standard for connecting fiber-optic transmission systems. SONET was proposed by Bellcore in the middle 1980s and is now an ANSI standard.

SONET defines interface standards at the physical layer of the OSI seven-layer model. The standard defines a hierarchy of interface rates that allow data streams at different rates to be multiplexed. SONET establishes Optical Carrier (OC) levels from 51.8 Mbps (OC-1) to 9.95 Gbps (OC-192). Prior rate standards used by different countries specified rates that were not compatible for multiplexing. With the implementation of SONET, communication carriers throughout the world can interconnect their existing digital carrier and fiber optic systems.

The international equivalent of SONET, standardized by the ITU, is called SDH.

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For internet.com pages about SONET . Also check out the following links!

Related Links

SDH/SONET Tutorial
A short tutorial on SDH and SONET from Queen's University of Belfast.

SONET presentation notes
This student page provides a good overview of SONET, including historical notes, terms, protocols, frames and how it works.

related categories

Fiber Optics

Networking Standards

related terms

ADM

broadband ISDN (B-ISDN)

fiber optics

OC

optoelectronics

SDH

T-1 carrier

T-3 carrier


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