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SDH
Last modified: Tuesday, May 29, 2001 

Short for Synchronous Digital Hierarchy, an international standard for synchronous data transmission over fiber optic cables. The North American equivalent of SDH is SONET.

SDH defines a standard rate of transmission at 155.52 Mbps, which is referred to as STS-3 at the electrical level and STM-1 for SDH. STM-1 is equivalent to SONET's Optical Carrier (OC) levels -3.

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

Related Links

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

Transmission systems and SDH
Contains links to four chapters that explain synchronous transmission, digital transmission systems, the origins and principles of SDH, and synchronous operation.

related categories

Fiber Optics

Network Protocols

related terms

fiber optics

OC

optoelectronics

SONET


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