Sonet Digital Hierarchy

Topics: Optical fiber, Light-emitting diode, Synchronous optical networking Pages: 1 (266 words) Published: March 4, 2013
* SONET Digital Hierarchy
* Synchronous Optical Networking (SONET) is a standardized multiplexing protocol that transfers multiple digital bit streams over optical fiber using lasers or light emitting diodes (LEDs). SONET was designed by the American National Standards Institute (ANSI) for the USA public telephone network in the mid 1980’’s due to the breakup of AT&T. With the breakup, numerous regional telephone companies were created and those companies encountered network problems working together as well as alone. SONET was created as the new standard for these companies to use for their fiber optic long distance cabling. SONET is similar to the T-1 transmission service because it is an optical transmission service and is able to deliver many data channels from different sources. SONET is different from T-1 technology as it uses fiber optic media as well as different framing techniques than a T-1 transmission service. SONET also provides a much higher transmission capacity than T-1. Some of the advantages provided by SONET are, fiber is very secure, fiber has very low bit error rates, fiber is immune to interference. Although SONET has the potential to offer large amounts of bandwidth to the end user, it is also very expensive. SONET services cost approximately 20% more than other digital services of the same bandwidth. *

* Derdavis3, . (2012). T(X) and Synchronous Optical Network (sonet) Digital Hierarchy Ntc/362. Retrieved from *

* Woodcock, R. (n.d.). Gaining an Understanding of SONET. Retrieved from
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