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Difference between SONET and SDH

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  • Last Updated : 04 Dec, 2020

1. Synchronous Optical Network (SONET) :
SONET stands for Synchronous Optical Network. It is a communication protocol, developed by Bellcore which is used to transmit a large amount of data over relatively larger distances by using optical fiber. By SONET, multiple digital data streams are transferred at the same time over the optical fiber.

2. Synchronous Digital Hierarchy (SDH) :
SDH stands for Synchronous Digital Hierarchy and it defines as a multiplex technology used in the telecommunication. Synchronous Optical Network is internationally used. It is said to be a variant of SONET and is taken equal to SDH. It characteristics are founded on high order multiplexing. These technologies provide quite fast and low priced network interconnection than PDH which stands for Plesiochronous Digital Hierarchy.

Difference between SONET and SDH :

1.SONET stands for Synchronous Optical Network.SDH stands for Synchronous Digital Hierarchy.
2.It is a digital hierarchy interface for the optical transmission.It is a network node interface, user-network interface and U reference-point interface to assist BISDN.
3.It is developed by ANSI (American National Standards Institute).It is developed by ITU-T (International Telecommunication Union – Telecommunication Standardization Sector).
4.It has total number of transport overhead of 9×3 = 27 bytes.It has total number of transport overhead of 9×9 = 81 bytes.
5.It can transmit data in only synchronous mode.It can transmit in both synchronous mode and asynchronous mode.
6.It does not provides better transmission rates as compared to SDH.It provides better transmission rates as compared to SONET.

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