Synchronous Optical Network. An Interface standard for Synchronous 2.46-Gb/s optical-fiber transmission, applicable to the Physical Layer of the OSI Reference Model.

Note 1: SONET uses a basic Data rate of 51.840 Mb/s, called OC1 (optical carrier 1). The SONET Hierarchy is defined in multiples of OC1, up to and including OC48, for a maximum Data Rate of 2.48832 Gb/s. Note 2: SONET was developed by the Exchange Carriers Standards Association (ECSA).

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