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Paragraph 169 DEFINITIONS OF TERMS IN THIS ANNEX

Changes not yet applied. Later legislation changes this provision in ways not yet written into the text below:

“Synchronous optical network” (SONET) (5) means a network providing a means to manage, multiplex and access various forms of digital traffic using a synchronous transmission format on fibre optics. The format is the North America version of “SDH” and also uses the Synchronous Transport Module (STM). However, it uses the Synchronous Transport Signal (STS) as the basic transport module with a first level rate of 51.81 Mbit/s. The SONET standards are being integrated into those of “SDH”.