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Paragraph 168 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 digital hierarchy” (SDH) (5) means a digital hierarchy providing a means to manage, multiplex and access various forms of digital traffic using a synchronous transmission format on different types of media. The format is based on the Synchronous Transport Module (STM) which is defined by CCITT Recommendation G.703, G.707, G.708, G.709 and others yet to be published. The first level rate of “SDH” is 155.52 Mbit/s.