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Why are we required to fit Mode S whilst ADS-B is expected just around the corner?

April 26, 2017ads-b corner fit mode s

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Why are we required to fit Mode S whilst ADS-B is expected just around the corner?

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Although ADS-B can be used as a replacement for secondary surveillance radar in remote low traffic density airspace, such as that in much of Australia or Alaska, it is not expected that ADS-B will be used as a sole surveillance means in high density traffic areas like the core area of Europe. The Mode S transponder extended squitter is also an enabler for ADS-B operation.