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Synchronous digital hierarchy

standardized protocol that transfers multiple digital bit streams synchronously over optical fiber

Pronunciation
/ˈsɪŋkrənəs ˈdɪʤɪdl ˈhaɪəˌrɑrki/
/ˈsɪŋkrənəs ˈdɪʤɪtəl ˈhʌɪərɑːki/