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تشبيك ضوئي متزامن
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Jerarquia digital síncrona
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Synchrone Digitale Hierarchie
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Jerarquía digital síncrona
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Synchronous Digital Hierarchy
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Hiérarchie numérique synchrone
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Szinkron digitális hierarchia
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Synchronous Digital Hierarchy
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Synchronous Digital Hierarchy
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Synchrone digitale hiërarchie
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Synchronous digital hierarchy
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