Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of HNS-fr#Sense
Synchronous digital hierarchy-en#Sense
Jerarquía digital síncrona-es#Sense
Synchrone Digitale Hierarchie-de#Sense
SDH-de#Sense
Gerarchia numerica sincrona-it#Sense
Hiérarchie numérique synchrone-fr#Sense
SDH-en#Sense