Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field Subject Field/3226004
Is Reference of Plesiochronous digital hierarchy-en#Sense
Plesiokront digitalt hierarki-da#Sense
PDH-da#Sense
Jerarquía digital plesiócrona-es#Sense
JDP-es#Sense