UNE-EN 301484-6V1.1.1

Integrated Services Digital Network (ISDN);Digital Subscriber Signalling System No. one (DSS1) protocol;Line Hunting (LH) supplementary service;Part 6: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma specification for the network (Endorsed by Asociación Espanola de Normalización in November of 2021.)