Broadband Integrated Services Digital Network (B-ISDN);Synchronous Digital Hierarchy (SDH) based user network access;Physical layer interfaces for B-ISDN applications (Endorsed by Asociación Española de Normalización in June of 2022.)
Broadband Integrated Services Digital Network (B-ISDN);Synchronous Digital Hierarchy (SDH) based user network access;Physical layer interfaces for B-ISDN applications (Endorsed by Asociación Española de Normalización in June of 2022.)
