# Recommendation G.703 (11/1988): Physical/electrical characteristics of hierarchical digital interfaces

> superseded recommendation/international standard from the International Telecommunication Union

**Wikidata**: [Q27051355](https://www.wikidata.org/wiki/Q27051355)  
**Source**: https://4ort.xyz/entity/recommendation-g-703-11-1988-physical-electrical-characteristics-of-hierarchical-digital-interfaces