# Recommendation I.430 (11/1988): Basic user-network interface - Layer 1 specification

> superseded recommendation/international standard from the International Telecommunication Union

**Wikidata**: [Q26985442](https://www.wikidata.org/wiki/Q26985442)  
**Source**: https://4ort.xyz/entity/recommendation-i-430-11-1988-basic-user-network-interface-layer-1-specification