# Recommendation T.71 (11/1988): Link access protocol balanced (LAPB) extended for half-duplex physical level facility

> recommendation/international standard from the International Telecommunication Union

**Wikidata**: [Q26928848](https://www.wikidata.org/wiki/Q26928848)  
**Source**: https://4ort.xyz/entity/recommendation-t-71-11-1988-link-access-protocol-balanced-lapb-extended-for-half-duplex-physical-level-facility