# Recommendation M.20 (11/1988): Maintenance philosophy for telecommunications networks

> superseded recommendation/international standard from the International Telecommunication Union

**Wikidata**: [Q27051428](https://www.wikidata.org/wiki/Q27051428)  
**Source**: https://4ort.xyz/entity/recommendation-m-20-11-1988-maintenance-philosophy-for-telecommunications-networks