# Recommendation R.79 (11/1988): Automatic tests of transmission quality on telegraph circuits between switching centres

> recommendation/international standard from the International Telecommunication Union

**Wikidata**: [Q27051430](https://www.wikidata.org/wiki/Q27051430)  
**Source**: https://4ort.xyz/entity/recommendation-r-79-11-1988-automatic-tests-of-transmission-quality-on-telegraph-circuits-between-switching-centres