# Recommendation X.150 (11/1988): Principles of maintenance testing for public data networks using Data Terminal Equipment (DTE) and Data Circuit-terminating Equipment (DCE) test loops

> recommendation/international standard from the International Telecommunication Union

**Wikidata**: [Q27051505](https://www.wikidata.org/wiki/Q27051505)  
**Source**: https://4ort.xyz/entity/recommendation-x-150-11-1988-principles-of-maintenance-testing-for-public-data-networks-using-data-terminal-equipment-dte-and-data-circuit-terminating-equipment-dce-test-loops