# Recommendation X.22 (11/1988): Multiplex DTE/DCE interface for user classes 3-6

> recommendation/international standard from the International Telecommunication Union

**Wikidata**: [Q26985485](https://www.wikidata.org/wiki/Q26985485)  
**Source**: https://4ort.xyz/entity/recommendation-x-22-11-1988-multiplex-dte-dce-interface-for-user-classes-3-6