# Recommendation X.2 (11/1988): International data transmission services and optional user facilities in public data networks and ISDNs

> superseded recommendation/international standard from the International Telecommunication Union

**Wikidata**: [Q26985478](https://www.wikidata.org/wiki/Q26985478)  
**Source**: https://4ort.xyz/entity/recommendation-x-2-11-1988-international-data-transmission-services-and-optional-user-facilities-in-public-data-networks-and-isdns