# Integrated Services Digital Network

> set of communication standards for simultaneous digital transmission of voice, video, data, and other network services over the traditional circuits of the public switched telephone network, first defined in 1988

**Wikidata**: [Q170397](https://www.wikidata.org/wiki/Q170397)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/ISDN)  
**Source**: https://4ort.xyz/entity/integrated-services-digital-network


## References

1. BnF authorities
2. Nuovo soggettario
3. IdRef
4. Freebase Data Dumps. 2013
5. Integrated Authority File
6. Faceted Application of Subject Terminology
7. YSO-Wikidata mapping project
8. National Library of Israel
9. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)