# Recommendation T.561 (11/1988): Terminal characteristics for mixed mode of operation MM

> recommendation/international standard from the International Telecommunication Union

**Wikidata**: [Q26928604](https://www.wikidata.org/wiki/Q26928604)  
**Source**: https://4ort.xyz/entity/recommendation-t-561-11-1988-terminal-characteristics-for-mixed-mode-of-operation-mm