# Recommendation U.22 (11/1988): Signals indicating delay in transmission on calls set up by means of synchronous systems with automatic error correction by repetition

> recommendation/international standard from the International Telecommunication Union

**Wikidata**: [Q27051474](https://www.wikidata.org/wiki/Q27051474)  
**Source**: https://4ort.xyz/entity/recommendation-u-22-11-1988-signals-indicating-delay-in-transmission-on-calls-set-up-by-means-of-synchronous-systems-with-automatic-error-correction-by-repetition