U.20 : Telex and gentex signalling on radio channels (synchronous 7-unit systems affording error correction by automatic repetition)

U.20 : Telex and gentex signalling on radio channels (synchronous 7-unit systems affording error correction by automatic repetition)

Recommendation U.20

In force components
Number	Title	Status
U.20 (11/88)	Telex and gentex signalling on radio channels (synchronous 7-unit systems affording error correction by automatic repetition)	In force