It has the status of a horizontal standard in accordance with IEC Guide 108.
IEC 60050-721 Ed. 1.0 b:1991
$193.00
International Electrotechnical Vocabulary (IEV) – Part 721: Telegraphy, facsimile and data communication
Category: IEC
$193.00
International Electrotechnical Vocabulary (IEV) – Part 721: Telegraphy, facsimile and data communication