IEC 60050-721 Ed. 1.0現行
International Electrotechnical Vocabulary - Chapter 721: Telegraphy, facsimile and data communication
出版：International Electrotechnical Committee
專家解讀視頻
It has the status of a horizontal standard in accordance with IEC Guide 108<
NFC 01 721:1996 - Identical
BS 4727-3:Group 03:1992 - Equivalent
NEN 10050-721:1995 - Identical
IEV KAPITEL 721 - Identical
PN IEC 50(721):1998 - Identical
UNE 21302-721:1992 - Identical
