V.28

<communications, standard> An ITU-T physical interface standard for serial data communications equipment, formally titled "Electrical Characteristics for Unbalanced Double-Current Interchange Circuits".

The combination of V.28 and V.24 is equivalent to the EIA's RS-232 and uses the same 25-pin connectors.

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V.23 V.24 V.25 V.25 bis V.27 ter	EIA-232 International Telecommunications Union RS-232D V.28	V.29 V.32 V.32bis V.32ter V.34