V21
V21 or V.21 may refer to :
- ITU V.21, an ITU-T modem recommendation for full-duplex communication between two analogue dial-up modems
- Fokker V.21, a German Fokker D.VII prototype with tapered wings
This is an old revision of this page, as edited by Conquerist (talk | contribs) at 22:16, 17 February 2014 (ITU V.21 is not an article). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.
V21 or V.21 may refer to :