V Series

The series of ITU-T Recommendations specifying protocols relating to data communication

over the over the public switched telephone network (PSTN). V-series specifications largely relate to modems, data interfaces on modems (e.g.,V.35, discontinued as a modem recommendation but still alive as a connector), and modem communications protocols, over dial-up and leased lines in both full duplex (FDX) and half-duplex (HDX). See Table V-3 for selected V-series Recommendations. For a full listing of ITU-T Recommendations, see the contact information in Appendix A.

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