ZyXEL Elite 2864 User Guide - Page 255

X.400-X.430 Message transmission systems. X.400 Layer model - Service elements of the layers. X.430 Access protocols for terminals. Data transmission through telephone networks (V.1 -V.110) V.1-V.7 General. V.10-V.34 Interfaces and Modems in the telephone bandwidth. V.21 300 bps modems for use in public telephone networks. V.22 1200 bps duplex modems for use in public telephone networks and on leased lines. V.22bis 2400/1200 bps duplex modem for use in public telephone networks and on leased lines. V.23 600/1200 bps modem for use in public telephone networks. V.32 Duplex modem family with up to 9600 bps for public telephone networks and leased lines. V.32bis Duplex modem family with up to 14400 bps for public telephone networks and leased lines. V.34 This standard allows modem connections at up to 28800 bps. This standard has very many optional features, including, but not limited to various baud rates and modulation schemes. V.35-V.37 Wide band modems. V.10, V.41-V.42 Error control protocols. V.10 Error display in electromechanical devices. V.41 Code independent error protection system. V.42 Error protection through LAPM and MNP4. V.42bis Data compression using string tables. V.50-V.110 Transmission quality and support. V.54 Loopback tests for modems. V.57 Sensing device for high-speed transmission. E-3