Appendix4-MiscSt.docVIP

Miscellaneous Standards ITU V Standards V.1 Defines bits as mark/space voltage levels V.2 Power levels for modems signals over telephone loops V.3 International Alphabet No. 5 V.4 The data frame - The general structure of V.5 signals V.5 Synchronous signaling rates for dial-up lines V.6 Synchronous signaling rates on leased lines V.7 A list of modem terms in English, French, and Spanish V.10 Unbalanced high speed interfaces [RS-423] V.11 Balanced high speed interfaces [RS-422] V.14 Asynchronous to synchronous conversion V.15 Telephone acoustic couplers V.16 Medical analog data modems V.17 Group 3 fax modulation. Two wire, half-duplex, trellis coded, 7200, 9600, 12000, 14400 bps. V.19 DTMF modems V.20 Parallel data modems in the PSTN V.21 300 bps FSK modem [Bell 103] V.22 1200 bps [600 baud] FSK modem [Bell 112A] V.22bis QAM 2400 bps modems with 1.2 Kbps fallback V.23 600/1200bps FM modem with a 75 bps reverse channel. Used on some videotext systems V.24 Defines the interface between DCE and DTE. Equivalent to functional part of EIA RS-232C V.25 Automatic calling and answering equipment with manual enabling of echo suppression. V.25bis Bit synchronous auto-dialing protocol. Equivalent to the Hayes AT commands V.26 2400 bps [1200 baud] 4 wire full duplex PSK modem V.26bis 2400 bps [1200 baud] half duplex PSK modem usable over the switched network. V.26terbo 2400/1200 bps [1200 baud] PSK full duplex modem V.27 4800 bps [1600 baud] PSK modem V.27bis 4800/2400 [1600/1200 baud] PSK modem. Usable on leased circuits. V.27terbo 4800/2400 PSK modem used for half duplex Group 3 fax at 1600/1200 baud. Used on the switched network. V.28 Defines the electrical characteristics of V.24 or RS-232 V.29 9600/7200/4800/ [2400 baud] PSK/QAM modem. Often used for Group 3 fax over the switched network. V.31 Electrical characteristics for single circuit interexchange circuits controlled by contact closure. V.32 9600/4800 [2400 baud] QAM full duplex modem using trellis coding and echo ca