| 单词 | V Series |
| 释义 | V Series Table V-3: Selected ITU-T V-Series Recommendations (continued) Recommendation Number Description V.22bis 2400 bps FDX modems using the frequency division multiplexing (FDM) tech- nique for use over dial-up PSTN circuits and point-to-point two-wire leased lines V.23 600/1200-baud synchronous and asynchronous HDX modems for use over dial- up PSTN circuits and point-to-point two-wire leased lines V.24 Definitions for interchange circuits between data terminal equipment (DTE) and data circuit-terminating equipment (DCE) V.26 2400 bps FDX modems for use on four-wire leased lines V.26bis 1200/2400 bps FDX modems for use over dial-up PSTN circuits V.26ter 2400 bps FDX modems with echo cancellation for use over dial-up PSTN circuits and point-to-point two-wire leased lines V.27 4800 bps FDX modems with manual equalization for use on leased lines V.27bis 2400/4800 bps FDX modems with automatic equalization for use on leased lines V.27ter 2400/4800 bps FDX modems for use for use over dial-up PSTN circuits V.28 Electrical characteristics for unbalanced double-current interchange circuits V.29 9600 bps HDX and FDX modems for use on point-to-point four-wire leased lines V.32 9600 bps FDX modems with echo cancellation for use over dial-up PSTN circuits and point-to-point two-wire leased lines V.32bis 4800/7200/9600/12,000/14,4000 bps FDX modems with echo cancellation for use over dial-up PSTN circuits and point-to-point two-wire leased lines V.33 12,000/14,400 bps synchronous FDX modems for use on point-to-point four-wire leased lines V.34 28.8 kbps modems for use over dial-up PSTN circuits and point-to-point two- wire leased lines V.34bis 33.6 kbps modems for use over dial-up PSTN circuits and point-to-point two- wire leased lines V.35 All that remains of this modem specification is a clunky connector for serial data. V.41 Code-independent error-control system V.42 Error-correcting procedures for DCE using asynchronous-to-synchronous conversion V.42bis Data compression procedures for DCE using error correction procedures V.43 Data flow control V.44 Data compression procedures V.54 Loop test devices for modems V.56 Comparative tests of modems for use over two-wire voice grade PSTN connections V.56bis Network transmission model for evaluating modem performance over two-wire voice grade PSTN connections V.56ter Test procedure for evaluation of two-wire 4 kHz voiceband FDX modems 74570c22.qxd 9/12/07 12:48 AM Page 532 |
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