An Experiment of Data Transfer with V.32bis MODEM on a Telephone Line and Enhance the Communication Efficiency

摘要

In fact a few years ago, the maximum telephone line MODEM speed was 9600 bps, now it has 14400 bps or 28800 bps for a technological innovation in recently. We tried to make an experiment of data transfer with V.32bis MODEM on a telephone line; that used English text file, Japanese text files, NOAA ATP image files and MS-DOS execute files. A transmission control protocol used the normal mode, the YMODEM-g and the ZMODEM. The object of this experiment, we would like to data of transmission and receiving in detail with V.32 bis MODEM and to confirm the cmmunication efficiency. Done results were as follows; 1) A MODEM speed 14400 bps of data transfer rate was about 150-200% with none compression files and compression files 130-160% more than 9600 bps. 2) When the compression files used to increase communication efficiency that was 130-160% more than none compression files. 3) It has used A transmission control protocol with YMODEM-g or ZMODEM to increase communication efficiency.