Fast-speed videotex is defined as the access to videotex services via the PSTN with a modem speed faster than 2400 biîh in both ways (modems V.27 fer short train, V.29 short train as defined by Recommendations T.104, V.32, V.32 bis, V.34).
ITU-T F.301 SPANISH-1995 history
1995ITU-T F.301 SPANISH-1995 Fast Speed PSTN Videotex - Operations and Quality of Service Telematic Service Study Group 1