Facsimile and static presentation processing – Facsimile – Auxiliary signal
Patent
1998-03-26
2000-12-12
Williams, Kimberly A.
Facsimile and static presentation processing
Facsimile
Auxiliary signal
358412, 37910001, H04N 100
Patent
active
061606375
ABSTRACT:
A data communication apparatus having a low transmission mode and a high transmission mode. The apparatus includes a switch selector switching the transmission mode between the high transmission mode and the low transmission mode based on a received switching signal. A mode detector detects whether the switch selector has switched the transmission mode to the low transmission mode. A timer starts to clock a time period after the switch selector has switched the transmission mode from the high transmission mode to the low transmission mode. A rate detector detects a data bit-rate in the high transmission mode. A calculator calculates a waiting period based on the detected bit-rate. A disconnect unit disconnects a telephone line if the clocked time period exceeds the waiting period.
REFERENCES:
patent: 5001571 (1991-03-01), Murano
patent: 5057938 (1991-10-01), Edamura
patent: 5303066 (1994-04-01), Kawaguchi
patent: 5353125 (1994-10-01), Nakagawa et al.
patent: 5406388 (1995-04-01), Matsuzaki
patent: 5477340 (1995-12-01), Hasegawa
"Procedures For Starting Sessions Of Data Transmission Over The General Switched Telephone Network", ITU-T Recommendation V.8, International Telecommunication Union, Sep. 1994, p. 1-10.
"A modem operating at data signalling rates of up to 33 600 bit/s for use on the general switced telephone network and on leased point-to-point 2-wire telephone-type circuits", ITU-T Recommendation V.34, International Telecommunication Union, Oct. 1996, p. 1-67.
"Procedures For Starting Sessions Of Data Transmission Over The Public Switched Telephone Network", Draft ITU-T Recommendation V.8, International Telecommunication Union, Sep. 12, 1997, p. 3-10.
Ricoh & Company, Ltd.
Williams Kimberly A.
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