Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...
Patent
1992-11-19
1994-09-20
Kuntz, Curtis
Telephonic communications
Telephone line or system combined with diverse electrical...
Having transmission of a digital message signal over a...
379 93, 375 8, H04M 1100, H04B 138
Patent
active
053496353
ABSTRACT:
A V.32 compatible modem provides a full-duplex mode of operation, while a 208B compatible modem provides a half-duplex mode of operation. The connect sequence of a V.32 compatible modem is modified so that it will automatically determine if the other modem, whether the originating modem or the answering modem, is a 208B type of modem or a V.32 type of modem. In one embodiment of the invention, the connect sequence of an originating V.32 modem is modified to detect either a 2100 Hz answer tone, which represents that the answering modem is a V.32 type of modem, or a 2021 Hz answer tone, which represents that the answering modem is a 208B type of modem. In another embodiment of the invention, the connect sequence of an answering V.32 modem is modified to transmit first a 2100 Hz answer tone and then, if no 1800 Hz V.32 signal "AA" is received from the originating modem, to transmit a 2021 Hz answer tone, thereby simulating a 208B modem has answered the data call. In either case, once the identity of the other modem is determined, this modified modem will then switch to either a half-duplex mode or a full-duplex mode of operation as appropriate.
REFERENCES:
patent: 4215243 (1980-07-01), Maxwell
patent: 4471489 (1984-09-01), Konetski et al.
patent: 4599719 (1986-07-01), Breen et al.
patent: 4680773 (1987-07-01), Amundson
patent: 4782498 (1988-11-01), Copeland, III
patent: 4931250 (1990-06-01), Greszczuk
Advertisement, "Motor Mouth." -Racal-Vadic, The Dial-Up Authority, Network World, Nov. 12, 1990.
Manual pages for Racal-Vadic 9642PA, pp. 2-23, 2-24.
Affidavit by Richard E. McCartney, Largo, Fla.
Annex A to Recommendation V. 32 bis.
AT&T Bell Laboratories
Chan Jason
Kuntz Curtis
Opalach Joseph J.
LandOfFree
Half-duplex or full-duplex automode operation for use in data co does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Half-duplex or full-duplex automode operation for use in data co, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Half-duplex or full-duplex automode operation for use in data co will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2430558