Telephonic communications – Centralized switching system – Switching controlled in response to called station...
Patent
1993-06-11
1995-12-26
Hofsass, Jeffery A.
Telephonic communications
Centralized switching system
Switching controlled in response to called station...
379 88, 379 97, 379386, 379399, H04M 150
Patent
active
054794986
ABSTRACT:
A digital line card is provided for use in an electronic messaging system for enabling the receipt of voice and text or image data over a single communications port. The digital line card includes a digital signal processing integrated circuit, a microprocessor and a random access memory component for storing coding schemes employed by the digital signal processing integrated circuit. The digital line card is programmed to detect the presence of dual-tone multifrequency command signals in the incoming data stream, and to switch between voice and data processing responsive to the command signals.
REFERENCES:
patent: 4652700 (1987-03-01), Matthews et al.
patent: 4659876 (1987-04-01), Sullivan et al.
patent: 4689760 (1987-08-01), Lee et al.
patent: 4774590 (1988-09-01), Haganume et al.
patent: 4893333 (1990-01-01), Baran et al.
patent: 4908850 (1990-03-01), Masson et al.
patent: 4914704 (1990-04-01), Cole et al.
patent: 4916726 (1990-04-01), Morley et al.
patent: 4918722 (1990-04-01), Duehren et al.
patent: 4974254 (1990-11-01), Perine et al.
patent: 4989232 (1991-01-01), Tsumura
patent: 4994926 (1991-02-01), Gordon et al.
patent: 5008926 (1991-04-01), Misholi
patent: 5222120 (1993-06-01), McLeod et al.
patent: 5274696 (1993-12-01), Perelman
patent: 5349636 (1994-09-01), Irribarren
FaxMemo Product Literature, Centigram Communications Corporation, Apr. 1991.
Integrated Voice/Fax Mail Product Literature, Digital Sound Corporation, 1992.
Fax Management, AudioFax Classes of Service, Series 100 and 300 Application Note, AudioFAX, Inc., 1992.
"Brooktrout unveils 4-port voice/facsimile/data card", Network World, Jul. 27, 1992.
"The Universal Port", product brochure, Brooktrout Technology, circa Jun. 1992.
P. Mock, "Add DTMF Generation and Decoding to DSP-mP Designs", Electronic Design News, vol. 30, No. 6, pp. 205-213, Mar. 1985.
"Sleeper Product--A Combo Voice/Data I/O Card--Awakens Interest", Electronic Engineering Times, pp. 80-81, Nov. 11, 1985 (CMP Publications).
P. Ehlig, "DSP Chip Adds Multitaking Telecom Capability To Engineering Workstation", Electronic Design, vol. 33, No. 10, pp. 173-184, May 2, 1985.
J. D. Mills et al., "A Data And Voice System For The General Service Telephone Network", Proceedings of IECON '87, vol. 2, pp. 1143-1148, Nov. 1987.
Brandman Yigal
Lin Frank C. H.
Olson Peter D.
Puri Manoj
Subramaniam Jason
Hofsass Jeffery A.
Octel Communications Corporation
Pisano Nicola A.
Tsang Fan
LandOfFree
Digital line card having universal port for upgrading electronic does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Digital line card having universal port for upgrading electronic, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital line card having universal port for upgrading electronic will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1374931