Multiplex communications – Wide area network – Packet switching
Patent
1984-03-20
1987-06-09
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 29, 375 1, H04J 112, H04J 114
Patent
active
046726055
ABSTRACT:
A high speed and relatively error free communications system is disclosed which enables the high speed transmission of data at a 19.2 kilobit per second rate. The data is transmitted over the same communications medium as voice transmissions, the data transmission being virtually imperceptible to the user of the analog telephone system. Connection to and from the data terminals is made through an RS232C interface. A spread spectrum technique is utilized which "whitens" the signals of the data terminal regardless of whether the terminal is idle, transmitting or receiving data. Virtual error free transmission is achieved by interleaving bits, so that noise does not destroy the data, and by error detection and correction techniques which assure that the data, as received, is identical to that transmitted. By using a variable pseudo random code, privacy of data communications are enhanced and cross-talk is substantially eliminated. The resulting system is one that can use a single twisted pair wire for transmission and is capable of transmitting data at a high rate of speed while leaving the analog voice transmission resident and unaffected on the line.
REFERENCES:
patent: 3406344 (1968-10-01), Hopper
patent: 3512160 (1970-05-01), Meeker
patent: 3529088 (1970-09-01), Hauer
patent: 3832712 (1974-08-01), Goetz et al.
patent: 3838444 (1974-09-01), Loughlin et al.
patent: 3894190 (1975-07-01), Gassmann
patent: 3906173 (1975-09-01), Bradley
patent: 3916340 (1975-10-01), Scott
patent: 3956601 (1976-05-01), Harris et al.
patent: 3972000 (1976-07-01), Desblache et al.
patent: 3980825 (1976-09-01), Morrien
patent: 4171467 (1979-10-01), Evenchik
patent: 4209841 (1980-06-01), Bambara et al.
patent: 4231113 (1980-10-01), Blasbalg
patent: 4238849 (1980-12-01), Gassmann
patent: 4271502 (1981-06-01), Goutmann et al.
patent: 4327419 (1982-04-01), Deutsch
patent: 4352182 (1982-09-01), Billi et al.
patent: 4425642 (1984-01-01), Moses et al.
patent: 4425661 (1984-01-01), Moses et al.
"Time-Shared . . . " by Inoue et al., IEEE Trans. on Comm., vol. com-29, No. 11, Nov. 1981, pp. 1565-1572.
"Two-Wire Digital . . . " by Ahamed, IEEE Trans. on Comm., vol. com-29, No. 11, Nov. 1981, pp. 1554-1564.
"A Loop Access . . . " by Bosik et al., IEEE, 1982.
"Time-Compression Multiplexing: Squeezing Digits Through Loops"; AT&T Bell Laboratories Record; Barry S. Bosik; Feb. 1984, pp. 21-25 370/29.
"PCM Toll Switching Networks using Partial-Access Pulse Shifters" by Saito et al.; Electronics and Communications in Japan, vol. 59-A, No. 7, 1976, 370/68.
Principles of Data Communication by Lucky et al., 1968 p. 281.
Bradford Robert S.
Hustig Charles H.
Moses Donald W.
Ward Jeffrey L.
Applied Spectrum Technologies, Inc.
Olms Douglas W.
LandOfFree
Data and voice communications system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Data and voice communications system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Data and voice communications system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1834447