United States Patent [19] [ii] Patent Number: 4,862,456
Giorgio [45] Date of Patent: Aug. 29, 1989
[54] HIGH SPEED MODEM
[75] Inventor: Paul J. Giorgio, Providence, R.I.
[73] Assignee: The United States of America as
represented by the Secretary of the Navy, Washington, D.C.
[21] Appl. No.: 195,991
[22] Filed: May 4,1988
[51] Int. CI.* H04J 3/00
[52] U.S. CI 370/118; 375/8;
375/38; 370/112
[58] Field of Search 370/118, 112, 80, 103;
375/8, 38
[56] References Cited
U.S. PATENT DOCUMENTS
4,270,202 5/1981 Stuttard et al 370/80
4,383,316 5/1983 Seidel 370/118
4,578,796 3/1986 Charalambous et al 375/8
4,637,035 1/1987 Betts 375/8
4,734,920 3/1988 Betts 375/38
4,736,388 4/1988 Eguchi 375/8
4,775,987 10/1988 Miller 370/118
Primary Examiner—Douglas W. Olms
Assistant Examiner—Min Jung
Attorney, Agent, or Firm—Arthur A. McGill; Prithvi C.
Lall; Michael J. McGowan
[57] ABSTRACT
A multiline modem system provides to a computer connection a plurality of telephone lines for transmitting and receiving digital computer data at throughput rates that exceed those of single line modem systems. The system determines the number of available telephone lines, sequences through a series of telephone re-dials, and acknowledges all connections. When the last connection is verified, the system is on-line and data transfer can begin. The system described uses state-ofthe-art components and meets FCC Part 68 requirements for connection to the switched telephone network.
7 Claims, 5 Drawing Sheets
