United States Patent  [li] Patent Number: 4,578,796
Charalambous et al.  Date of Patent: Mar. 25, 1986
 PROGRAMMABLE MULTIPLE TYPE DATA SET
 Inventors: Salomi T. Charalambous; Mark P.
Horvath, both of Lincroft, N.J.;
Cathy P. House, Alden, N.Y.; Jeffrey
A. Iapicco, Lincroft, N.J.; Paul D.
Lue, Freehold, N.J.; Shiv P. Verma,
Cedar Knoll, N.J.
 Assignees: Bell Telephone Laboratories,
Incorporated, Murray Hill; AT&T Information Systems Inc., Holmdel, both of N.J.
 Appl. No.: 548,340
 Filed: Nov. 3,1983
 Int. CI." H04B 1/38; H04L 5/16;
H04L 27/10; H04L 27/18
 U.S. Q 375/8; 375/45;
 Field of Search 375/7, 8, 9, 45, 52,
375/56; 329/1, 2; 332/1
 References Cited
U.S. PATENT DOCUMENTS
3,699,525 10/1972 Klavins 340/172.5
3,958,191 5/1976 Jones, Jr 332/1
4,085,449 4/1978 Walsh et al 375/8
4,263,670 4/1981 Sherman 375/9
4,425,664 1/1984 Sherman et al 375/8
A digital processor based voiceband modem that provides computers and terminals access to telephone lines and performs line control functions to originate, answer and terminate data calls in addition to converting baseband signals to voiceband and voiceband signals to baseband. The modem utilizes a signal processor that executes various signal converting algorithms under control of selected sets of instructions and further utilizes a digital processor that executes line control algorithms for alternative modes (i.e., originate or answer) of the data modem. An outgoing or incoming call enables the appropriate mode and, during the execution of the corresponding line control algorithm, various sets of instructions are selected to execute signal converting algorithms appropriate for the enabled mode of a specific one of various data modem types.
9 Claims, 20 Drawing Figures