Mark Horvath

US Patent:

45787964, Mar 25, 1986

Filed:

Nov 3, 1983

Appl. No.:

6/548340

Inventors:

Salomi T. Charalambous - Lincroft NJ
Mark P. Horvath - Lincroft NJ
Cathy P. House - Alden NY
Jeffrey A. Iapicco - Lincroft NJ
Paul D. Lue - Freehold NJ
Shiv P. Verma - Cedar Knoll NJ

Assignee:

Bell Telephone Laboratories, Incorporated - Murray Hill NJ
AT&T Information Systems Inc. - Holmdel NJ

International Classification:

H04B 138
H04L 516
H04L 2710
H04L 2718

US Classification:

375 8

Abstract:

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.