公开(公告)号：EP0142302A3

公开(公告)日：1986-10-01

申请号：EP84307310

申请日：1984-10-24

申请人： AMERICAN TELEPHONE AND TELEGRAPH COMPANY

发明人： Charalambous, Salomi Theodoulous ,  Horvath, Mark Philip ,  House, Cathy Pietsch ,  Iapicco, Jeffrey Allen ,  Lue, Paul Dave ,  Verma, Shiv Prakash

IPC分类号： H04M11/06

CPC分类号： H04M11/06 ,  H04L27/00

摘要： @ A digital processor based voiceband modem (104) that provides computers and terminals access to telephone lines (102) 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 (104) utilizes a signal processor (124) that executes various signal converting algorithms under control of selected sets of instructions and further utilizes a digital processor (127) 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.