System and method for automatically selecting the mode of commun

Details System and method for automatically selecting the mode of commun System and method for automatically selecting the mode of commun

1997-01-09

1998-08-18

Kuntz, Curtis

Telephonic communications

Telephone line or system combined with diverse electrical...

Having transmission of a digital message signal over a...

379 9332, 379 9334, 379 9326, 375222, 455557, H04M 1100

Patent

active

057968080

ABSTRACT:
A system is provided for automatically selecting the mode of communication between a plurality of multi-mode modems. A calling modem and an answering modem are disposed for intercommunication across an established communication link of a telephone network. The calling modem transmits a continuous calling signal across the established link, and the answering modem detects the calling signal and analyzes the calling signal to determine the configuration of the calling modem. In response, the answering modem generates and transmits an answering signal across the established link. The calling modem detects and analyzes the answering signal to determine the configuration of the answering modem. Finally, the system determines whether the established link passes through a PSTN, and if so, transmits a 2100 hertz tone across the established link. Otherwise, the system proceeds directly to the a modem training sequence.

REFERENCES:
patent: 4931250 (1990-06-01), Greszczuk
patent: 5311578 (1994-05-01), Bremer et al.
patent: 5528679 (1996-06-01), Taarud

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