Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...
Patent
1990-07-30
1992-07-14
Dwyer, James L.
Telephonic communications
Telephone line or system combined with diverse electrical...
Having transmission of a digital message signal over a...
380 25, 375 8, H04M 1100
Patent
active
051310252
ABSTRACT:
An intelligent modem system which is used for connecting an information processing terminal such as a microcomputer with a public communication line by modulating and demodulating the data transmitted between the information processing terminal and the public communication line, comprising: an information set up circuit which can set up at least ID information; and a reception operation control circuit which verifies if an incoming call is from an authorized party or not by responding to the public communication line according to the ID information, and connects a modem circuit connected to the public communication line to a line leading to the information processing terminal only when an incoming call is confirmed to be from an authorized party. Thereby, the information processing terminal connected to the modem system may not be equipped with an arrangement to identify the other parties of communication whereby the cost for software for the information processing terminal may be reduced, and, when an attempt is made by an unauthorized party to get access to the modem system, the information processing terminal may continue the execution of the current jobs without being disrupted by any such unauthorized incoming calls.
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Chan Wing F.
Dwyer James L.
Omron Tateisi Electronics Co.
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