Intelligent modem system which determines proper access thereto
First Claim
1. An intelligent modem system for connection between an information processing terminal and a public communication line comprising:
- means for storing at least an identification code in said modem system;
means for providing a detection signal when an incoming call from a calling remote party is detected on said communication line;
a modem circuit for modulating data sent to said communication line and demodulating data received from said communication line; and
reception operation control means for verifying during a connection period when a calling remote party is communicating with said modem system over said public communication line that said remote party is authorized to communication with said information processing terminal and comprising;
means responsive to said detection signal for answering an incoming call on said communication line and for operating said modem circuit to establish a data communication connection with said calling remote party;
means operative after said data communications connection is established and during said connection period for verifying that an identification code received from said calling remote party bears a correspondence to said stored identification code;
means for starting a continuous transmission of data to said calling remote party after said identification code has been verified;
means for discontinuing said continuous transmission of data upon receiving a continuous transmission of data from said calling remote party; and
means for connecting said information processing terminal with said modem circuit during said connection period to enable communications between said terminal and said calling remote party through said modem circuit only when said received identification code is verified and said continuous transmission of data has been discontinued by said means for discontinuing said continuous transmission of data.
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Accused Products
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.
65 Citations
14 Claims
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1. An intelligent modem system for connection between an information processing terminal and a public communication line comprising:
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means for storing at least an identification code in said modem system; means for providing a detection signal when an incoming call from a calling remote party is detected on said communication line; a modem circuit for modulating data sent to said communication line and demodulating data received from said communication line; and reception operation control means for verifying during a connection period when a calling remote party is communicating with said modem system over said public communication line that said remote party is authorized to communication with said information processing terminal and comprising; means responsive to said detection signal for answering an incoming call on said communication line and for operating said modem circuit to establish a data communication connection with said calling remote party; means operative after said data communications connection is established and during said connection period for verifying that an identification code received from said calling remote party bears a correspondence to said stored identification code; means for starting a continuous transmission of data to said calling remote party after said identification code has been verified; means for discontinuing said continuous transmission of data upon receiving a continuous transmission of data from said calling remote party; and means for connecting said information processing terminal with said modem circuit during said connection period to enable communications between said terminal and said calling remote party through said modem circuit only when said received identification code is verified and said continuous transmission of data has been discontinued by said means for discontinuing said continuous transmission of data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification