EP0144042A2
Expired / Lapsed
EP
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A method and an apparatus for maintaining digital communication in a single session
Assignee: CYGNET TECHNOLOGIES Inc
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Filing: 1984-11-22
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Granted: —
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Expires: 2004-11-22
Abstract
Abstract In the present invention, a method and an apparatus is disclosed in which digital communication between two like apparatuses is maintained in a single session in the presence of interrupt signals. When an interrupt signal occurs in the communication medium, the apparatus is temporarily switched to a quiescent period in which either transmission is ceased or transmission occurs over an energy band which is not detectable by the like apparatus as a carrier signal. The apparatuses then reconnect and resume the "handshake" as if the session has just commenced. After the "handshake" protocol, digital communication is resumed.
Inventors
- 👤 Randy Presuhn
- 👤 Stephen Kerman
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 07:57
CPC Classifications
H; H04; H04M; H04M11/00; H04M11/06
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
194 words
An apparatus for maintaining digital communication in a single session with another digital apparatus, via a communication medium, said apparatus having modem means for transmitting and receiving data signals to and from said another digital apparatus, said modem means for receiving data signals on a first carrier signal, said modem means having means for detecting said first carrier signal; and said modem means for transmitting date signals on a second carrier signal to said another digital apparatus; said apparatus subject to an interrupt signal causing a cessation in the detection of said first carrier signal; wherein said improvement comprising: means for suppressing said modem means from transmitting energy to said another digital apparatus, wherein said energy being detectable by said another digital apparatus as a second carrier signal; and computer control means for receiving said first carrier signal; for controlling said modem and said suppressing means said computer control means for automatically activating said suppressing means upon the detection of a cessation in said first carrier signal; to wait a predetermined period of time; to deactivate said suppressing means; and for causing said modem means to transmit said second carrier signal to re-establish communication.
Claim 2
Independent Claim
194 words
An apparatus for maintaining digital communication in a single session with another digital apparatus, via a communication medium, said apparatus having modem means for transmitting and receiving data signals to and from said another digital apparatus, said modem means for receiving data signals on a first carrier signal, said modem means having means for detecting said first carrier signal; and said modem means for transmitting date signals on a second carrier signal to said another digital apparatus; said apparatus subject to an interrupt signal causing a cessation in the detection of said first carrier signal; wherein said improvement comprising: means for suppressing said modem means from transmitting energy to said another digital apparatus, wherein said energy being detectable by said another digital apparatus as a second carrier signal; and computer control means for receiving said first carrier signal; for controlling said modem and said suppressing means said computer control means for automatically activating said suppressing means upon the detection of a cessation in said first carrier signal; to wait a predetermined period of time; to deactivate said suppressing means; and for causing said modem means to transmit said second carrier signal to re-establish communication.
Claim 3
Dependent Claim
108 words
The apparatus of Claim 1, wherein said suppressing means is a switch means interposed between said communication medium and said modem means; said switch means being adapted to connect said medium in a first position and in a second position, wherein in said first position said medium is connected to said modem; and wherein in said second position, said medium is connected to an open position in said switch means; and wherein said computer control means switches said switch means to said second position upon the detection of a cessation in the first carrier signal and to switch back to said first position after said period of time.
Claim 4
Dependent Claim
16 words
The apparatus of Claim 2, wherein said period of time is greater than one (1) second.
Claim 5
Dependent Claim
19 words
The apparatus of Claim 1, wherein said suppressing means is means for generating a signal below approximately 400 Hz.
Claim 6
Independent Claim
111 words
A method for maintaining digital communication, by an apparatus, with another digital apparatus, via a communication medium, in a single session, said apparatus having modem means for transmitting and receiving data signals to and from said another digital apparatus, said modem means for receiving data signals on a first carrier signal? and said modern means for transmitting data signals on a second carrier signal, said method comprising detecting a cessation in the first carrier signal; suppressing the transmission of signals detectable by said another digital apparatus as a second carrier signal; waiting a predetermined period of time; and transmitting said second carrier signal to said another digital apparatus to resume communication.
Claim 7
Independent Claim
111 words
A method for maintaining digital communication, by an apparatus, with another digital apparatus, via a communication medium, in a single session, said apparatus having modem means for transmitting and receiving data signals to and from said another digital apparatus, said modem means for receiving data signals on a first carrier signal? and said modern means for transmitting data signals on a second carrier signal, said method comprising detecting a cessation in the first carrier signal; suppressing the transmission of signals detectable by said another digital apparatus as a second carrier signal; waiting a predetermined period of time; and transmitting said second carrier signal to said another digital apparatus to resume communication.
Claim 8
Dependent Claim
51 words
The method of Claim 5, wherein said suppressing step comprising: switching said medium from being connected to said modem to being connected to an open position; and said method further comprising switching said medium from being connected to an open position to being connected to said modem; after said waiting step.
Claim 9
Independent Claim
161 words
A system for maintaining digital communication between an apparatus and a like apparatus via a communication medium, in a single session, each of said apparatuses comprising: modem means for transmitting data signals to the other like apparatus on a carrier signal and for receiving data signals transmitted from the other like apparatus on a different carrier signal; means for detecting said different carrier signal; means for suppressing said modem means from transmitting energy to said like apparatus, wherein said energy being detectable by said like apparatus as a carrier signal; and computer control means for receiving said detected different carrier signal; for controlling said modem and said suppressing means; said computer control means for automatically activating said suppressing means upon the detection of a cessation in said different carrier signal; to wait a predetermined period of time; to deactivate said suppressing means, and for causing said modem means to transmit said carrier signal to the other like apparatus to resume communication.
Claim 10
Independent Claim
161 words
A system for maintaining digital communication between an apparatus and a like apparatus via a communication medium, in a single session, each of said apparatuses comprising: modem means for transmitting data signals to the other like apparatus on a carrier signal and for receiving data signals transmitted from the other like apparatus on a different carrier signal; means for detecting said different carrier signal; means for suppressing said modem means from transmitting energy to said like apparatus, wherein said energy being detectable by said like apparatus as a carrier signal; and computer control means for receiving said detected different carrier signal; for controlling said modem and said suppressing means; said computer control means for automatically activating said suppressing means upon the detection of a cessation in said different carrier signal; to wait a predetermined period of time; to deactivate said suppressing means, and for causing said modem means to transmit said carrier signal to the other like apparatus to resume communication.
Claim 11
Dependent Claim
108 words
The apparatus of Claim 7, wherein said suppressing means is a switch means interposed between said communication medium and said modem means; said switch means being adapted to connect said medium in a first position and in a second position, wherein in said first position said medium is connected to said modem; and wherein in said second position, said medium is connected to an open position in said switch means; and wherein said computer control means switches said switch means to said second position upon the detection of a cessation in the first carrier signal and to switch back to said first position after said period of time.
Claim 12
Dependent Claim
16 words
The apparatus of Claim 8, wherein said period of time is greater than one (1) second.
Claim 13
Dependent Claim
19 words
The apparatus of Claim 7, wherein said suppressing means is means for generating a signal below approximately 400 Hz.
References Cited (Backward Citations)
No citation records indexed.
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