Emergency calling via a cable modem
First Claim
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1. A system comprising:
- a memory adapted to store a number of emergency telephone numbers;
a controller adapted to generate a control signal in response to first digits of a telephone number generated by a subscriber telephone connected to a cable modem upon the first digits containing a telephone number corresponding to one of the emergency telephone numbers stored in the memory; and
a signal transmitter adapted to generate second digits corresponding to the first digits in response to the control signal from the controller and to transmit the second digits for the emergency telephone number to a Public Switched Telephone Network (PSTN) via a PSTN backup line connected to the cable modem.
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Abstract
An emergency calling system and method via a cable modem includes a cable modem connected to a Public Switched Telephone Network (PSTN) backup line in a cable modem-based Internet telephone service to transmit the emergency telephone number inputted by a subscriber telephone to the PSTN via the PSTN backup line. This enables an emergency calling function via a PSTN backup circuit and stable PSTN in a cable modem-based Internet telephone service. This also allows a cable modem-based Internet telephone service to promptly provide urgent emergency calling via the PSTN line in case of an emergency.
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Citations
15 Claims
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1. A system comprising:
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a memory adapted to store a number of emergency telephone numbers;
a controller adapted to generate a control signal in response to first digits of a telephone number generated by a subscriber telephone connected to a cable modem upon the first digits containing a telephone number corresponding to one of the emergency telephone numbers stored in the memory; and
a signal transmitter adapted to generate second digits corresponding to the first digits in response to the control signal from the controller and to transmit the second digits for the emergency telephone number to a Public Switched Telephone Network (PSTN) via a PSTN backup line connected to the cable modem. - View Dependent Claims (2, 3, 4, 5, 6, 7, 9)
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8. A system comprising:
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a memory adapted to store a number of emergency telephone numbers;
a digit recognition unit adapted to generate a telephone number selected by a subscriber in response to first digits generated by a subscriber telephone connected to a cable modem;
a controller adapted to compare the telephone number generated by the digit recognition unit with the emergency telephone numbers stored in the memory and to output a control signal to generate second digits corresponding to the emergency telephone number selected by the user according to the type of the subscriber telephone upon the telephone number selected by the subscriber corresponding to one of the telephone numbers stored in the memory;
a Dual Tone Multi-Frequency (DTMF) signal-generator adapted to generate a DTMF signal corresponding to the emergency telephone number selected by the subscriber in response to the control signal from the controller upon the subscriber telephone being a digital telephone;
a DTMF signal transmitter adapted to transmit the DTMF signal generated by the DTMF signal-generator; and
an impedance matching unit adapted to match impedances between a Public Switched Telephone Network (PSTN) and the cable modem and to transmit the DTMF signal for the emergency telephone number from the DTMF signal transmitter to the PSTN via a PSTN backup line.
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10. A method comprising:
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generating a telephone number selected by a subscriber in response to digits generated by a subscriber telephone connected to a cable modem;
comparing the telephone number selected by the subscriber with a number of pre-stored emergency telephone numbers;
generating a Dual Tone Multi-Frequency (DTMF) signal corresponding to the telephone number selected by the subscriber upon the telephone number selected by the subscriber corresponding to one of the pre-stored emergency telephone numbers; and
transmitting the DTMF signal to a Public Switched Telephone Network (PSTN) via a PSTN backup line. - View Dependent Claims (11, 12)
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13. A method comprising:
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generating a telephone number selected by a subscriber in response to digits generated by a subscriber telephone connected to a cable modem;
comparing the telephone number selected by the subscriber with a number of pre-stored emergency telephone numbers;
generating a pulse signal corresponding to the emergency telephone number selected by the subscriber; and
transmitting the pulse signal to a Public Switched Telephone Network (PSTN) via a PSTN backup line. - View Dependent Claims (14, 15)
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Specification