Data access arrangement with telephone interface
First Claim
1. A data access arrangement (DAA) for coupling a local modem to a local telephone set across a single telephone line, in communication with a central office line, wherein the modem responds to signals received across the telephone set, the DAA being operable with program means for controlling communication between the modem and the telephone set, and for directing the modem to process the incoming signals received across the single telephone line through the telephone set, and for controlling the connection of the telephone set to the central office line, such that the single telephone line enables transmission of voice and data signals the DAA comprising:
- a current source adaptively coupled to the telephone set, the current source including;
a current regulator for providing a constant current to the telephone set when the telephone set is disconnected from the central office line, wherein a variable voltage is produced across the telephone set which varies according to the signals received across the telephone set, the current regulator operable with an input voltage, anda voltage reference circuit coupled to the current regulator, for enhancing the input voltage supplied to the telephone set; and
a voice relay for switching the connection of the telephone set between the central office line and the voltage regulator and voltage reference assembly in response to the program means, wherein for the modem and telephone set to communicate directly with each other independent of the central office line, the program means causes the relay to connect the telephone set to the voltage regulator and voltage reference assembly, thereby disconnecting the telephone set from the central office line.
6 Assignments
0 Petitions
Accused Products
Abstract
A data access arrangement (DAA) interface for alternately coupling a telephone set to a modem for operation in conjunction with and independent of the central office power supply line. The DAA interface provides an enhanced power supply to supply adequate power to the telephone set when the telephone set, or a computer coupled thereto, communicates with the modem independent of the central office line. Multiple relays are coordinated and controlled via an application program in communication with the modem which detects certain conditions representing incoming and outgoing telephone and data/facsimile calls, and commands the relays to respond to the conditions.
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Citations
23 Claims
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1. A data access arrangement (DAA) for coupling a local modem to a local telephone set across a single telephone line, in communication with a central office line, wherein the modem responds to signals received across the telephone set, the DAA being operable with program means for controlling communication between the modem and the telephone set, and for directing the modem to process the incoming signals received across the single telephone line through the telephone set, and for controlling the connection of the telephone set to the central office line, such that the single telephone line enables transmission of voice and data signals the DAA comprising:
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a current source adaptively coupled to the telephone set, the current source including; a current regulator for providing a constant current to the telephone set when the telephone set is disconnected from the central office line, wherein a variable voltage is produced across the telephone set which varies according to the signals received across the telephone set, the current regulator operable with an input voltage, and a voltage reference circuit coupled to the current regulator, for enhancing the input voltage supplied to the telephone set; and a voice relay for switching the connection of the telephone set between the central office line and the voltage regulator and voltage reference assembly in response to the program means, wherein for the modem and telephone set to communicate directly with each other independent of the central office line, the program means causes the relay to connect the telephone set to the voltage regulator and voltage reference assembly, thereby disconnecting the telephone set from the central office line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A data access arrangement (DAA) for operatively coupling a modem to a telephone set and a central office line, and for enabling the modem to communicate directly with the central office line across a single telephone line and for enabling the modem to communicate across the same single telephone line directly to the telephone set independent of the central office line, wherein the modem responds to incoming telephone calls which may include voice signals, data signals, and facsimile signals, the incoming telephone calls being represented by ringing, comprising:
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program means for controlling the connection of the modem in response to incoming telephone calls across the single telephone line; an off-hook relay coupled to the program means for connecting the modem to the central office line in response to a command from the program means; and a ring detector coupled to the program means and modem for detecting ringing representing incoming telephone calls, and for indicating the ringing to the program means, wherein after a predetermined number of rings is determined, the program means commands the modem to connect the modem to the central office line to enable the modem to receive and store any incoming voice, data, and facsimile signals. - View Dependent Claims (14, 15)
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16. A system for operatively coupling a modem to a telephone set independently or in conjunction with a central office line, wherein, depending upon the status of incoming and outgoing calls, the system enables the modem to communicate directly with the telephone set without central office line power, and also enables the modem to respond to incoming calls and to send outgoing calls over the central office line carrying DC current supplied by the central office line, further wherein when the modem is coupled to the telephone set and disconnected from the central office line, the modem can receive voice signals across the telephone handset, and when the modem is coupled to the central office line, the modem can receive data signals, fax signals, and voice signals, the system comprising:
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a computer programmed to provide commands to connect the modem to the central office line and to the telephone set; a DC holding circuit coupled to the modem for maintaining a substantially constant DC current flow to the modem when the modem is coupled to the central office line; an off-hook relay in communication with the computer for receiving computer commands and for disconnecting the modem from the central office line; a caller identification (CID) relay connected between the modem and the DC holding circuit for identifying an incoming call, wherein the computer controls energization of the CID relay such that when the CID relay is energized, the computer is able to identify the incoming telephone call, such that, depending upon the CID, the computer instructs the off-hook relay to connect the modem to the central office line; and a power supply adaptively coupled to the telephone set and modem, for supplying power to the telephone set independent of the central office line, the power supply including; a current regulator for providing a constant current to the telephone set independent of the central office line, the current regulator operable with an input voltage supply, a voltage reference circuit coupled to the telephone set in cooperation with the current regulator, for enhancing the input voltage supplied to the telephone set independent of the central office line, a voice relay coupled to the current regulator and the voltage reference circuit for switching the connection of the modem and telephone set between the central office line and the current regulator and voltage reference circuit assembly, wherein (1) if the incoming and outgoing call includes data, facsimile, or voice signals or upon a particular identification of an incoming call by the CID relay, the computer commands the voice relay to disconnect the telephone set from the central office line, and (2) for communication of voice signals directly between the telephone set and the modem independent of the central office line, the computer causes the voice relay to connect the modem and telephone set to the power supply. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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Specification