Abstract: Systems and methods consistent with the present invention include a peripheral device connected to a telecommunications network via a telephone line and connected to a multimedia network via a high-speed serial interface. The peripheral device establishes and maintains multiple logical connections between devices in the multimedia network and devices in the telecommunications network.

Abstract: Subscriber loop systems often contain bridged taps which may interfere with the transmission of DSL signals. The bridged tap creates at least one local minimum at a notch frequency in the frequency response of the subscriber loop within the frequency range of the DSL signals. Effects of the bridged tap on a subscriber loop are reduced by terminating the bridged tap with a bridged tap canceller. The bridged tap canceller has at least one filter element for each local minimum created by the bridged tap. Each filter element provides substantially complete reflection of DSL signals at the corresponding notch frequency.

Abstract: A method and apparatus are provided for suspending or freezing outputs from an isolation barrier system, which may be a digital capacitive isolation barrier system, during the occurrence of events that may disrupt proper operation of the system. Examples of such disruptive events are data rate changes during modem baud rate negotiations, transition to low-power mode, and going off-hook in a telephony system. In each of these cases, the master circuit anticipates the disruption and sends a freeze signal to the isolated circuit. The freeze signal instructs the isolated circuit to enter freeze mode, and no data is sent through the isolation system. Internal control signals are generated and used to establish synchronization and framing after the disruption, and to restore normal operation of the isolation system. In preferred embodiments, the duration of the freeze period may be determined by a timer or by circuitry that detects framing lock or the presence of transients in the system.

Abstract: An improved modem architecture and associated method are disclosed that integrate modem functionality and line-side isolation functionality while allowing control of modem processing so that it may be bypassed if raw data, such as raw pulse-code-modulated (PCM) data, is desired to be transmitted or received.

Abstract: A method and apparatus for distributing protocol processing among a plurality of computing platforms. Data communications equipment such as Remote Access Devices, Communication Servers, Terminal Servers, and Dial-up Routers provide single user or large-scale multiple user communication access to various computing environments. The equipment costs and performance of such access equipment is related to the amount of CPU processing capability and memory required to support the desired number of serial communication links. It is common to use protocols that terminate in their entirely in the same processing machine. This invention encompasses methods developed to increase the cost/performance capabilities of the communication equipment that supports these serial links, primarily by means of distributing the protocol processing for higher level protocols across multiple computing platforms, including devices such as modems. Examples of such higher level protocols include PPP, SLIP and RTP.

Abstract: An integrated line card for providing an analog termination for both POTS and xDSL signals that present the appropriate impedances at xDSL frequencies for the xDSL signals and appropriate impedances at POTS frequencies for POTS signals. The line card comprises a front end for coupling combined POTS and xDSL transceiver circuits to a telephone line at a single termination and an impedance generator responsive to the frequency range of the POTS and the xDSL circuits for generating the appropriate impedances on the line at xDSL frequencies for xDSL signals and the appropriate impedances at POTS frequencies for POTS signals, such that the signals are coupled to the card without the use of a splitter. Preferably, the xDSL circuits and the POTS circuits share a common driver for driving signals onto the loop. An advantage of this arrangement is that the two circuits may be designed together thus ensuring out-of-band noise generated by either source does not interfere with the other.

Abstract: A central site communication system selectively establishes a data connection between a remote system and one of group of host systems as a function of information about the remote system. The communication system can be connected to a digital data network such as via an ISDN or T1 network connection and the remote system can be connected to either the digital data network directly or through a Public Switch Telephone Network (PSTN) analog connection. The host system can be connect to the communication system via a LAN medium and utilize an IP network and a data tunneling protocol to establish a data connection between the remote system and the host system. The information about the remote system can include the telephone number of the remote system, the telephone number dialed by the remote system to connect with host system, the protocol used by the remote system or the data transmitted by the remote system to the host system.

Abstract: A device for protecting a modem against harmful telephone line signals or reversed polarity telephone line signals includes a telephone line interface couplable to a telephone line, a modem interface couplable to a modem communication port, a measurement circuit that measures the value of an electrical parameter of a signal on the telephone line, an indicator circuit that provides an indication if the value of the parameter is not within predetermined limits, an isolation circuit that electrically isolates the modem communication port from the telephone line if the value of the parameter is not within predetermined limits, and a polarity detection circuit that determines the polarity of the telephone line with respect to the polarity of the modem communication port and reverses the polarities with respect to one another if they are opposite. Such operation of the apparatus may be initiated automatically in response to detection of an off-hook condition of the modem.

Abstract: The present invention provides a method and interface for browsing the internet using a telephone circuit having keys for generating DTMF codes. The interface includes a memory and a processor and is coupled to the telephone circuit and display. The interface receives a first DTMF code requesting access to the internet and, in response to the first DTMF code, loads a Web browser in its memory. The interface then receives a second DTMF code from the telephone circuit and converts the second DTMF code into a Web browser command using an interpretation protocol. The Web browser command is then executed using the interface, thereby enabling a user to access the internet via manual operation of the keys of the telephone is circuit.

Abstract: A network interface circuit includes an off-hook/on-hook circuit, responsive to the communications network, that provides an off-hook voltage substantially equal to the communications network voltage in an off-hook state and that provides an on-hook voltage in an on-hook state. A voltage controlled current source provides a load current which is proportional to a communications network voltage provided by the communications network. A divider circuit, responsive to the off-hook/on-hook circuit, provides an input voltage and produces an over-voltage, wherein the input voltage is proportional to off-hook or on-hook voltage. A clamping circuit limits the input voltage to one of a first or second predetermined value based on the operating mode and generates a current limited voltage.

Abstract: The present invention provides a method and system for transmitting a digital message from a source to one or more receiving devices. After the digital message is received from the source, the one or more receiving devices are selected from a list of addressable receiving devices and the digital message is routed through a local area network until the digital message can be transmitted to the one or more receiving devices. The digital message is then transmitted to the one or more receiving devices using a single wireless transmission. Alternatively, the present invention provides a method and system for transmitting a digital message from a source to one or more destinations. After the digital message is received from the source, the digital message is transmitted over a wireless communications link to each of the one or more destinations, if any, that has a device for receiving the digital message over the wireless communications link.

Abstract: A method and system for redirecting long distance telephone transmissions makes use of computer hardware and software to run a network that allows transmission of telephonic messages, such as facsimile messages or alarm system related messages, through a wide area computer network, such as the Internet. The system includes, for example, one or more routers and a centralized communications center server. A telephonic message directed to an intended destination is received by the system, which sends the message over the network to the centralized communications center server. The server automatically directs the message according to the intended destination over the network.

Abstract: A circuit for permitting communication between stations of a local area network connected to a central office wherein interference such as the dial tone from the central office is eliminated during station to station communication. The modem of a first station has a data processor which analyzes a number dialed at the first station. When the number is intended for a second station who is a network member, the central station is disconnected from the first station and line current is supplied by a current generator local to the first station. The signal is transmitted from the first to the second station by capacitive coupling. A telephone pickup is made at the second station and when the incoming call is from the first station, then line current to the second station is received from a current generator local to the second station and not from the central station thereby eliminating dial tone.

Abstract: An optocoupled line circuit is arranged with a diode bridge providing uniform direction current flow so as to eliminate the mechanical switch hook contact of the prior art. A zener diode is used to bridge a clipped version of AC ringing current across the optocoupler when the circuit is in the on-hook condition. Current presented to the optocoupler from a line control device allows current to flow from the telephone line through the line interface circuit.

Abstract: A telephone annunciator is disclosed which includes a voice ROM with a prerecorded message which is played back in response to a call received from an unwanted caller. A line current modulator is coupled with the voice ROM and the telephone line. A DTMF tone decoder circuit is coupled with the telephone line for decoding at least one DTMF code signal for producing a trigger signal. An on/off control circuit is responsive to the trigger signal for turning on the voice ROM whereby the telephone line current is modulated by the modulator in accordance with the audio signal from the voice ROM. A start-up power supply includes a storage capacitor and stores a charge in response to a ring signal on the telephone line. A main power supply is connected with the telephone line to receive power therefrom when an off-hook signal is detected.

Abstract: A telephone docking station for a personal digital assistant provides a simple docking arrangement in conjunction with a basic telephone circuit that exploits all of the resident intelligence of a PDA in connection with the telephone circuit to extend the PDA's functionality to the telephone, while extending the telephone's communications capability to the PDA. The docking arrangement preferably consists of a docking slot or port provided within the telephone housing itself by which the PDA is readily received and secured to the telephone, and by which an electrical interconnection or infrared (i.e. digital) is made to the telephone circuitry within the telephone housing. Software installed on the PDA implements desired communications functions, such as automatic dialing of a phone number stored in the PDA directory, the receipt and transmission of email, provides the ability to access electronic networks, such as the Internet, e.g.

Abstract: A multi-line modem interface circuit includes a processor and a sensing circuit coupled to the processor. The sensing circuit is operable to identify a status of one or more external lines and communicate the status to the processor. A control circuit is coupled to the processor, and the processor is operable to automatically configure a line connection configuration for either incoming or outgoing voice or data communications in accordance with programmed, user-defined preferences associated with the processor. The interface circuit is operable to automatically monitor a line to determine if it's ringing, determine whether it's allowed and couple the line to the modem for potential answer. The interface circuit line monitoring is non-invasive and keeps the modem from interfering with calls in progress.

Abstract: An automated message filing system includes a teletype machine having an input for receiving data and at least one port member for enabling a bidirectional transfer of the received data. A computer is also provided having at least one port member for enabling a bidirectional transfer of data, a display, and a data storage area. A converter links the at least one port of the teletype machine with the at least one port of the computer, the converter enabling conversion of teletype data to computer data. Accordingly, data received by the teletype machine is converted by the converter into data readable and storable by the computer.

Abstract: Subscriber loops often contain bridged taps which may interfere with the transmission of DSL signals. A bridged tap terminator provides high tap impedance for POTS signals, low insertion loss for DSL signals, and impedance matching for DSL signals when connected to the bridged tap.

Abstract: A relay is described to facilitate communication through the telephone system between deaf people and hearing people. To overcome the speed limitations inherent in typing, the call assistant at the relay does not type most words but, instead, re-voices the words spoken by the hearing person into a computer operating a voice recognition software package trained to the voice of that call assistant. The conversation-type flow of communications achieved by this type of relay enables the design of a new class of interpreters for the deaf.

Abstract: Terminals having analog/digital telephone functions as well as data exchange functions are used by users who are of lower skill level than the average user of a personal computer. Therefore, a system comprising such a terminal should be as self-supporting and independent as possible, which can be realized by providing either at least the access provider/server provider or at least the terminal with a self-triggering mechanism for triggering said system for exchanging data via a connection between said terminal and said access means. Then the system itself can establish that for example new information has arrived or new software should be installed, and then for example make said connection and exchange the data.

Abstract: A combination x digital subscriber line (xDSL) and analog modem including a computer bus interface, codecs, an analog front end (AFE) for xDSL communications coupled to a plain old telephone service (POTS) line and a direct access arrangement (DAA) for analog communications also coupled to the POTS line. The modem is designed on a peripheral component interconnect (PCI) card. Generally, ±12, 5 and 3.3 volts are available for PCI components. Traditionally, the AFEs for non-PCI modems were designed to operate on ±12 volts for differential POTS line driving. For differential POTS line driving, the AFE typically requires a regulated voltage. However, ±12 volts supplied to PCI cards are typically not as well regulated as the 5 and 3.3 volts, and therefore the ±12 volts is generally unsuitable for PCI modem AFE design. Furthermore, in computers that operate in different power management modes, ±12 volts may not be available to the PCI card while 5 and/or 3.

Abstract: A method and apparatus to identify/process dynamically telephony data over each of a set of channels. A system has one or more ports providing a set of channels for transfer of various types of (telephony) data (e.g., voice, fax, data modem, video teleconferencing, etc.). Upon detection of a data transfer request (e.g., a “call”) on one or more channels, the system dynamically identifies the type of data as voice, fax, data modem, etc., on the channel(s) and executes appropriate routines to process and route the data.

Abstract: A communications link for data communication via satellite includes interface apparatus comprising a satellite link interface for connection to a satellite link and a PSTN interface for connection to a PSTN. The interface apparatus supports different data compression modes in the communication link. Mode A allows data compression over the PSTN but not over the satellite link. Mode B allows data compression over the PSTN and over the satellite link, but enables decompression and recompression of data flowing in each direction through the interface apparatus. Mode C allows compressed data to pass transparently between the PSTN and the satellite link, while the interface apparatus performs error correction on the satellite link and on the PSTN.

Abstract: There is disclosed a system and method of providing electrical isolation between a telephone line and a connected device, such as a computer. In one embodiment the telephone line is 2-wire and the connected device is 4-wire and includes a feedback elimination circuit. A pair of controlled CTR opto diodes are used in the communication path to effect electrical isolation. The opto diodes are used in conjunction with an electronic inductor constructed using a pair of cascoded darlington transistors to control the telephone line voltage and current and the circuit is designed to maintain the optocouplers within their linear operating range.

Abstract: A radio access system connects a public switched telephone network and a subscriber unit. The subscriber unit includes a first detection part detecting a telematique signal; and a first control part transmitting a detection signal of the telematique signal on a control channel and transmitting the telematique signal on a traffic channel while bypassing a first speech coding-and-decoding part. The radio access system includes a second control part, provided between a radio base station and the public switched telephone network, transmitting the telematique signal on the traffic channel toward the public switched telephone network while bypassing a second speech coding-and-decoding part when the detection signal of the telematique signal is transmitted on the control channel.

Abstract: A system that provides video signal communication between a source of the video signal and a plurality of units that include destinations of the video signal includes an interface coupled to the source and to telephone lines, each of which serves at least one of the units and carries voice signals to and from one or more telephones coupled to the telephone line at said unit. The interface receives the video signal from the source, and transmits the received video signal onto at least one of the telephone lines in a selected frequency range that is different from frequencies at which the voice signals are carried on that telephone line. This causes the video signal to be coupled to a receiver which is connected to the telephone line at the unit served by that line and is adapted to recover the video signal from the telephone line and apply it to one or more of the destinations at the unit. The source is a cable (e.g.

Abstract: A device of the present invention is a personal digital assistance device for communicating with another device via a telephone line which includes: a connection section for connecting the personal digital assistance device to the telephone line; a communication section for dialing a telephone number of the other device for communication with the other device via the telephone line to which the personal digital assistance device is connected by the connection section, for transferring data between the devices, and for disconnecting the telephone line; a control section for controlling the communication section; a voltage detection section for detecting a voltage of the telephone line to which the personal digital assistance device is connected by the connection section; and a determination section for determining whether the voltage detected by the voltage detection section is equal to or greater than a predetermined voltage.

Abstract: The present invention provides apparatus and method for automatic number identification (ANI) for a data access arrangement (DAA) of a modem. Modems or telephones equipped with an ANI system use the caller ID (ANI) signals to identify the calling telephone or modem. For automatic number identification, the invention uses a new switch element on the secondary winding side of a transformer and a standard DAA circuit on the primary winding side of the transformer. The invention does not require an additional AC coupling path for the caller ID (ANI) signals. During an ANI operation, the new ANI switch on the secondary winding side is opened so that the impedance looking into the modem from the telephone line side becomes relatively high and the prior art voltage divide effect is eliminated or reduced.