Abstract: Transmission data are transmitted via a radio interface between an analog telephone link and a user apparatus. A base station for a cordless telephone that is connected to the telephone link has a converter that converts the analog signals into digital signals and vice versa. The digital signals are transmitted, in particular according to the DECT standard, via a radio interface between the base station and a mobile station. In the mobile station, the digital signals are decoded, and thus the transmission data are acquired, and vice versa.

Abstract: Selecting a profile for an interface of a network device includes accessing profile sequences, where each profile sequence corresponds to an interface. Each profile sequence includes profiles that provide parameters for communicating data. The following are repeated for a profile sequence for an interface until a link satisfies a sequence criterion or until a last profile of the profile sequence is reached to select a profile for the interface. A current profile is accessed, and a link for the interface is initiated according to the current profile. Whether the link for the interface satisfies the sequence criterion in accordance with the margin set is determined. A next profile of the profile sequence is accessed if the link does not satisfy the sequence criterion in accordance with the margin set, and the current profile is selected if the link satisfies the sequence criterion. Data is communicated according to the selected profile.

Abstract: Selecting a profile for an interface of a network device includes accessing profile sequences, where each profile sequence corresponds to an interface. Each profile sequence includes profiles that provide parameters for communicating data. The following are repeated for a profile sequence for an interface until a link satisfies a sequence criterion or until a last profile of the profile sequence is reached to select a profile for the interface. A current profile is accessed, and a link for the interface is initiated according to the current profile. Whether the link for the interface satisfies the sequence criterion is determined. A next profile of the profile sequence is accessed if the link does not satisfy the sequence criterion, and the current profile is selected if the link satisfies the sequence criterion. Data is communicated according to the selected profile.

Abstract: A faster modem apparatus communicates with customer premise equipment according to a variety of communication protocols. The faster modem apparatus communicates with customer premise equipment comprising an analog soft-modem comprising a codec. A method utilizes an unused portion of the codec operating range to code and decode data signals having frequencies above 4 kHz. The faster modem apparatus also codes and decodes data signals above 4 kHz. The analog soft-modem and the faster modem apparatus transmit and receive coded analog signals at a signal level of greater than ?9 dBm. In one embodiment, the faster modem apparatus is also operative to communicate with additional modems such as dial-up modems and DSL modems. In one embodiment, the faster modem apparatus supports simultaneous voice and data communications.

Abstract: A DTMF generating device for automatically generating DTMF tones corresponding to a predefined phone number comprises a processor, a memory, and a speaker enveloped in a credit card sized casing. The memory has stored therein DTMF tone samples corresponding to the predefined phone number. When a user presses on a portion of the casing, the DTMF tone samples are played by the speaker.

Abstract: The operating characteristics of a network connection are modified to improve connection performance. Operating limits for the connection interface are identified. New gain setting are selected for the connection interface after the connection interface has finished a training session establishing a connection. The new gain setting are used by the connection interface to conduct a new training session. The new gain settings are selected for the connection interface when operating parameters for the connection are within the operating limits.

Abstract: A method and apparatus of transmitting a modulated data over a digital voice network that includes voice compression. The method and apparatus determine whether a voice signal to be transmitted over the network includes a modulated data signal and then encodes or demodulates the modulated data signal and bypasses voice compression when a modulated data signal is detected. The method and apparatus may detect a modulated data signal by detecting the presence of an answer tone and then searching for a plurality of phase reversals having a particular time distance from each other in the voice signal. Once the encoded or demodulated signal is transmitted over the digital voice network, the method and apparatus of the present invention may detect whether the received signal is an encoded data signal or a demodulated data signal. Then the coded data signal may be decoded back into a modulated data signal. Likewise, the demodulated data signal may be modulated back into a modulated data signal.

Abstract: An extended bandwidth HomePNA system uses a transmit spectrum having a greater bandwidth than the bandwidth specified by a HomePNA 2.0 communication standard. The extended bandwidth system of the invention provides for additional copies of a spectrum of a 2 Mbaud training signal for better accuracy in decoding transmitted data by a receiver. In one embodiment, the extended bandwidth is a 12 MHz band centered at 10 MHz, from 4 MHz to 16 MHz. This extended bandwidth allows for three copies of a 4 Mbaud training sequence or six copies of a 2 Mbaud training sequence. The extended bandwidth of the invention is compatible with a HomePNA 2.0 system by providing a training sequence that enables a HomePNA 2.0 receiver in 2 Mbaud mode to train on the transmitted signal and determine that the transmitted signal is not intended for the HomePNA 2.0 receiver in 2 Mbaud mode.

Abstract: A system and method are disclosed to mitigate the interference on DSL due to high frequency components associated with a change in a POTS condition, such as POTS ringing. In response to detecting that a potentially disruptive POTS condition is to about to occur, downstream DSL traffic can be temporarily stopped. The stoppage can include downstream traffic of voice and/or data.

Abstract: POTS splitter design which incorporates a low-pass filter which improves the voice-band return loss characteristics without sacrificing performance with regard to the voice-band insertion loss or the ADSL-band attenuation distortion. This is accomplished by replacing the inductor of the conventional POTS splitter low-pass circuit with a parallel-connected inductor and resistor.

Abstract: The present invention provides a media terminal adaptor having an internal logical interface to permit communication connections to be established between ports of the MTA.

Abstract: In a telephone system where frequency multiplexed analog telephone signals and digital data signals are transmitted over a line, incoming calls are announced to the customer installation by a ringing indication signal having an amplitude between 1 and 30 V RMS, which is much less than the regular ringing and therefore easier to be generated, and moreover having a smoother shape than a rectangular shape. Upon receiving the ringing indication signal, the customer installation locally generates and provides a full ringing signal to a telephone. The amplitude of this local ringing signal is higher than the amplitude of the ringing indication signal, but the line with the digital data signal is isolated from the customer telephone equipment at the time the ringing signal is generated, so as to avoid disturbance of the digital data transmission by the ringing current, which is a source of impulsive noise.

Abstract: A method of handling telephone signals supplied by an analog telephone set and data supplied by a data terminal in a subscriber line circuit of a digital telephone switching system used at least in subregions for data transmission includes directly connecting a telephone set and a data terminal with a modem to the digital telephone switching system through a common analog subscriber line, at least one of subjecting data supplied by the data terminal to a sampling operation at a sampling rate above a sampling rate required for telephone information during analog/digital conversion and coding sampling values representing data supplied by the data terminal according to a linear characteristic during analog/digital conversion, and feeding data originating from and handled by the data terminal directly to a data transmission network. A subscriber line circuit for handling telephone signals supplied by an analog telephone set and data supplied by a data terminal is also provided.

Abstract: A method provides seamless porting of a user telephone number from a first telephone service provider network to a second telephone service provider network. A network interface device is provided that is interconnected to the first telephone service provider network, a second telephone service provider network, and at least one user communications device. The network interface device may be remotely controlled using the second telephone service provider network to transfer the user telephone number from the first network to the second network.

Abstract: A circuit for interfacing a modem in a wireless communication device to a Subscriber Interface Module (SIM) includes a modem controller, a Universal Asynchronous Receiver/Transmitter (UART) connected to the modem controller, a programmable clock circuit adapted to generate a SIM clock and a UART clock independently of one another based on a common clock and a control signal provided to the programmable clock circuit, a reset circuit to generate a SIM reset signal, and a power control circuit to control powering on and off the SIM, all on an integrated circuit chip. The circuit also includes a Bus Interface circuit to interface the modem to the SIM using a common data line.

Abstract: A hybrid circuit models a plurality of attributes of a communication system including a subscriber line coupled to a line interface circuit. The plurality of attributes includes subscriber line impedance, and impedance of a coupling transformer. The attributes are based on other factors, such as whether or not bridge taps exist at or near the line interface circuit on the subscriber line. The plurality of attributes are modeled by a specific arrangement of resistive and capacitive elements to substantially duplicate the collective transforming effects of the attributes on a transmission signal being sent out on the subscriber line. The transmission signal is transformed and provided to an output, where it is subtracted from a composite signal representing a combination of the actual transformed transmission signal and a receive signal. The subtraction yields an isolated receive signal, which is later processed to recover the full receive signal.

Abstract: An integrated circuit is provided to convert an analog telephone signal into a digital format. The integrated circuit includes an analog-digital converter coupled to an averager. Sampled analog values are averaged at intervals and compared to a threshold level to determine a digital value.

Abstract: Systems and methods are provided for communicating data over a subscriber loop using a modem. One such method includes: transmitting data on the loop in a first frequency band; sensing an indication that simultaneous transmission on the loop in a POTS frequency band is imminent; and adjusting transmit power in the first band, in response to the sensing step. One such system includes an input/output connection in communication with the loop, a processor operable in at least two states, a means for sensing demand for simultaneous usage of the loop, and a means for controlling the state. The first state is characterized by a first transmit power spectrum in the first band. The second state is characterized by a second transmit power spectrum in the first band, reduced relative to the first spectrum. Upon sensing demand, the control means causes the processor to operate in the second state.

Abstract: A system and method for coupling multiple home networks includes a first copper wire network, a second copper wire network, and a high pass coupler disposed between the first and second copper wire networks. The high pass coupler is configured to transfer data signals between the first and second copper wire networks, the data signals having frequencies greater than a maximum plain old telephone service signal frequency. Further, the high pass coupler is configured to prevent cross-talk of plain old telephone service, or voice-band, signals between the first and second copper wire networks. The data signals transferred typically include signals in accordance with the Home Phoneline Networking Alliance standard, and may also include broadband Internet access signals. In one embodiment, the high pass coupler is implemented in a residential gateway device.

Abstract: A home networking transmitter (100), receiver (200), station (300), network manager (404), network (400) and method adapted to network devices (344/336/338/346) over phone lines (406) in a home. A bandwidth other than the 4 to 10 MHz band defined in the HomePNA 2.0× specification and a Baud rate higher than 4M baud may be used for communications between a plurality of devices (334/336/338/346). PHY and MAC layers are improved to increase the performance of home phone line networks. Advantages in the PHY layer include numerous higher symbol rates, higher constellations, variable power level, error correcting codes, byte interleaving, ISI-free pulse shape and pre-equalization. Advantages in the MAC layer include managed bandwidth resources allocation, guaranteed quality of service for latency sensitive applications, solicited grants, support to devices with low power consumption and support to device with low processing power.

Abstract: A method and apparatus for a data access arrangement (DAA) which includes a line modulator containing capacitive elements to increase system stability. The invention provides improved stability during system startup and normal system operation. The line modulator is capable of adjusting the AC modulation and the DC termination presented to the telephone line. Capacitive elements are added to the modulator to provide enhanced system stability. The method includes drawing power from the telephone line, modulating the telephone line, sensing a level of distortion through the line modulator, feeding the sensed level of distortion to the line modulator, and using capacitive circuits to provide additional system stability.

Abstract: Method and apparatus for transmitting encoded data and/or voice signals with increased data speed in a communications system using high resolution analog to digital and digital to analog conversions to attain transmission rates higher than 33.6 Kb/s rate limit of V.90 modem is provided.

Abstract: An asymmetric digital subscriber line transceiver unit-card (ATU-C) and a method of controlling the same. The ATU-C includes: a power supply unit; a plurality of modems to be connected to a plurality of asymmetric digital subscriber line transceiver unit-remote (ATU-R) for subscribers; a plurality of power switches for selectively supplying power generated by the power supply unit to the modems; and a microprocessor for controlling the operation of the power switches depending on the connection status between the subscribers and the modems.

Abstract: A method and apparatus for integraling data and telephony services is disclosed Specifically, the device dynamically configures network input and output ports of the device to support connectivity to a varying number of data networks, a varying number of public switched telephone networks, and a varying number of communication devices. The device also dynamnicly adopts broadband access technologies to access the data networks and maintains data interoperability among the data networks, the public switched telephone networks, and the communication devices.

Abstract: A line interface for combining a broad-band XDSL signal and a voice-band telephone signal in a copper duplex cable, where the voice-band signal, over and above the voice signal, carries a DC feed for the user telephone and, during the call phase, also a ring signal. The XDSL signal and the voice signal are coupled to at least one primary winding of a line transformer of which the secondary winding pilots the telephone duplex cable. The secondary winding is not DC-coupled with the duplex cable and the ring and feed signals are injected into the duplex cable by a circuit realized in high-voltage technology and arranged in parallel with the secondary winding. A further inductive winding performs the function of compensating the flow variations induced in the core of the line transformer during the call phase.

Abstract: A communication system is provided with a power supply budget such that portions of a phone line side circuit are powered from the TIP and RING phone lines while using standard electronic devices for the hookswitch circuits and the diode bridge circuit. For example, low voltage converters in the phone line side circuit are powered from the phone line. The low voltage converters operate off a low voltage power supply of approximately 2.5 V or less, more preferably operate off a low voltage power supply of approximately 2.0 V or less, and in one embodiment 1.9 V converters are utilized. In one embodiment, the communication system further includes a capacitive isolation barrier system for isolating the phone line side circuitry.

Abstract: An embedded operations channel (EOC)-based signalling mechanism is incorporated within transceiver interface (U-BR1TE) components of an integrated services digital network (ISDN) telecommunication system, for effecting a relatively fast, warm start reactivation of a previously deactivated extended ISDN link between an ISDN switch and customer premises equipment. In response to the EOC-embedded ‘wake-up the loop’ message, the receiving U-BR1TE card supplies a 10 Khz wake-up tone to its associated termination equipment (either to the NT-1 in the case of a switch-sourced reactivation, or to the ISDN switch in the case of an NT-1 sourced wake-up request), to reestablish the ISDN loop.

Abstract: The present invention relates to a system and method for providing a “lifeline” service to a VoDSL customer despite an electrical power outage or integrated access device failure at the customer premise. A bypass function is implemented in an integrated access device at the customer premise to provide the lifeline service. The bypass function is preferably a relay, which can be automatically activated to provide the lifeline service under various conditions. The bypass relay, working in conjunction with systems in the central office and the regional switching center allows the customer to obtain an active telephone line during power outages or integrated access device failures. Electrical power is also supplied to the customer's premise from the central office, thereby allowing the customer to use a telephone line in the traditional manner. The present invention can further be implemented for any number of customers and telephone lines.

Abstract: A method and apparatus for controlling the DC line current on a telephone line and reducing the amount of error introduced to the system. The error is reduced by compensating for a DC error term introduced by an analog to digital converter having a DC offset. The DC offset is controlled digitally, allowing software to be used to limit the DC error in accordance with predefined parameters. Predefined parameters can be set to accommodate varying country specifications instead of using switches to control resistors and capacitors. In addition, changes in a country's requirements can be accomplished through software, instead of changing components or redesigning a circuit board. The use of software results in increased flexibility by allowing an infinite number of settings via software or software updates, allowing changes to be made quickly and easily throughout the world, and allowing error terms to be accommodated digitally.

Abstract: A device for detecting a predetermined waveform in a received signal and synchronizing the detected waveform to the predetermined waveform is disclosed. The device includes a memory element for storing a reference set of encoded values. The reference set representing an encoded version of the predetermined waveform. An encoder is used to PCM encode the signal to obtain sets of encoded values representing the received signal. A processor calculates the statistical correlation coefficient of the reference set and the signal sets. The processor then determines the maximum statistical correlation coefficient. The predetermined waveform is detected in the signal if the maximum statistical correlation coefficient is greater than or equal to a predetermined threshold value. The device provides a compact, inexpensive, and fast method for detecting a known reference waveform in a received signal.

Abstract: The present invention relates to systems and methods for providing a “lifeline” service to a VoDSL customer despite an electrical power outage or integrated access device failure at the customer premise. A bypass function is implemented in an integrated access device at the customer premise to provide the lifeline service. The bypass function is preferably a relay, which can be automatically activated to provide the lifeline service under various conditions. The bypass relay, working in conjunction with systems in the central office and the regional switching center allows the customer to obtain an active telephone line during power outages or integrated access device failures. Electrical power is also supplied to the customer's premise from the central office, thereby allowing the customer to use a telephone line in the traditional manner. The present invention can further be implemented for any number of customers and telephone lines.

Abstract: A Home Network telephone system and method are provided for backing up user data. The system comprises at least one endpoint to transceive telephone communications. The endpoints can be devices such as telephones or fax machines, for example. The system also comprises a gateway to service and transceive telephone communication with the endpoints. The gateway has a memory to store a copy of user data associated with each endpoint. The gateway stores user data such as telephone directories, calling line ID (CLID) lists, call-logs, and user preferences for organizing the stored data. The gateway can supply the endpoints with an initial start-up configuration of user data, or resupply an endpoint in response to the endpoint losing the copy of the user data stored in its local memory. Each endpoint receives the user data from the gateway and stores a copy of the user data in a local memory.

Abstract: A method and system for transmitting data over loaded twisted pair copper wires using a low frequency offset, differential voltage, on-off keying (OOK) transmission technique are described. According to one embodiment, an analog or digital signal is sent or received and converted, if necessary, into or from serial format onto or out of a loaded twisted pair copper wire. The signal uses an OOK modulated sinusoidal offset signal with an associated differential voltage. A floating reference ground set positive or negative for the differential nature of the transmission may be required. The OOK modulated offset low frequency is being keyed to the floating ground reference that is set to a minimum signal to noise ratio (SNR) level. The SNR level may be set by adjusting the voltage separation between floating ground and the offset of the sinusoidal low frequency wave. The amplitude of the sinusoidal wave may be adjusted to provide increased transmission distance and better SNR.

Abstract: An aural information is expanded correspondingly to a compression system and a compression rate when a receiving signal from a digital telephone circuit is the aural information and a control signal received from the digital telephone circuit indicates that the aural information is compressed. When the control information indicates a stereo system including a right voice system and a left voice system, right and left voices are separated and output. Thus, a stereo communication is realized with an improved tone quality with using a digital telephone set.

Abstract: According to this invention, a digital key telephone system connected to an analog public network NW having a function of transmitting a ringing signal including identification information of a calling line through a subscriber line (CO line), accommodating a plurality of extension lines each connected to a digital key telephone (DKT) 2 or a standard telephone (STT) 4 as an extension terminal, and having a function of switching and connecting the subscriber line to the plurality of extension lines or the extension lines to each other includes a called party storage means storing, in advance, information representing the correlation between the calling line and the extension terminals 2 and 4 as a called terminal. When a ringing signal arrives from the analog communication network NW, calling line identification information (caller ID) contained in the ringing signal is detected by a calling line identification information interface unit (RCIU) 12.

Abstract: A customer premises system having two-wire buses for transmission of digital telephony signals between digital terminal ends of a private branch exchange (PBX) and respective digital end equipment units includes low pass filters coupled to terminal ends of the two-wire buses serving the digital equipment, for isolation of a home PNA signal from the digital end equipment units and the digital terminal ends of the PBX, and a first high pass filter configured for cross coupling the home PNA signal across the two-wire buses. A second high pass filter is used for cross coupling home PNA signals across two-wire (e.g., tip and ring) buses used to connect analog end equipment to analog terminal ends of the PBX.

Abstract: A customer premises system having two-wire buses for transmission of digital telephony signals between a private branch exchange (PBX) and respective end equipment units includes low pass filters coupled to PBX and end equipment unit terminal ends of the two-wire buses, for isolation of a home PNA signal from the end equipment units and the PBX, and a high pass filter configured for cross coupling the home PNA signal across the two-wire buses.

Abstract: A transmitter within a line driver circuit is configured to supply data pulses over existing residential wiring. The transmitter is implemented in a CMOS integrated circuit. The transmitter comprises three stages: a front-end digital/analog convertor (DAC), an intermediate DAC, and a current amplifier. The first stage dictates whether the output signal is in high power mode or low power mode. The intermediate DAC, as the second stage, controls the waveform shape and tunes the edge rate, thereby outputting a positive current signal and a negative current signal. The final stage amplifies these current signals to yield current signals having a desired waveform shape, power mode, and edge rate.

Abstract: A telecommunication system includes a digital switch, a local loop coupling the digital switch to a subscriber location, wherein a segment of the local loop includes copper twisted pair and wherein an asymmetrical digital subscriber line is carried by the local loop, the asymmetrical digital subscriber line including a plurality of data packets capable of carrying a plurality of derived digital telephone lines. The telecommunication system further includes a subscriber unit coupled to the asymmetrical digital subscriber line. The subscriber unit monitors the content of at least one of the plurality of data packets, receives an off-hook signal in response to an action of a user, and initiates a first derived digital telephone line of the plurality of derived digital telephone lines in response to the off-hook signal.

Abstract: In an audio-digital telephone interface system, selective operation prompts a caller with oral instructions to provide: digital control signals, digital data signals (numeric) or audio signals. Inbound and outbound operations are involved and inbound callers are qualified as by automatic number identification (ANI) signals and consumable key operation. A data cell is loaded in accordance with an operating program and the resulting data packet is flagged depending on the presence of audio signals. Data packets are returned to storage, as for subsequent addressing to call up, as to process or cue a caller. The illustrative format receives and organizes order data for goods or services or to isolate a subset or a sub-subset of callers.

Abstract: A telecommunications system includes a customer service terminal having a digital signal-input, a low voltage DC power-input that renders the customer service terminal operative in the absence of an on/off switch, a plurality of analog signal-outputs, and at least one digital signal-output. A digital subscriber line is connected to the digital signal-input, a plurality of analog devices are connected to the plurality of analog signal-outputs, a low voltage DC power supply has its high voltage AC input connected to a high voltage AC power line, and the low voltage DC output of the power supply is connected to the low voltage DC power-input of the customer service terminal. A low voltage rechargeable battery forms a manually-removable portion of the low voltage DC power supply. The battery maintains DC power input to the low voltage DC power-input of the customer service terminal upon failure of the high voltage AC line.

Abstract: A modem utilizing a data access arrangement (DAA) having line side circuitry including a telephone network interface and system side circuitry including a host system interface. The line side circuitry and the system side circuitry are separated by a high voltage isolation barrier. In accordance with the invention, the high voltage isolation barrier and other DAA circuitry are configured such that information may be communicated between the system side circuitry and the line side circuitry in a digital format. In one embodiment of the invention, the high voltage isolation barrier comprises a single capacitor for communicating bidirectional digital data. In another embodiment of the invention, a pair of capacitors are provided in the high voltage isolation barrier, with the digital signals being driven is a differential manner.

Abstract: The invention relates to a method and an apparatus to establish both telephone and digital communication through an interface between a subscriber unit and a Local Exchange on a telecommunication line intended for digital traffic, for instance an ISDN-line. For the telephone communication, the subscriber unit and the Local Exchange are communicating by transmitting packages according to a protocol comprising PSTN speech communication together with at least service functions through an interface between the subscriber unit and the Local Exchange.

Abstract: A circuit for interfacing a modem in a wireless communication device to a Subscriber Interface Module (SIM) includes a modem controller, a Universal Asynchronous Receiver/Transmitter (UART) connected to the modem controller, a programmable clock circuit adapted to generate a SIM clock and a UART clock independently of one another based on a common clock and a control signal provided to the programmable clock circuit, a reset circuit to generate a SIM reset signal, and a power control circuit to control powering on and off the SIM, all on an integrated circuit chip. The circuit also includes a Bus Interface circuit to interface the modem to the SIM using a common data line.

Abstract: A method and apparatus for automatically switching between voice and data communications as directed by a voice and data capable modem via a cable assembly incorporating a switching means for facilitating and inhibiting the routing of voice information to a voice telephone. A voice and data capable modem incorporates the software functionality associated with a voice and data capable protocol with minimal impact to the form factor associated with the modem, To reduce the impact to the form factor associated with integrated modem designs, the switching hardware associated with voice and data capability is incorporated into a cable assembly used to interconnect the voice and data capable modem with the voice telephone. Additional means for identifying the cable assembly as having the requisite switching functionality is also provided.

Abstract: The present invention is generally directed to a telephone handset for testing the transmission quality of a local loop. In accordance with one aspect of the invention, the telephone handset includes a connector configured to connect to the local loop at, for example, a junction box. The invention also includes a low-pass filter circuit electrically interposed between the connector and operational circuitry of the telephone handset. In operation, the low-pass filter is designed to pass (substantially undisturbed) electrical signals within the POTS frequency band from the connector to the operational circuitry. In the same way, the low-pass filter is designed to substantially block the passage of electrical signals above the POTS frequency range. In this way, the low-pass filter blocks the introduction of high frequency signals, which may otherwise generate intermodulation products within the audible range, from reaching the operational circuitry of the testing handset.

Abstract: In order to ensure continuous telephone service to a customer premises served by an ISDN line, without requiring that the customer maintain an additional POTS line as an emergency back-up to the normally used ISDN service, ISDN signalling circuits and network termination interface components are modified, so that, in the event of a loss of power to customer premises digital communications equipment, a communication link between an auxiliary POTS telephone and the normal ISDN communication path to the central office may be established. There need not be any modification of the central office switch, per se, so that the integrity of the ISDN communication path with the central office line card remains unaffected. As a result, the central office equipment can continue to conduct standard ISDN communications with the customer premises equipment, even though the customer is employing a POTS back-up analog phone.

Abstract: A network interface circuit employing differentially driven capacitive couplings across a high voltage isolation boundary and in which a &Sgr;/&Dgr; CODEC is positioned on the line side of the high voltage interface. In this manner, only four wires cross the high voltage boundary, namely differential pairs for transmit data and receive data. The transfer functions for setting AC and DC parameters, such as impedance matching, are provided by digital filters. Further, with the CODEC on the line side of the high voltage isolation interface, the data which crosses the interface is modulated at the &Sgr;/&Dgr; data rate and, thus, capacitive coupling can be used across the high voltage isolation boundary without the loss of DC data.

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.