Abstract: The present invention is a system and method which controls outer loop transmit power for transmission power of an uplink/downlink communication in a spread spectrum time division communication. The system receives a communication from a base station and determines an error rate on the received communication. The system then distinguishes between static and dynamic channels, produces a static adjustment value, and characterizes the dynamic channels to generate a dynamic adjustment value. The target power level is then adjusted by the static and dynamic adjustment values, setting the transmission power level.

Abstract: A repeater, useable for connecting switches in a data communication network, is provided in a distributed and/or modular fashion. The repeater includes a plurality of separate and distinct components or modules connected to or at least partially housed in, the various switches which the repeater modules couple. Preferably, the repeater autodetects and/or autoconfigures some or all aspects of repeater operations, such as detecting and/or configuring appropriate full/half-duplex mode operation or detecting and/or configuring in response to appropriate or approved cable-type connections. The distributed and/or modular repeater facilitates accommodating various switching or repeater needs as a network grows or contracts.

Abstract: A flexible channel architecture supports full-duplex, radio-frequency communication between a base station, such as a PWT or DECT base station, and a group of remote terminals. Communication from the base to the terminals is by way of a radio-frequency carrier having a first frequency, and communication from the terminals to the base is by way of a second radio-frequency carrier having a second frequency. Each carrier is organized to provide an N-timeslot time-division multiple access data stream (N an integer), so that together the two carriers provide a 2N-timeslot system. Within each data frame, data from the base to the terminals is sent on the first carrier during a first half of the frame, and data from the terminals to the base is sent on the second carrier during the remaining half of the frame.

Abstract: An asymmetric modem communications system achieves high speed data transfers through a telephone network that includes both digital and analog communications mediums. In general, the system includes means for concurrently communicating first and second signals, respectively, in opposite directions along the connection between the communications devices and modems for modulating the first and second signals with different modulation techniques. The communications occur in full duplex manner. In a possible implementation, a digital modem is interfaced to a digital network. The digital network is connected with a coder/decoder (codec). The codec is interfaced with a two-wire analog telephone connection, sometimes referred to as a copper loop. The telephone connection is interfaced with an analog modem. Both the digital and analog modems have a transmitter and a receiver.

Abstract: The cable interface unit in accordance with the invention allows use of the same wire in one cable both for base-band transmission of data between telecommunication equipment in full duplex form and also for transmission of an operating voltage (V) from one device to another. In the transmission unit, data is transmitted through a hybrid connection (41) to a cable (23). After the hybrid connection, the operating voltage (V) is also brought to the cable with the aid of a diplexer (44). The hybrid connection separates the arriving data and conducts it to the receiver, where the data is shaped in an analog manner by correcting level distortions and thereupon in the digital signal processing a DECISION is made on what the received symbol is.

Abstract: System-managed duplexing of coupling facility structures. A plurality of instances of coupling facility structures are maintained in a plurality of coupling facilities. Duplexing processing associated with the plurality of instances is managed by one or more operating systems, making many of the steps associated with duplexing transparent to the exploiters of the coupling facility structures. System-managed duplexing provides high availability for coupling facility structure data via a robust recovery mechanism (i.e., duplexing failover).

Abstract: For processing a data flow received on a plurality of different channels, there is provided:

Abstract: A time division duplex using code division multiple access user equipment receives a plurality of data signals in a time slot. Each data signal experiences a similar channel response. The user equipment receives a combined signal over the shared spectrum in a time slot. The combined signal comprises the plurality of data signals. The combined signal is sampled at a multiple of a chip rate of the combined signal. The similar channel response is estimated. A channel response matrix or a channel correlation matrix is constructed based on in part the estimated channel response. A spread data vector is determined based on in part a fast fourier transform (FFT) decomposition of a circulant version of the channel response or channel correlation matrix. The spread data vector is despread to recover data H from the matrix.

Abstract: A system and method for enabling a network switch to transmit queued packets to a device when opened by the device, and thus to utilize the Fibre Channel Arbitrated Loop (FC-AL) in full-duplex mode when possible. The switch may include a plurality of queues each associated with a device on the FC-AL for queuing incoming packets for the device. The switch may determine a next non-empty queue, open the device associated with the queue, and send packets to the device. The device may send packets to the switch concurrently with receiving packets from the switch, thus utilizing the FC-AL in full-duplex mode. When a device opens the switch to transmit packets to the switch, the switch may determine if there are packets for the device in the queue and, if so, send packets to the device concurrently with receiving packets from the device, thus utilizing the FC-AL in full-duplex mode.

Abstract: The cable interface unit in accordance with the invention allows use of the same wire in one cable both for base-band transmission of data between telecommunication equipment in full duplex form and also for transmission of an operating voltage (V) from one device to another. In the transmission unit, data is transmitted through a hybrid connection (41) to a cable (23). After the hybrid connection, the operating voltage (V) is also brought to the cable with the aid of a diplexer (44). The hybrid connection separates the arriving data and conducts it to the receiver, where the data is shaped in an analog manner by correcting level distortions and thereupon in the digital signal processing a DECISION is made on what the received symbol is.

Abstract: A method is provided for transferring message data between stations of a communications network where the network has plurality of interconnected stations with each station having a microprocessor, data storage means for storing message data and a peripheral device providing an interface for the station to facilitate transmission and reception of messages along the network with a predetermined network protocol. The method includes initiating a transaction between the microprocessor and the peripheral device, transferring a command code from the microprocessor to the peripheral device, sending a status signal from the peripheral device to the microprocessor in response to receiving the command code, sending transmission data from the microprocessor to the peripheral device for output to the network, and sending any data stored in the data storage means from the peripheral devices to the microprocessor.

Abstract: The invention provides a composite filter comprising: a single unitary dielectric block having an outer conductor on the external surfaces thereof; a plurality of inner conductors disposed in the dielectric block; a plurality of filters with different frequencies respectively comprising resonators made of at least one of said inner conductor; a first portion of said dielectric block constituting at least one of said filter comprising a first dielectric material; a second portion of said dielectric block constituting the other one of said filter comprising a second dielectric material; and the dielectric constant of said first dielectric material and said second dielectric material being different from each other.

Abstract: A serial intelligent cell (SIC) and a connection topology for local area networks using Electrically-conducting media. A local area network can be configured from a plurality of SIC's interconnected so that all communications between two adjacent SIC's is both point-to-point and bidirectional. Each SIC can be connected to one or more other SIC's to allow redundant communication paths. Communications in different areas of a SIC network are independent of one another, so that, unlike current bus topology and star topology, there is no fundamental limit on the size or extent of a SIC network. Each SIC can optionally be connected to one or more data terminals, computers, telephones, sensors, actuators, etc., to facilitate interconnectivity among such devices.

Abstract: Disclosed is a simplex/duplex switching system which can easily cope with a simplex configuration or a duplex configuration. The simplex/duplex switching system includes a first device for outputting a predetermined frame signal carrying a plurality of time slot signals; and multiple second devices, each of which is paired with another device having the same structure, wherein, when paired second devices serve together as a simplex device, each of the second devices alternately receives the time slot signals included in the predetermined frame signal; and wherein, when paired second devices serve together as a duplex device, both of the second devices receive all of the time slot signals included in the predetermined frame signal.

Abstract: A ceramic composition includes 100 parts by weight of a main component of the formula: xBaO-y{(1−&agr;)Sm2O3-&agr;Nd2O3}-zTiO2, and as secondary components, about 0.3 part by weight or less of a Mn compound in terms of MnO and about 1 part by weight or less of a Ta compound in terms of Ta2O5, wherein 13≦x≦23; 0<y≦12; 75≦z≦83; 0≦&agr;≦1; and x+y+z=100. Further, about 1.5% by mole or less o3f the Ti element is preferably replaced with Zr. The resulting high frequency dielectric ceramic composition has a high relative dielectric constant (∈r) and a high Q value in a microwave region, can control the temperature coefficient of resonant frequency (&tgr;f) in the vicinity of zero (ppm/°C.), and has a satisfactory thermal shock resistance.

Abstract: An asymmetric modem communications system achieves high speed data transfers through a telephone network that includes both digital and analog communications mediums. In general, the system includes means for concurrently communicating first and second signals, respectively, in opposite directions along the connection between the communications devices and modem for modulating the first and second signals with different modulation techniques. The communications occur in full duplex manner. In a possible implementation, a digital modem is interfaced to a digital network. The digital network is connected with a coder/decoder (codec). The codec is interfaced with a two-wire analog telephone connection, sometimes referred to as a copper loop. The telephone connection is interfaced with an analog modem. Both the digital and analog modems have a transmitter and a receiver.

Abstract: A phase varying circuit which varies the phase of the output load of a duplexer is provided between the duplexer and a receiving circuit. The phase varying circuit is controlled according to a frequency channel pair to be used, thereby changing the phase of the output load of the duplexer according to the frequency channel pair to be used.

Abstract: Outgoing multi-media data components are provided in a communication system and method implemented under control of a user interface program. Each of the outgoing multi-media data components includes one or more types of information (e.g., textual information, graphical information, and audio information). Two or more outgoing multi-media data components are combined under control of a local user via input to the user interface program resulting in combined outgoing multi-media mail. At least one of the two or more outgoing multi-media data components is of a type of information different than another of the two or more outgoing multi-media data components. The combined outgoing multi-media mail is provided for communication to a remote location.

Abstract: A frequency estimator for estimating the frequency of a digital input signal (x(k)) includes a phase detection device (2) for determining the phase (&phgr;(k)) of the input signal (x(k)), a differentiator (3) for generating the phase difference (&phgr;diff1(k)) between adjacent samples of the phase (&phgr;(k), &phgr;(k-1)) and a filter (4) for averaging the phase difference (&phgr;diff(k)) and having a trapezoidal pulse response (hM(k)). The trapezoidal pulse response (hM(k)) is generated by superimposing a first triangular pulse response with a second triangular pulse response which is offset in time with respect to the first triangular pulse response.

Abstract: A duplex communication path switching system provided at each of nodes connected by a communication path which is formed of clockwise and counterclockwise transmission lines in a ring network. The duplex communication path switching system includes a checking circuit for checking whether or not each of a plurality of units of the signal received from each of the clockwise transmission line and the counterclockwise transmission line is normal, and a switching circuit for switching the communication path between the clockwise transmission line and the counterclockwise transmission line based on checking results obtained by the checking circuit so that units which are normal are selected from the signals. Each of the plurality of units of the signal has a constant speed and is provided with frame information defined for the signal transmitted through the communication path, the frame information being used to divide the signal into the plurality of units.

Abstract: A high-frequency dielectric ceramic composition comprises a perovskite crystal phase. The composition contains a rare earth element Ln, aluminum, calcium, zinc, M and titanium wherein M is at least one of niobium and tantalum, and is represented by the formula: (1−y)xCaTiaO1+2a−(1−y)(1−x)Ca(Zn⅓M⅔)bO1+2b−yLnAlcO(3+3c)/2 wherein x and y represent molar ratios. The parameters x, y, (1−y)x, a, b, and c satisfy the relationships: 0.56≦x≦0.8, 0.08≦y≦0.18, (1−y)x≦0.65, 0.985≦a≦1.05, 0.9≦b≦1.02, and 0.9≦c≦1.05. Zinc may be partly replaced with magnesium. The composition is suitable for use in high-frequency devices.

Abstract: A communication system is provided with a group registration function, which is capable of setting a group mode with the reduced number of operation, and simply selecting one of full duplex communication and half duplex communication by a rider, as needed. When a power supply switch and a registration switch are turned on simultaneously, member ID registration is executed. When the power supply switch is turned on and then the registration switch is turned on, visitor ID registration is executed. Accordingly, the registration of a group mode can be simplified. After the registration is ended, at the time of turn-off of a visitor conversation switch, full duplex communication is performed among communication devices subjected to member ID registration, and at the time of turn-on of the visitor conversation switch, half duplex communication is performed between the master and all of the slaves.

Abstract: An asymmetric modem communications system achieves high speed data transfers through a telephone network that includes both digital and analog communications mediums. In general, the system includes means for concurrently communicating first and second signals, respectively, in opposite directions along the connection between the communications devices and modems for modulating the first and second signals with different modulation techniques. The communications occur in full duplex manner. In a possible implementation, a digital modem is interfaced to a digital network. The digital network is connected with a coder/decoder (codec). The codec is interfaced with a two-wire analog telephone connection, sometimes referred to as a copper loop. The telephone connection is interfaced with an analog modem. Both the digital and analog modems have a transmitter and a receiver.

Abstract: An apparatus and method for automatically selecting an amount of build-out capacitance to be applied to a hybrid in a telecommunications circuit to balance or substantially balance the hybrid. The apparatus measures voltages of signals being transmitted on telecommunication lines to which the hybrid is coupled, and based on the measured voltages, automatically selects any number of a plurality of capacitive elements to be coupled to the balance port of the hybrid as the build-out capacitance. The apparatus is further controllable to operate in a manual mode in which the capacitive elements to be coupled to the hybrid are manually selected by switches.

Abstract: A transmission direction switching device for a half-duplex communication apparatus includes a data transmission detector connected to a universal asynchronous receiver transmitter (UART) via a sending line and a direction-switching rule executor connected to a half-duplex communication interface driver having a signal subtraction function via a direction control line. The data transmission detector detects any data to be sent and sends the data if such data exists.

Abstract: A method and apparatus is described wherein users distribute communication objects and multimedia applications over a network communication system. The capabilities of the users terminals are established. A control system analyzes the capabilities of the terminals to establish a state in which the terminals will appear. Heuristics are used to establish a channel mode in corresponding terminals, the channel mode optimizes communications associated with the multimedia application between the terminals.

Abstract: A radio for a half-duplex communication system includes a warning circuit for indicating when a transmission of a signal is taking place. The radio includes a transceiver for providing a voice signal, and the warning circuit includes a pulse generator for providing a beacon signal. The voice signal and the beacon signal are combined into a transmitted signal. The warning circuit includes a power splitter for receiving a remote signal from an antenna and for dividing the remote signal into the voice and beacon signals thereof. The power splitter then provides the voice signal to the transceiver. A comparator compares a level of the received beacon signal with a reference and provides an output to an indicator (such as an LED) when the level of the beacon signal is greater than the reference. As such, the indicator illuminates in the presence of a beacon signal.

Abstract: A communication processor sends and receives frames of data and commands. Transmit and receive protocol engine is controlled by host driver software which utilizes predetermined bits to indicate which frame is the last frame in a series of frames. This information is then placed in the transmit frame before it is sent.

Abstract: A supplemental echo suppressor controls the attenuators in a transmit path and receive path to selectively set the attenuations based on the signal received from the far-end and the signal transmitted from the near-end. The attenuation levels are set to allow full-duplex communication. If both ends supply speech signals simultaneously, the attenuation is reduced, increasing the clarity of signals at both ends. Attenuation levels are also set when both ends are idle. If, however, the far-end user is talking and the near-end user is silent, and the echo at the near-end is low, then the attenuation is set high. Signal parameters are generated and monitored to control echo suppression. Suppression attenuation decisions are determined on the basis of normalized power estimates that are normalized to a background power estimate that is indicative of background noise. The power and noise parameters are used to determine engagement and disengagement of the suppressors.

Abstract: A communications system (100) has at least one TDD platform pair (130, 200) operating synchronously using a Time Division Duplex (TDD) frame structure. A TDD platform pair (130, 200) has first communications platform (124) and second communications platform (126) that are coupled (135) together. First communications platform (124) transmits first data during a first frame and receives second data during a second frame. Second communications platform (126) receives third data during the first frame and transmits fourth data during the second frame. At least one TDDSU (110) receives the first data, transmits the second data, transmits the third data, and receive the fourth data. First communications platform (124) has a first coverage area, and the second communications platform (126) has a second coverage area. A dual coverage area exists where the first coverage region overlaps the second coverage region. At least one TDDSU (110) is located within the dual coverage region.

Abstract: Serial data is exchanged in a serial communication circuit comprising an encoder for producing a first pulse signal having a programmable pulse duration which is representative of a data value. A decoder restores the data value from the first pulse signal received from the encoder. A first data line is connected between an output terminal of the encoder and an input terminal of the decoder. A controller programs the pulse duration at the encoder based on the data value, and restores the data value at the decoder based on the first pulse signal duration. A complementary pulse signal is simultaneously transmitted with the first pulse signal on a second data line. Since the serial data transmitted has a duration-encoded single-pulse format, EMI prevention is maximized, and transmission is therefore relatively noise-free. A simple data verification and error detection is also achieved by comparing the received first data signal and complementary data signal.

Abstract: Methods and systems are provided for transmitting a user's data between two computer networks over physically separate telephone line connections which are allocated exclusively to the user. The user's data is placed in data packets, which are multiplexed onto the separate connections and sent concurrently to a demultiplexer. The data packets contain a computer network address such as an Internet protocol address. A dynamic address and sequence table allows the demultiplexer operation to restore the original order of the data after receiving the packets. The set of connections constitutes a virtual “fat pipe” connection through which the user's data is transmitted more rapidly. Additional users may be given their own dedicated “fat pipe” connections.

Abstract: A high frequency composite component is miniaturized and included in a mobile communication apparatus. The high frequency composite component includes a diplexer, a duplexer, and a high frequency switch. The diplexer is defined by first inductors and first capacitors. The duplexer is defined by second inductors and second capacitors, and the high frequency switch is defined by a first diode and a second diode, third inductors, and third capacitors.

Abstract: Ethernet frames are communicated via a telephone line between master and slave modems using half duplex communication of data and control information to avoid collisions, data to be transmitted being buffered in each modem. Different communication modes, involving different transmitted symbol frequencies, modulation methods, and bits per symbol to provide different transmission rates, can be used depending on errors on the line. To reduce signal attenuation and interference both of which increase with increasing frequency, a lowest frequency communication mode is used for transmitting control information when there is no data in the buffer for transmission, whereas a higher transmission rate communication mode is used for transmission of data and control information when the buffer is not empty.

Abstract: This invention relates to duplex and to half duplex transmission schemes and more particularly to the application of such schemes in TDMA and other multiple access environments. In accordance with a first aspect of the invention, there is provided a method of multiplexing signals transmitted by a number of terminals onto a communications link; the link having a capacity less than the total capacity of the terminals; the method including the step of varying the rate of encoding of said signals transmitted by said terminals whereby the bandwidth o the transmitted signals corresponds to the portions allocated to the terminals. In accordance with another aspect of the invention, there is provided a system for the communication of signals in real time over a channel; said system adapted to vary the bandwidth of at least one signal such that the number of signals multiplexed onto said channel can be dynamically varied.

Abstract: A measuring device for the interface of a transmission link with full-duplex transmission in two-wire common band operation includes a device for simulating the interface that allows the signal in the near-to-far direction on the transmission link to be separated from the return signal. To precisely perform jitter measurements on the interface of the transmission link during ongoing transmission using a conventional jitter measuring instrument, the measuring device has a differentiator followed by a comparator connected between a subtractor and the jitter measuring instrument.

Abstract: A Time Division Multiple Access FDD/TDD dual mode system includes a switch having first and second common terminals and first and second terminals. Also included are a TDD demodulation circuit for demodulating a TDD received signal from the first common terminal; a FDD demodulation circuit for demodulating a FDD received signal; and a FDD/TDD modulation circuit for modulating and impressing the modulated signal onto the second common terminal. A FDD transmission band selection circuit is connected to the first terminal, and a TDD transmission-reception band selection circuit is connected to the second terminal. The first common terminal of the switch is connected to the second terminal during TDD reception, whereas the second common terminal is connected to the first terminal during FDD transmission and to the second terminal during TDD transmission.

Abstract: A radiotelephone unit for conducting time division mutiplex receiving includes a two intermediate-frequency filters provided with the same performance, and switches for switching alternately the two intermediate-frequency filters every time when a receive slot is changed. First and third receive slots are associated with one IF filter and second and fourth receive slots are associated with the other IF filter.

Abstract: There is disclosed a voice/data protocol for use with half duplex digital radios. The protocol modifies the X.21 HDLC protocol which is widely employed in the transmission of data for digital radios. The X.21 protocol utilizes a control "C" and an indicate "I" signal. In the steady state in conventional systems, both the C and the I leads are "off". When either a DTE or DCE requires service, the units set their C lead to the "on" condition. The opposite end detects the request for service on the I lead and when communications occur, sets the C lead to the "on" condition. When both the DTE and DCE have send and detected "on" conditions on their C and I leads the circuit transfers to the data transfer state and is ready to proceed to data synchronization. In the present protocol, the C signal is defined as a push-to-talk transmit request to the radio. The I signal is defined as a radio busy. When the I signal is asserted by the radio, the radio is busy transmitting voice, receiving voice or receiving data.

Abstract: A transceiver for performing direct conversion, time division, full duplex, spread spectrum communication using differential binary phase shift modulation comprises: an antenna for respectively transmitting and receiving signals according to a transmission mode and a receiving mode; a time division duplexer, operatively coupled to the antenna, for selecting between the transmission mode and the receiving mode in a given interval, the duplexer using a control signal to switch between the modes; an oscillator for providing an oscillation frequency; a phase shifter, operatively coupled to the oscillator, for shifting the oscillation frequency to a given phase; a first frequency mixer, operatively coupled to the duplexer and the oscillator, for generating a first base band signal by synthesizing the oscillation frequency and a signal received from the antenna through the duplexer in receiving mode; a second frequency mixer, operatively coupled to the duplexer and the phase shifter, for generating a second base ba

Abstract: To prevent the reduction of an S/N ratio of an image signal in the ITU-T Recommendation V.34 half-duplex communication, signal level designation information included in a line probing signal is disregarded or "no signal level attenuation" information is informed to a partner station when the half-duplex communication is conducted.

Abstract: A system and method for establishing communication between a host computer and a peripheral device. The host computer includes logic for associating an attached peripheral device with one of a particular peripheral device type, logic for associating the attached peripheral device with an instance of a software driver executable on the processor, and logic for enabling communication between the attached device and the host after a set period of time after detection of the attachment of the USB device to the at least one port. The software driver is preferably capable of supporting communication between peripheral devices of the associated particular type and the host.

Abstract: The invention provides a data processing system comprising: a CPU; a system memory; a plurality of network interfaces; a CPU bus connected to the system memory and to each of the network interface for initialization and control of the network interfaces by the CPU; an individual DMA bus connected to each of corresponding network interfaces and to the system memory; each of the network interfaces is connectable to an external network, whereby data can be transferred by the data processing system from one network to another using system memory.

Abstract: Method, system and computer program product are provided for adaptively encoding in hardware, software or a combination thereof a sequence of video frames in real-time. A first encoding subsystem is employed to analyze the sequence of video frames to derive information on at least one characteristic thereof, such as motion statistics, non-motion statistics, scene change statistics, or scene fade statistics. The gathered information may comprise either an intraframe characteristic or an interframe characteristic. A second encoding subsystem, coupled to the first encoding subsystem, encodes the sequence of video frames employing at least one controllable parameter. The second encoding subsystem dynamically adapts intraframe or interframe encoding of the sequence of video frames by adjusting the at least one controllable parameter used in the encoding process in response to the derived information from the first encoding subsystem.

Abstract: A data transmission installation includes at least two data processing tenals(Pa,Pb), each equipped with a network interface(Ia,Ib) fro transmitting messages on request, and collecting received messages, a transmission/reception management device(ARC) giving instructions confirming transmission or reception, a test unit for defining a recognized collision, and a unit for resolving collisions, following a recognized collision condition. Each of the data processing terminals includes a multi-directional radio transmission/reception device controlled in accordance with the confirming instructions fro the transmission of messages to be exchanged. In response at least to the start of an instruction confirming transmission, the radio transmission/reception device operates in rapidly alternating transmission/reception, according to a pattern chosen in order to be peculiar to the data processing terminal.

Abstract: An interactive response system includes a central control host system and one or more wireless remote systems geographically separated from the host system and interconnected with the host system through a communication network. Each remote system includes a base unit and a plurality of response units coupled with the base units through a wireless communication link. Each of the response units includes a microphone, a user input device and a control. Audio signals entered through the microphone are communicated over the wireless communication channel to the base unit and over the communication network to the host system. Any inputs entered on the input device are communicated over the wireless communication channel to the base unit. The host system includes an instructor selection device and a display. At least one call list is displayed on the display. The instructor may select characteristics of individuals for inclusion on the call list.

Abstract: An asymmetric network communication system having a packet and an acknowledgment packet suppression system for use in a client-server environment having forward and return channels operating at different speeds and/or under different protocols on the same or different communication media to provide efficient utilization of shared resources. A network manager, such as a hybrid access system, effects transmission of packetized data on a forward (downstream) channel from the host server to multiple client devices coupled with a shared downstream media at 10 or more megabits per second while simultaneously providing selectable multiple lower speeds of operation on shared or dedicated return (upstream) channels from the client devices to the host server depending on bandwidth availability, bandwidth demand, service level authorization, etc. for the return channel.

Abstract: An interface for personal communications systems is described which provides rapid identification of a caller and limited access based on a variety of parameters obtained from caller identification information encoded by the telephone company. The incoming telephone call information is compared to a preprogrammed access matrix to determine if the caller is authorized to access the personal communications system connected to the interface. A telephone call screening method and apparatus which incorporates the encoded caller identification is also described.

Abstract: A full duplex communication processor simultaneously sends and receives frames of data and commands. Separate transmit and receive protocol engines are controlled by separate sequencers. This enables frames of data to be received and transmitted simultaneously without involving a host CPU on a frame-by-frame basis.

Abstract: An asymmetric modem communications system achieves high speed data transfers through a telephone network that includes both digital and analog communications mediums. In general, the system includes means for concurrently communicating first and second signals, respectively, in opposite directions along the connection between the communications devices and modems for modulating the first and second signals with different modulation techniques. The communications occur in full duplex manner. In a possible implementation, a digital modem is interfaced to a digital network. The digital network is connected with a coder/decoder (codec). The codec is interfaced with a two-wire analog telephone connection, sometimes referred to as a copper loop. The telephone connection is interfaced with an analog modem. Both the digital and analog modems have a transmitter and a receiver.