Abstract: A method for channel estimation includes: loading a combination of signals sent on other lines over a line of a channel; measuring a signal-to-noise ratio (SNR) of the loaded line; and calculating crosstalk channels of the loaded line according to a coefficient of the combination of signals sent on other lines and the measured SNR. Accordingly, a device and system for channel estimation are provided. The technical solution of the present invention may be used for relevant systems such as an x Digital Subscriber Line (xDSL) system.

Abstract: A modem for handling notifications received over a network is disclosed. In one embodiment, the modem includes a first interface to connect to a network, a second interface to connect to a host processor on a terminal and a modem processor to receive presence configuration information from the host processor and in response thereto transmit a request comprising the presence configuration information to a presence information store. The modem processor further arranged to receive one or more notifications with presence information from the store based on the presence configuration information in the request. The presence information supplied to the store by one or more further terminals associated with one or more users. The modem processor stores the one or more notifications in a storage means, and in response to receiving a request for presence information from said host processor, supply presence information thereto based on the one or more notifications.

Abstract: A dual modem device is provided. The dual modem device includes a first processor for communicating with a first network and a second processor for communicating with a second network and the second processor includes a host module for controlling the first processor. The first processor includes a first processor side IPC (Inter-Processor Communication) for transceiving signals with the second processor and the second processor further includes a second processor side IPC for transceiving signals with the first processor. The second processor transfers a suspend message to the first processor for shifting to a suspend mode and configures the second processor side IPC to not work. The first processor receives the operating suspend message, transfers a suspend response message to the second processor and configures the first processor side IPC to not work.

Abstract: Measures for use in processing data in a user equipment radio receiver, the radio receiver comprising a modem adapted for wireless communication with a telecommunications network. Data associated with wireless communication conducted via the modem is received, the received data being defined in a first domain. The received data is transformed from the first domain into a second domain using a transform function to generate transformed data in the second domain. The transformed data is compressed in the second domain to produce compressed data in the second domain. The compressed data is stored in memory in the user equipment radio receiver.

Abstract: The invention relates to a cryptographic method of authentication using a decoding of an error correcting code on the basis of a public matrix, in which the public matrix is a quasi-cyclic matrix. The invention pertains also to a cryptographic device comprising computation means arranged so as to implement this method. The invention makes it possible to reduce the amount of public data to be stored in a cryptographic authentication method using a decoding of an error correcting code on the basis of a public matrix.

Abstract: Residual FEXT resulting from intended and/or inherent partial cancellation of crosstalk in vectored DSL systems impairs upstream power back-off (UPBO) as traditionally implemented. By considering and taking into account the effects of residual crosstalk on vectored DSL system performance and operation, improved data rates and/or other vectored DSL system performance are realized through the use of UPBO parameters generated for a given residual FEXT environment.

Abstract: A distributed antenna system includes a master unit including a downlink RF input operable to receive an RF input signal from a downlink port of a base station, a first optical port, and a second optical port. The distributed antenna system also includes a first remote unit coupled to the first optical port. The first remote unit comprises a downlink antenna port and a first uplink antenna port and a second remote unit coupled to the second optical port of the master unit. The second remote unit comprises a downlink antenna port and a second uplink antenna port. The master unit is operable to transmit a first RF signal associated with the first RF uplink signal to a first uplink port of the base station and transmit a second RF signal associated with the second RF uplink signal to a second uplink port of the base station.

Abstract: A method and apparatus for self-testing of a radio frequency (RF) chipset is provided. The method requires that a set of test instructions be loaded into a software load station. Once the software is loaded, reference calibration is conducted with test equipment connected. After calibration, the test equipment is disconnected and self-testing of a transmit chain begins. A pre-determined load value is connected and the self-testing process routes a signal from the RF chipset internal modem through a power amplifier, duplexer, first coupler, switch, second coupler, and RF integrated circuit (IC). The apparatus includes a RF chipset that has an internal modem and signal generator as well as processors for processing self-testing of a transmit chain, self-testing of a primary receiver, and self-testing of a diversity receiver chain.

Abstract: A modem for handling notifications received over a network is disclosed. In one embodiment, the modem includes a first interface to connect to a network, a second interface to connect to a host processor on a terminal and a modem processor to receive presence configuration information from the host processor and in response thereto transmit a request comprising the presence configuration information to a presence information store. The modem processor further arranged to receive one or more notifications with presence information from the store based on the presence configuration information in the request. The presence information supplied to the store by one or more further terminals associated with one or more users. The modem processor stores the one or more notifications in a storage means, and in response to receiving a request for presence information from said host processor, supply presence information thereto based on the one or more notifications.

Abstract: A modem is disclosed. An embodiment thereof includes: a first interface arranged to connect to a network, a second interface arranged to connect to a host processor on the terminal, an audio interface arranged to connect to an audio processing means and a processing unit arranged to receive a plurality of parameters from the terminal via the second interface. The plurality of parameters are associated with a call established by the host processor to at least one further terminal connected to the network; wherein the processing unit is further arranged to receive input voice data from the audio processing means, process the input voice data in dependence on at least one of said parameters; and transmit the processed input voice data via the first interface to the at least one further terminal over said network during the call in dependence on a further at least one of said parameters.

Abstract: In a modular signal mirroring system each point-to-point RF transceiver end has a controller module coupled to one or more I/O modules. The I/O modules have various input and output circuits. A signal received at the near end is reconstructed at the far end after being transmitted in an RF packet. The reconstructed signal may be the same as the input signal, inverted from the input signal or level-shifted from the input signal. It is representative of the input signal following the input signal's state after a time-quantization latency. Transmission between the two ends is via a periodic transmission controlled in a master slave protocol. If a transmission is not received in a timely manner or, in some systems, if intentional interference with transmissions is detected, the reconstructed signal is forced to a safe state determined by local switch settings. The settings include the last known good state.

Abstract: A secure demand paging (SDP) system includes a dynamic random access memory (DRAM), a microprocessor having a secure internal memory and coupled to said DRAM, and a non-volatile memory storing a representation of operations accessible by the microprocessor. The stored representation of operations includes a coded physical representation of operations to configure an SDP space in the DRAM, to organize the SDP space into virtual machine contexts, to organize at least one of the virtual machine contexts into block book keeping blocks and book keeping spaces in the block book keeping blocks, and to execute a secure demand paging process between said secure internal memory and said DRAM.

Abstract: A burst processing modem. Implementations may include a receive side including a channelizer adapted to process a plurality of channels and write a plurality of frames to a receive RAM array. A receive frame state machine may be adapted to generate a timing signal using a burst time plan for the plurality of frames. A demodulator may be coupled with the receive RAM array and adapted to read from the receive RAM array only the one or more bursts from the plurality of frames indicated by the timing signal. A transmit side may include a modulator coupled with a transmit frame state machine, with a transmit RAM array, and a combiner bank. The combiner bank may read the modulated plurality of channels from the transmit RAM array and assemble a plurality of frames using a timing signal generated from a burst time plan by the transmit frame state machine.

Abstract: A method and apparatus are disclosed comprising a combined open loop/closed loop uplink power control scheme for E-UTRA. The combined open and closed loop method for UL intra-cell PC controls the wireless transmit receive unit (WTRU) transmit power spectral density (PSD), PSDTx, (e.g. power per RB).

Abstract: Provided is an electric product. The electric product includes: a communication modem including a printed circuit board; a first communication unit installed at the printed circuit board and performing communication by using a first communication type; and a second communication unit installed at the printed circuit board and performing communication by using a second communication type different from the first communication type; a control unit transmitting/receiving a signal to/from the communication modem; and a load receiving power and controlled by the control unit; wherein the first communication unit and the second communication unit are installed at different corners of the printed circuit board.

Abstract: Embodiments of methods, apparatuses, and systems for preprocessing a transmit signal of a transceiver are disclosed. One method includes estimating parameters of a communication link between the transceiver and a link partner transceiver, estimating cross-talk coupling of the transceiver to at least one other transceiver, and adjusting at least one of a transmit power or a transmit signal waveform based on the estimated parameters and estimated cross-talk. One apparatus includes a transceiver that is operative to obtain parameters of a communication link between the transceiver and a link partner transceiver, and to obtain a representation of cross-talk coupling of the transceiver to at least one other transceiver. Further, a controller of the transceiver is operative to adjust at least one of a transmit power level or a transmit signal waveform based on the estimated parameters and estimated cross-talk.

Abstract: Embodiments of methods, apparatuses and systems for transceiver processing are disclosed. One method includes a transceiver receiving a data stream from a link partner transceiver. A link parameter of a link between the transceiver and the link partner transceiver is determined. Allocation of transceiver processing between high-latency processing and low-latency processing is based at least in part on the link parameter.

Abstract: Methods, systems, and apparatus can be used to prioritize channel scanning. In various implementations, a nonvolatile memory on a CPE device can store downstream channels that a CPE device previously identified as being used by a headend. In some implementations, the nonvolatile memory can be organized or arranged such that DOCSIS 3.0 channels receive preference upon initialization. In other implementations, the selection of the channels from nonvolatile memory can be prioritized to select DOCSIS 3.0 channels over other types of channels.

Abstract: A frequency response signal transmitting device for frequency response measurement includes: a first oscillator unit configured to generate a clock signal; a clock and data recovery (CDR) unit configured to remove a jitter component of the clock signal; a pulse signal generation unit configured to receive an output signal of the CDR unit and generate a pulse signal repeated at a predetermined period; and an optical signal transmission unit configured to receive the output signal of the CDR unit and apply the received signal to an optical cable.

Abstract: A network infrastructure for mobile machines which are usable in explosive areas, having inherently safe participants and not inherently safe network participants the latter being arranged in pressure-resistant housings. The machine has at least one controller for actuating at least one not inherently safe participant. In order to provide a network infrastructure which avoids the drawbacks of the prior art, the machine has, outside the pressure-resistant housing for the first controller, at least one second, inherently safe controller for actuating at least one inherently safe participant, wherein the first controller forms a data distributor for a plurality of not inherently safe participants and the second controller forms a data distributor for a plurality of inherently safe participants, and wherein the first data distributor and the second data distributor are linked via an electrically decoupled data communication link.

Abstract: The present invention provides a method and an apparatus for generating secondary synchronization signals, wherein the method comprises steps of: determining a value of iteration times M according to a total number N of cell ID groups or a cell ID group index NID(1), wherein M is a natural number; calculating to obtain M cyclic shift accumulation parameters qk (k=0, 1 . . . M?1) through M times of iterations; calculating a common cyclic shift factor m? through q0; calculating a first cyclic shift value m0 and a second cyclic shift value m1 according to m?; and generating the secondary synchronization signals according to m0 and m1. The present invention solves the problem that the method for generating the secondary synchronization signals in related arts cannot support a greater number of cell ID groups.

Abstract: Disclosed is a transmission apparatus, a radio communication apparatus, and a transmission method for making it possible to obtain stable characteristics by controlling the difference of time between an amplitude signal and a phase signal to an optimal point, without depending on a modulated signal nor making the circuit size larger. A multiplier (170) generates, in a pseudo manner, a digital modulated signal corresponding to a signal that is obtained by performing analog to digital conversion on a modulated signal that is generated by an amplitude modulator (140), by multiplying a digital amplitude signal that is obtained by performing analog to digital conversion on an amplitude signal by a digital angle modulated signal corresponding to a signal that is obtained by performing analog to digital conversion on an angle modulated signal.

Abstract: A symbol-timing recovery function of a receiver is provided with a signal combiner (465) coupled to a first receive branch with a first receive signal (10) and to a second receive branch with a second receive signal (20). The signal combiner (465) generates a combined signal (C) on the basis of the first receive signal (10) and the second receive signal (20). Further, a common timing error detector (470C) is provided. The common timing error detector (470C) is coupled to the signal combiner (465) and is configured to generate a common timing error signal (TEC) on the basis of the combined signal. A first digital symbol timing for the first receive signal (10) and a second digital symbol timing for the second receive signal (20) are recovered on the basis of the common timing error signal (TEC).

Abstract: An RC generating unit generates a first ranging code by performing a logical operation to first seed data, repeats a process for generating a second ranging code by performing the logical operation to second seed data generated when generating the first ranging code until generation of a Nth ranging code, stores the 1st through Nth seed data corresponding to the 1st through Nth ranging codes in the memory. And the RC generating unit generates a transmission ranging code, in response to a reception of specification data of a transmission ranging code transmitted from a base station, by performing the logical operation to the seed data corresponding to the specification data.

Abstract: An expansion of known serial data links, for example ETHERNET, published in IEEE802.3, for directly transmitting random events without having to carry out synchronization with a clock signal or having to wait for a cyclical transmission time. Two different, random events are represented using two differently coded individual pulses and are transmitted in an event-controlled manner. A jitter-free latency of 45 ns between the event and its reception is possible over a line length of 8 m, for example. The expansion is particularly suitable for the short, digital data links between a node and a plurality of modules, as are required in modern electrical discharge machines, machine tools and similar electronic systems.

Abstract: Systems and methods can be operable to provide improved load balancing for network devices. In some implementations, such systems and methods can operate to create success list and/or fail list for use in optimizing improved load balancing for network devices. In other implementations, such systems and methods can also operate to manage and remove entries from success list and/or fail list. The success list and/or fail list can be used to optimize load balancing thereby reducing or preventing interruption in service to customers.

Abstract: A diagnostic tool is adapted to include the capability of initiating one or more diagnostic tests, collecting the raw data from the diagnostic test(s) and transporting the raw diagnostic data to an OSS. The OSS interprets the raw diagnostic data and stores the results in a database. The stored results can be searched, sorted, manipulated, analyzed, and the like. The results of any of these operations can then be, for example, displayed to one or more entities such as customer support, network operators, network planners, or the like.

Abstract: A modem (for example, a modem within a cellular telephone) includes a plurality of Wireless Communication System Modem Sub-Circuits (WCSMSCs). Each WCSMSC receives a control signal generated by a corresponding one of a plurality of programmable timers. Each timer receives the same sequence of count values from a wall clock counter. A processor that controls overall modem operation can program a timer to generate a control pulse at a particular count time of the wall clock counter. The processor can also program a timer to generate a periodic control signal. The control signals output from the timers orchestrate when the various WCSMSCs start operating in the processing of a frame. By virtue of the programmability of the timers, the wall clock timer system is programmable to generate customized control signals such that frames of new and different protocols having arbitrary frame structures can be processed by the same modem/timer system.

Abstract: A sampling phase selection method for a data stream is provided, wherein the data stream has a variable data rate in a fixed time period. The method comprises generating a calibration signal, wherein the time interval of the calibration signal is longer than the fixed time period of the data stream, generating a first clock sequence and a subsequent second clock sequence, wherein the first and the second clock sequence are composed of a plurality of continuous clock phases and the number of the clock phases of the first clock sequence are the same as that of the clock phases of the second clock sequence, selecting one of the phases of the first and the second clock sequence, in turn, to provide a sampling phase, performing a plurality of samplings on the data stream to generate a flag signal, and selecting a final sampling phase according to the flag signals with different sampling phases.

Abstract: A method for inter-modem coordination is described. A first data connection to a network in a first network coverage area using a first air interface provided by a first modem is established. The method also includes detecting a second network coverage area with a second air interface provided by a second modem. A data call state of the second modem is determined by the first modem. The first data connection to the network by the first modem is terminated when the data call state of the second modem is no data call. A data call state of the first modem is determined by the second modem. A second data connection to the network using the second air interface provided by the second modem is initiated when the data call state of the first modem is no data call.

Abstract: Embodiments provide solutions to reduce power utilization (either at individual cable modems or in the overall network) in future cable networks. Particularly, embodiments seek to reduce power utilization at individual cable modems and in the overall network, by pre-compensating upstream transmissions according to feedback channel characteristics received from the headend. According to embodiments, pre-compensation is performed using power filtering/amplification and/or bit loading. Pre-compensation can be performed individually per cable modem. Further, pre-compensation can be performed over the entire upstream frequency spectrum and/or over particular sub-hands of the frequency spectrum as appropriate for each cable modem.

Abstract: An apparatus comprising a first transceiver at a central office (CO) coupled to a second transceiver at a customer premise equipment (CPE) via a digital subscriber line (DSL), a crosstalk precoder coupled to the first transceiver at the CO, and a vectoring control entity (VCE) coupled to the transceiver via a feedback channel and to the crosstalk precoder, wherein the second transceiver comprises a noise monitor configured to detect non-crosstalk noise in a downstream signal from the CO to the CPE, and wherein the first transceiver is configured to receive a predefined special feedback signal from the second transceiver that indicates whether non-crosstalk noise is detected in the downstream signal instead of a measured error value.

Abstract: A SerDes data sampling controller that includes a gear shifting data sampling clock that zeroes the data sampling skew at the center of the unit interval during the CDR phase lock stage, and then skews the data sample timing away from the center of the unit interval as the DFE coefficients adapt during the data transfer stage. This allows the controller to implement the best (unskewed) data sample timing during the CDR phase locking stage, and then skew the data sample timing after the DFE coefficients have adapted to provide the best (skewed) data sample timing for data bit sampling during the data transfer stage. The data sampling gear shifter may apply a variable skew value to the transition sampling or quadrature (Q) data sampling clock differentially varying the quadrature (Q) transition sampling clock from the inphase (I) data sampling clock.

Abstract: A system and method are provided for implementing a soft Reed-Solomon (RS) decoding scheme, technique or algorithm to improve physical layer performance in cable modems and cable gateways. At 1024-QAM, a receiver is provided in which a signal to noise ratio is reduced by at least about 1 dB relaxing design considerations and specifications for other components in the system including for the tuner. A soft-RS-symbol generation scheme is provided to enable soft-input RC decoding in a forward error correction (FEC) module connected to a QAM demodulator. The RS decoding scheme is implemented without significantly complicating hardware or processing overhead. A typical receiver hardware requirement in an FEC module to implement the disclosed scheme may be comparatively modest, e.g., on an order of approximately 50K gates.

Abstract: A DSL transmitter and receiver are disclosed that are capable of accurately measuring crosstalk in G.vector-compliant DSL lines resulting from a legacy line. During crosstalk measurement, the legacy line can be placed in a showtime mode. Once in showtime mode, a data signal designated for the legacy line is reduced in power spectrum density and/or spectrum to reduce its effects on crosstalk measurements. An O-P-Vector-1 signal is then superposed on the reduced data signal, and the resulting test signal is transmitted over the legacy line while sync signals are transmitted over neighboring G.vector lines. The receiver can then accurately measure the crosstalk on the neighboring lines, and report back to the transceiver for adjustments. A similar configuration can be performed in a diagnostic mode of the legacy line.

Abstract: A method and a device are provided for transmitting or receiving a clock signal. The method includes the step of transmitting or receiving at least two wave bands via a digital subscriber line, wherein a clock signal is conveyed via one of the at least two wave bands. The clock signal may be used for mobile clock synchronization.

Abstract: In a method for processing unsolicited result codes (URCs) of a communication device, keywords of a URC are extracted when the URC is sent from a modem of the communication device to an operating system of the communication device. A digital code of the keywords is obtained by encoding the extracted keywords. A function of the communication device is executed to process the received URC according to the digital code of the keywords.

Abstract: The ability of clock and data recovery (“CDR”) circuitry on an integrated circuit (“IC”) to handle jitter in a serial data input signal can be tested by using transmitter circuitry on the IC to produce a serial data output signal whose time base has been subjected to modulation. Loop-back circuitry on the IC may be used to apply the serial data output signal to the CDR circuitry as the serial data input signal of the CDR circuitry. Modulation circuitry on the IC may be used to cause the above modulation of the time base of the serial data output signal.

Abstract: Improved diagnostics of transmission line (100) noise are enabled by adapting DSL equipment (110, 120) to make measurements of quiet line noise also in the transmit bands, so that noise can be measured at both ends for the same frequency or frequency bands. An estimate of the point where noise enters the line, as well as an estimate of the noise power at that point can be made from the relationship between the so measured noise levels at both ends of the line.

Abstract: An alternative approach to coping with the ever increasing demand for faster communications hardware is to design modems that are capable of operating its speeds at a higher data rate than a speed required for a single port of the standard communication rate for that modem. Basically, by utilizing a resource manager, that directs the data in and out of the various portions of the modem in an orderly manner, keeping track of which of the ports is being operated at any given point in time, a standard single port modem can be reconfigured, for example, at an over clocked rate, to manipulate the data input and output of a modem.

Abstract: System and method for implementing a link aggregation system, a protection system, and an XPIC application for an all outdoor radios system using a wireless channel operating at a license-free 60 GHz band are provided. The license-free 60 GHz band offers a wide frequency bandwidth that can support a high speed data rate up to 10 Gbps in full duplex mode, frequency reuse, and high security due to its fast oxygen absorption at 60 GHz. As such, a wireless channel operating at the license-free 60 GHz band may be used for a link aggregation system to support wireless local area network (LAN) connections with the speed up to 7 Gbps. In addition, a wireless connection operating at the license-free 60 GHz band may be used to support both XPIC application and protection system for all outdoor radios to achieve a transmission speed of up to 10 Gbps in a full duplex mode.

Abstract: A modem with an expansion module includes a modulation/demodulation module and the expansion module. The modulation/demodulation module is provided to execute modulation and demodulation operations to network signals. The expansion module mainly has a central processing unit, a memory unit, and a signal output port. The memory unit stores an operating system. After the modem is started up, the central processing unit executes the operating system to generate video and audio signals. The modem is externally connected to a display screen via the signal output port, and the video and audio signals are transmitted to the display screen and displayed on the display screen. Accordingly, the modem is used to provide the network connection function for a computer device and also used as a small computer.

Abstract: An analogue modem circuit and carrier recovery method are disclosed for use between an RF receiver and a digital modem circuit configured for receiving a baseband RF input signal, and including an up-converter with frequency supplied by an up-converter voltage controlled oscillator, VCO; a down-converter with frequency supplied by a down-converter VCO; a Costas loop sub-module; and baseband outputs from the down-converter to a digital modem circuit. The up-converter feeds the down-converter, and the Costas loop module performs Costas loop functionality on the output of the down-converter to control the up-converter VCO frequency output to thereby control modification of rotation of symbols of the baseband signal.

Abstract: A system and method of communicating with a modem via a voice channel of a wireless communication system. The method carried out by the system includes the steps of (a) establishing a voice channel connection between a vehicle telematics unit and call center via a wireless cellular network, (b) generating a modem signaling carrier comprising a single frequency tone together with a speech component, (c) sending the modem signaling carrier over the voice channel connection using an EVRC-B vocoder, (d) establishing a data communication session over the voice channel connection in response to the modem signaling carrier, and thereafter (e) carrying out data communications between the vehicle telematics unit and call center during the data communication session.

Abstract: An OFDM system embeds sequence information in the transmitted signal that reduces peak average power ratio (PAP) with minimal impact on the overall system efficiency. A marker is embedded onto the transmitted information that is used to identify the combining (inversion) sequence at the receiver. In one embodiment, selected tones in a cluster are rotated when the corresponding phase factor rotates the cluster.

Abstract: Described herein are systems, apparatuses, and methods relating to a power-saving state or power-saving mode to facilitate clock synchronization between the two transceiver units and/or updating of DSL operation parameters during the power-saving state.

Abstract: A communication device is configured to perform processing of one or more bits to generate a modulation symbol sequence based on one or more profiles that specify variable bit loading of bits per symbol over at least some of the modulation symbols of the modulation symbol sequence. The communication device is also configured to perform interleaving of the modulation symbol sequence to generate OFDM symbol(s). Some modulation symbols within the modulation symbol sequence that are separated by an interleaver depth may be transmitted via adjacently located sub-carriers, while other modulation symbols within the modulation sequence that are separated by more than the interleaver depth may also be transmitted via adjacently located sub-carriers. A communication device may be configured to adapt and switch between different operational parameters used for bit loading, interleaving and/or deinterleaving at different times based on any desired considerations.

Abstract: A communication device is configured to perform interleaving of a modulation symbol sequence to generate an OFDM symbol. Some modulation symbols within the modulation symbol sequence that are separated by an interleaver depth may be transmitted via adjacently located sub-carriers, while other modulation symbols within the modulation sequence that are separated by more than the interleaver depth may also be transmitted via adjacently located sub-carriers. First adjacently located sub-carriers transmit first and second modulation symbols that are separated by the interleaver depth within the modulation sequence while second adjacently located sub-carriers transmit third and fourth modulation symbol that are separated by more than the interleaver depth within the modulation sequence. A communication device may be configured to adapt and switch between different operational parameters used for interleaving and/or deinterleaving at different times based on any desired considerations.

Abstract: A teleconferencing system for voice and data provides interconnections among user sites via a central station. User stations at user sites each alternate operation between a data mode connecting a user computer and modem to a user telephone communication path and a voice mode connecting a telephony circuit to the communication path. The teleconferencing system is adapted for conducting a voice conference over standard telephone lines while allowing simultaneous viewing of data objects such as slides, graphs, or text. A host computer connected to the central station serves as a central repository for storage and retrieval of data objects for use in teleconferences.

Abstract: A master unit and a remote unit is provided for a multiband transmission system for distributing and combining signals of at least one wireless communication network and at least one digital network. A reference frequency generator is arranged in the master unit, the reference frequency generator being designed to clock a master modem for converting the signals of the at least one digital network. The reference frequency signal emitted by the reference frequency signal is restored via a reference frequency receiver and is used for closing a remote modem that is located there for demodulation.