130 results about "Asymmetric digital subscriber line" patented technology

A method and system include receiving at a provisioning server a service order to implement an asynchronous digital subscriber line (DSL) service from a service order entry system. The provisioning server identifies and assigns multiple facilities needed to implement the service order, including a remote terminal connectable to a terminal of a DSL subscriber and an optical concentrator device connectable to the remote terminal. The provisioning server determines an interface corresponding to each of the facilities, which are configured, based on interface specific instructions from the provisioning server, to implement the service order.

A variety of bi-directional data transmission systems that facilitate communications between a plurality of remote units (15) and a central unit (10) using a frame based discrete multi-carrier transmission scheme are disclosed. In each of the systems, frames transmitted from the plurality of remote units (15) are synchronized at the central unit (10). A variety of novel modem arrangements and methods for coordinating communications between a plurality of remote units (15) and a central unit (10) to facilitate multi-point-to-point transmission are disclosed. The invention has application in a wide variety of data transmission schemes including Asymmetric Digital Subscriber Line systems that includes the transmission of signals over twisted pair, fiber and / or hybrid telephone lines, cable systems that includes the transmission of signals over a coaxial cable, and digital cellular television systems that include the transmission of radio signals.

Systems and methods are described for asymmetric digital subscriber loops. A method includes utilizing a circuit having a first end and a second end, the circuit having a first amplification interface connecting the first end to the second end in a first direction, and a second amplification interface connecting the second end to the first end in a second direction; adapting the first amplification interface to provide a first gain adjustment as a function of a first attenuation of a first communication by a first direction impedance from the transmission medium while transmitting in the first direction, the first communication within a first frequency range over the transmission medium from the first end to the second end; and adapting the second amplification interface to provide a second gain adjustment as a function of a second attenuation of a second communication by a second direction impedance from the transmission medium while transmitting in the second direction, the second communication within a second frequency range over the transmission medium from the second end to said first end. An apparatus includes a modulator for transmitting a first communication, in a first direction over a transmission medium, the modulator operably coupled to a first amplification interface for providing a first gain adjustment, based on a first attenuation of the first communication in the first direction by a first direction impedance of the transmission medium; and a demodulator operably coupled to the modulator, for receiving a second communication, in a second direction over the transmission medium, the demodulator operably coupled to a second amplification interface for providing a second gain adjustment, based on a second attenuation of the second communication in the second direction by a second direction impedance of the transmission medium.

A digital access arrangement for (i) isolating downstream components from twisted pair copper wire and (ii) separating upstream and downstream communications channels. The line isolation is performed with relatively small, lightweight components, such as an optical isolation unit for example, and can be operated with signals modulated at relatively high frequencies and having relatively high data rates and amplitudes.

A receiver for improving the performance of conventional Discrete Multitone Modulation (DMT) based Asymmetric Digital Subscriber Line (ADSL) modems, in the presence of noise and / or interference. A demodulator having an FFT followed by a single-tap-per-bin frequency-domain equalizer is augmented by an additional data-path utilizing windowing or pulse shaping. Windowing is done independently for each symbol over the orthogonality interval and efficiently in the time domain or frequency domain. A decision feedback equalizer at the output of the windowed data-path cancels inter-bin-interference created by windowing.

A digital subscriber link data network incorporates a throughput test server (TTS) to provide fault identification, isolation, and verification of DSL service availability and data rates. An asymmetric digital subscriber line (ADSL) terminal unit—remote (ATU-R) is connected to an ADSL terminal unit—central office (ATU-C) over a conventional copper loop or equivalent. Data connectivity via a packet switch provides access to high speed data networks, TTS connectivity and interfaces to service providers (SPS). Upon receiving a test request, a technician routes a customer to the TTS. The customer uses a web browser to access the TTS and download executable testing software, e.g., a JAVA applet. The applet causes test messages to be sent to and received from the TTS and computes upstream and downstream data rates that is displayed to the customer together with whether the measured data rates are consistent with a specified class of service.

In a coding system for asymmetric digital subscriber line (ADSL) communications, a method of encoding a sequence of information bits is provided comprising the steps of dividing the information bits into encoding bits and parallel bits; encoding the encoding bits to produce encoded bits; mapping the encoded bits and the parallel bits into first and second pulse amplitude modulation (PAM) signals; and generating a quadrature amplitude modulation (QAM) signal from these first and second PAM signals. This method overcomes the decoder complexity that would otherwise be required due to the large QAM constellations involved for ADSL communications.

Systems and methods are described for asymmetric digital subscriber loops. A method includes utilizing a circuit having a first end and a second end, the circuit having a first amplification interface connecting the first end to the second end in a first direction, and a second amplification interface connecting the second end to the first end in a second direction; adapting the first amplification interface to provide a first gain adjustment as a function of a first attenuation of a first communication by a first direction impedance from the transmission medium while transmitting in the first direction, the first communication within a first frequency range over the transmission medium from the first end to the second end; and adapting the second amplification interface to provide a second gain adjustment as a function of a second attenuation of a second communication by a second direction impedance from the transmission medium while transmitting in the second direction, the second communication within a second frequency range over the transmission medium from the second end to said first end. An apparatus includes a modulator for transmitting a first communication, in a first direction over a transmission medium, the modulator operably coupled to a first amplification interface for providing a first gain adjustment, based on a first attenuation of the first communication in the first direction by a first direction impedance of the transmission medium; and a demodulator operably coupled to the modulator, for receiving a second communication, in a second direction over the transmission medium, the demodulator operably coupled to a second amplification interface for providing a second gain adjustment, based on a second attenuation of the second communication in the second direction by a second direction impedance of the transmission medium.

A variety of bi-directional data transmission systems that facilitate communications between a plurality of remote units (15) and a central unit (10) using a frame based discrete multi-carrier transmission scheme are disclosed. In each of the systems, frames transmitted from the plurality of remote units (15) are synchronized at the central unit (10). A variety of novel modem arrangements and methods for coordinating communications between a plurality of remote units (15) and a central unit (10) to facilitate multi-point-to-point transmission are disclosed. The invention has application in a wide variety of data transmission schemes including Asymmetric Digital Subscriber Line systems that includes the transmission of signals over twisted pair, fiber and / or hybrid telephone lines, cable systems that includes the transmission of signals over a coaxial cable, and digital cellular television systems that include the transmission of radio signals.

A modulation / demodulation device for communicating signals in ADSL network. The modulation device includes a unit for generating a control signal based on a predetermined data, and a unit for determining the control signal based on the amounts of the low rate signal and the high rate signal, a unit for receiving a low rate signal and for generating a low rate signal sequence having a first controlled number of bits, based on the control signal, a unit for receiving a high rate signal through terminals LSx and ASx and for generating a high rate signal sequence having a second controlled number of bits, based on the control signal, and a unit for modulating the low rate signal sequence and the high rate signal sequence and for coupling modulated low rate signal sequence and modulated high rate signal sequence, thereby generating a transmission signal.

A system and methods to optimize the resource planning of ADSL services is provided. In an illustrative implementation, a network management system (NMS) communicates with an ADSL network to provision resources for participating users. The provisioning process yields a permanent virtual circuit (PVC). Included in the provisioning process is the creation and management of configuration variables, such as, the virtual path identifier (VPI) and the virtual circuit identifier (VCI). The VPI / VCI combination uniquely identifies each PVC. If the provisioning process is aborted or fails, it may be reanimated by the NMS using the VPI / VCI combination. In this implementation, the VPI may be set to a constant value and the VCI value calculated using ADSL configuration values (e.g. the physical connection position on a first, second, third, etc. ADSL network component.) The deterministic nature of the VPI and VCI configuration variables assist the NMS to track and optimize available resources.

The invention discloses a smart park video conference system. The smart park video conference system comprises a conference server, a conference terminal which is connected with the conference serverthrough an ADLS (Asymmetric Digital Subscriber Line), a conference terminal which is connected with the conference server through a 3G / WIFI (3rd Generation / Wireless Fidelity) network, a conference terminal which is connected with the conference server through a 3G network card, a conference terminal which is connected with the conference server through a local area network, and a conference terminal which is connected with the conference server through an optical fiber network. The video conference system can provide different types of application modes and different types of login manners fora user. The video conference system has an audio function, a video function, a data collaboration function, a mobile smart terminal access function, a conference chairman control function, a system extension service function and a system management function. Through adoption of the smart park video conference system, a comprehensive and universal multimedia communication platform is provided forthe user, and different types of application modes are provided for the user through proper selection of audio / video hardware and external equipment and reasonable utilization of conference bandwidthresources.

A variety of bidirectional data transmission systems that facilitate communications between a plurality of remote units (15) and a central unit (10) using a frame based discrete multi-carrier transmission scheme are disclosed. In each of the systems, frames transmitted from the plurality of remote units (15) are synchronized at the central unit (10). A variety of novel modem arrangements and methods for coordinating communications between a plurality of remote units (15) and a central unit (10) to facilitate multi-point-to-point transmission are disclosed. The invention has application in a wide variety of data transmission schemes including Asymmetric Digital Subscriber Line systems that includes the transmission of signals over twisted pair, fiber and / or hybrid telephone lines, cable systems that includes the transmission of signals over a coaxial cable, and digital cellular television systems that include the transmission of radio signals.

The present invention relates to the payment system for using the wireless network and its method, the payment system comprises a wireless device with a SIM card; a wireless AP (access point), an ADSL (Asymmetric Digital Subscriber Line), a Web-SIM gateway, a web authentication server, an accounting authorization server, a HLR (Home Location Register) and a PSTN (Public Switched Telephone Network). When a user employs the wireless network to connect to Internet via the wireless AP, an ADSL, a Web-SIM gateway and a web authentication server, the user must be identified by a payment and identity system constituting of the accounting authorization server, the HLR and the PSTN to connect to Internet and trade in Internet

A PPPoA (point-to-point (PPP) over asynchronous transfer mode (ATM)) spoofing function utilizing an asymmetric digital subscriber line (ADSL) modem to form a single network between a client PC and a network access server (NAS) by allowing the ADSL modem to make a PPP connection to the NAS when the client PC is booted, by allowing the NAS to transmit Internet protocol (IP) configuration information, including a global IP address, to a DHCP server of the ADSL modem through a PPP Internet Protocol control protocol (IPCP), and by allowing the ADSL to transfer the IP configuration information received from the NAS to the client PC, thereby forming a bridge by the ADSL modem between the client PC and the NAS to enable IP packets to be transferred between the client PC and the NAS.

The present invention provides asymmetric digital subscriber line (ADSL) modems including a discrete multitone (DMT) modem module. The DMT modem module includes a digital signal processor (DSP) configured to process control signals for initializing the ADSL modem during installation associated with a host device and transmit the processed control signals to a host controller of the host device.

A line driver couples a data transceiver to a transmission line having a load impedance Z via a transformer with a turns ratio of 1:n, the data transceiver transmitting signals in a first frequency range and receiving signals in a second frequency range different from the first frequency range. The line driver includes an input port for receiving an input signal voltage, an output port for supplying an output signal voltage to the transformer, and a differential amplifier having a low pass filter for amplifying the input signal voltage and outputting an amplified signal voltage. The line driver further includes termination resistors having a resistance Rt, where Rt=Z2⁢n2×k(0<k≤1),and a positive feedback path for coupling the output signal voltage from the output port to an appropriate node of the differential amplifier so that a synthesized output impedance substantially matches the load impedance Z over the second frequency range.

A fixed broadband wireless data access service providing shared wide-band packet-switched data transport for high speed data access in areas where conventional ADSL service and fiber optic service are unavailable. The wireless data access service is a point-to-multipoint cellular-type network that connects customers to data service providers through the ATM backbone of an existing network. Customers connect to the ATM backbone and data service provider through a cellular grid in which a wireless base station in each cell communicates with the individual customer wireless equipment within its cell site coverage area. The base stations are connected to an ATM backbone switch through wireless and wireline backhaul links. The upstream and downstream bandwidths of the wireless broadband network are engineered in various symmetric and asymmetric configurations to provide a shared packet-switched connection that emulates an uninterrupted, direct wireline ADSL connection. The wireless broadband network employs a data protocol of shared access bandwidth and adaptive asymmetric data rates to support multiuser service sessions by wireless transmission. The wireless broadband network is not network protocol specific and can be applied to wireless asymmetric digital subscriber line service, wireless integrated service digital network over digital subscriber line service, wireless very high bit rate digital subscriber line service, or wireless symmetric or single-line digital subscriber line service.

A method for saving power on a digital subscriber line (xDSL) includes: generating a statistic on data rates on the xDSL, adjusting the line rate and the transmit power on the xDSL according to the statistic result, and updating the line rate of an xDSL transceiver according to the adjusted line rate and transmit power. An apparatus for saving power on an xDSL includes a data rate statistics unit, a line rate adjustment policy unit, a line parameter adjusting unit, and a line rate updating unit for an xDSL transceiver. According to the embodiments of the present invention the average transmit power of the xDSL line can be reduced effectively and energy can be saved.

An approach for processing data received from a communications channel that minimizes noise power and optimizes impulse response length to reduce interference, such as from inter-symbol interference (ISI) and inter-channel interference (ICI), is disclosed. For example, finite impulse response (FIR) filtering may be used with FIR coefficients that are determined by optimizing a function of the impulse response length and the noise power. The impulse response length is optimized based on the communications channel transfer function to reduce interference. The noise power is minimized based on the noise covariance as determined using the total noise power density. The approach accounts for noise from a variety of interference sources besides ISI and ICI. The result is a superior equalizer for use in communications receivers employing orthogonal frequency division multiplexing or discrete multitone modulation in communications protocols employing Asymmetric Digital Subscriber Line, G.Lite and Very High Bit Rate DSL.

The invention relates to a thermal control device for prepaying with a noncontact-type smart IC card, mounted in a thermal power station of a civil central heating system. The device mainly comprises a shell and components in the shell, i.e. a power supply, a contact-type operation controller, a noncontact-type smart IC card reader, public communication network modules of CDMA (Code Division Multiple Access) / GPRS (General Packet Radio Service) / ADSL (Asymmetric Digital Subscriber Line), and the like, an RS (Recommended Standard) 485 MOD-BUS communication module, an M-BUS heat meter communication module, a multi-branch electric valve control module, a multi-branch electric valve state detection module, and the like. By the device, the prepaying functions of the IC card for central heating, the storage of paying data, transaction records, heat consumption data, and the like can be realized. The device is used for collecting a heat meter according with an M-BUS communication standard protocol, transmitting partial data to local other smart equipment through an RS 485 interface and transmitting the information of the real-time data, the transaction records, the heat consumption data, and the like to an upper management system through communication interfaces of the public communication networks of CDMA / GPRS / ADSL, and the like so that heat supply enterprises can acknowledge the heat consumption requirements and the transaction conditions of heat users in time, and the modern management levels of the heat supply enterprises are improved.

A system for determining the transmit power of a communication device operating on a twisted pair subscriber line includes a communication server coupled to a first subscriber line and a second subscriber line. The communication server comprises a communication device that communicates a signal using the first subscriber line. A memory coupled to the communication server stores noise information and cross-channel-coupling information for the first subscriber line and the second subscriber line. A processor coupled to the memory determines the transmit power of the communication device based upon the noise information and the cross-channel-coupling information.

A method and system for discarding and regenerating transmission control protocol (TCP) acknowledgment packets (ACKs) transmitted over an asymmetrical digital subscriber line (ADSL) to increase the data transmission rate. When an incoming ACK is received at a first intermediate node located at one end of the ADSL link, the intermediate node determines whether a prior ACK from the same connection / flow (TCP receiver) is presently stored in a queue awaiting transmission. If a prior ACK packet is not presently stored in the queue, the incoming ACK packet is stored in the queue. However, if there is a prior ACK packet in the queue, the information contained in the incoming ACK packet is stored in a per-connection state table and the incoming ACK packet is discarded. When the prior ACK packet is ready to be transmitted to a second intermediate node via the ADSL link, the information contained in the per-connection state table regarding the discarded incoming ACK is copied into the prior ACK. Upon receiving the prior ACK, the second intermediate node regenerates the discarded ACK based on the information contained in the prior ACK.

A system for diagnosing failures of ADSL comprises an access module for locating and monitoring the subscriber lines providing the ADSL services, a plurality of ADSL test devices each having various extension test boards corresponding to the test kinds detected for the failures of the subscriber lines accessed by the access module, and a control device for controlling the ADSL test devices. Preferably, extension boards may be additionally provided to adapt for increase of the number of the subscribers.

A PPPoA (point-to-point (PPP) over asynchronous transfer mode (ATM)) spoofing function utilizing an asymmetric digital subscriber line (ADSL) modem to form a single network between a client PC and a network access server (NAS) by allowing the ADSL modem to make a PPP connection to the NAS when the client PC is booted, by allowing the NAS to transmit Internet protocol (IP) configuration information, including a global IP address, to a DHCP server of the ADSL modem through a PPP Internet Protocol control protocol (IPCP), and by allowing the ADSL to transfer the IP configuration information received from the NAS to the client PC, thereby forming a bridge by the ADSL modem between the client PC and the NAS to enable IP packets to be transferred between the client PC and the NAS.

The invention provides a tax-controlled safety module for realizing fully-online tax invoicing, wherein an anti-counterfeiting code-generating module is adopted by the safety module for anti-counterfeiting code generation and data encryption and decryption, so that the safety, the authenticity and the integrality of related invoicing data are ensured. A clock chip is placed inside, so that the accuracy of the invoicing time is ensured; a 3G (3rd-Generation) wireless short-message module and a dispatching program are placed inside, the seamless dispatching in many online modes, such as ADSL (Asymmetric Digital Subscriber Line), 3G, short massages and the like can be realized by the dispatching program, and the 7*24-hour real-time fully-online tax invoicing is realized; and considering the seldom-occurring condition that an invoice can not be provided for a consumer due to the problem occurrence of three online invoicing passages, an off-line invoicing passage is provided by the safety module. A two-dimensional code-generating module is placed inside, so that the generation of invoice-surface two-dimensional codes is realized, and the rapid identification of a tax authority is facilitated. The identity of a taxpayer is authenticated through a CA (Certificate Authority) certificate. Generated anti-counterfeiting codes can be verified to ensure the authenticity of the invoice.

The embodiment of the invention refers to a digital subscriber line signal processing method and apparatus and a digital subscriber line system. The line signal processing method comprises the steps that frame symbols to be sent are employed to carry data to be sent; in the obtained frame to be sent of the data to be sent, the number of left symbols of the data to be sent is not carried; in the frame to be sent carried by the data to be sent, the number information of the left symbols are added, the frame carried with the data to be sent and added with the number information of the left symbols are sent. According to the embodiment, the frame to be sent is added with the number information of the left symbols of the data to be sent to make a receiver obtain the information that not carries the left symbols of the data to be sent and not process the left symbols, which can save signal processing power in a TDD DSL system, reduce power consumption and save energy for the TDD DSL system.

The invention discloses a method for solving the loss of ADSL MODEM software. The method is as follows: the flash storage area in the MODEM is divided into three areas: the boot sector, the application program sector and the general data sector, and then the MODEM to be upgraded After the software structure of the upgrade package is optimized, write the optimized data into the above three areas respectively. When the device needs to be completely upgraded, set the boot sector and application sector to readable and writable states to perform software upgrades. After the upgrade process is over, it will return to the default read-only state; when the device needs to be upgraded generally, set the application sector to readable and writable state, and then restore the sector to the default read-only state after the application upgrade is completed Status; for general data sectors, their read and write attributes are set to readable and writable to ensure normal read and write operations of the device. The invention reduces the risk of losing the MODEM startup software and improves the reliability of the equipment.