117 results about "Symmetric digital subscriber line" patented technology

A facility transport system for transporting high speed Ethernet data over digital subscriber lines. The system, referred to as 100BaseS, is capable of transmitting 100 Mbps Ethernet over existing copper infrastructure up to distances of approximately 400 meters. The system achieves bit rates from 25 to 100 Mbps in increments of 25 Mbps with each 25 Mbps increment utilizing a separate copper wire pair. Each pair used provides a bidirectional 25 Mbps link with four copper wire pair connections providing 4×25 Mbps downstream channels and 4×25 Mbps upstream channels. The system utilizes framing circuitry to adapt the 100BaseT input data signal to up to four separate output signals. A DSL Ethernet Port card couples the modem to each twisted pair used. Each DSL Ethernet Port card comprises modem transmitter and receiver circuitry for sending and receiving 100BaseS signals onto twisted pair wires. The system utilizes QAM in combination with frequency division multiplexing (FDM) to separate downstream channels from upstream channels and to separate both the downstream and the upstream channels from POTS and ISDN signals.

A method, apparatus, and software for providing lifeline service during power failure affecting Customer Premises Equipment (CPE) in a Digital Subscriber Loop (DSL) arranged to carry voice traffic in band rather than on a separate analogue POTS band. The arrangement provides a reduced service, capable of supporting at least one voice call, to operate during such power failure and, where a single call is in progress during power failure, that call may be maintained during the transition from DSL to analogue POTS lifeline service. Where a call is in progress upon power restoration, the lifeline POTS service may be maintained until completion of the call so as not to interrupt a potential lifeline call.

The present invention relates to a graphical user interface that allows a user to access, maintain, and troubleshoot services over a single digital subscriber line (DSL) through a unified interface. The interface permits the subscriber to simultaneously connect to multiple Internet connections and services.

A method for reducing noise from a non-linear device, such as a telephone, that shares a customer loop with a splitterless Asymmetric Digital Subscriber Line modem. The non-linearity of the device can cause some of the upstream signal to bleed into the downstream signal band. The modem examines the downstream band when it is transmitting fast retrain signals. By comparing the power in the band to a previous value when the modem transmitted upstream at a higher power level, the modem may determine whether to cut back its transmitted power to lessen the noise in the downstream band. In this manner, the method may allow optimal downstream data transfer regardless of what non-linear device shares the customer loop with the ADSL modem.

An access device includes a Multi-protocol Label Switching (MPLS) connection management functional module for establishing a label connection and using the label connection for service transmission. The present invention also discloses a service transmission method, including establishing, in the access device, an external connection with the network side, and getting the received service mapped by the access device to the external label for transmission. A high bandwidth of the access device is ensured by utilizing a simple label switching principal in the MPLS protocol according to this invention; meanwhile, it is possible for the access device to support the access of multiple services, such as those of a Time Division Multiplexing (TDM), an Asynchronous Transfer Mode (ATM), a Fast Ethernet (FE) and an Asymmetric Digital Subscriber Line (ADSL), by utilizing the good service adaptability of the MPLS protocol to effectively increase the utilization rate of the network.

The embodiment of the invention relates to a method and a device for reducing the voltage of an x digital subscriber line (SDL) system and the xDSL system. The method comprises the following steps of: measuring and calculating minimum transmission power required by each port on a service single board according to service parameters configured on the service single board of a control office in the xDSL system, wherein the service parameters comprise a service rate and an excepted signal to noise ratio margin; calculating a voltage drop value required by a line driver for driving each port according to a maximum value in the minimum transmission power required by each port; and configuring the transmission power of each port to be the maximum value in the minimum transmission power required by each port, and reducing the power supply voltage of the line driver by the voltage drop value. The transmission power is measured and calculate to produce a fixed transmission power and power supply voltage reduction template, thereby reducing the energy consumption of the xDSL system and avoiding the phenomenon that the transmission power of each port of the service single board is not limited due to the reduction in the power supply voltage of the line driver (LD) to further cause signal wave absorption.

A splitterless interface between a digital subscriber line (DSL) and the central office equipment that can receive and isolate the low frequency voice data and high frequency digital data from a telephone line. This interface can also mix and transmit low frequency voice data and high frequency digital data onto a telephone line. For POTS band frequencies, a reactive impedance coupled across the two-wire interface of the POTS line card, and serially coupled to the line side of the DSL coupling transformer, has an open state magnitude. The magnitude of the line side windings of the DSL coupling transformer is low at POTS band frequencies. POTS band signal power is therefore delivered to the POTS line card. For DSL band frequencies, the reactive impedance across the two-wire interface of the POTS line card has a closed state magnitude. The POTS line card is therefore essentially short-circuited at DSL band frequencies, and DSL band signal power is delivered to the DSL modem. The frequency band in which the reactive impedance transitions from an open state magnitude to a closed state magnitude corresponds to the frequency band between the POTS frequency band and the DSL frequency band.

A subscriber dynamically selects an Internet protocol (IP) service provider. In response to the selection, a digital subscriber line (DSL) modem establishes a switched virtual circuit (SVC) connection from the subscriber to the selected service provider across an asynchronous transfer mode (ATM) network. After the SVC has been established, the modem formats IP data, received from the subscriber, into ATM cells. The ATM cells are forwarded from the DSL modem, via the SVC, to a router associated with the selected service provider. The router formats the ATM cells into IP packets and forwards the IP packets to the selected service provider. Thus, the subscriber has a dynamically established connection to the selected service provider that can be used for IP traffic.

A Digital Subscriber Line Access Multiplexor (DSLAM) for operation within an access network includes a plurality of digital subscriber line modems for terminating a plurality of corresponding digital subscriber lines and aggregating them for onward connection through the access network. The DSLAM is operable, each time a data connection is established or re-established over one of the digital subscriber lines, to generate line data about the data connection at the DSLAM, to store the line data, to wait a predetermined period of time, to determine if the data connection is still operating successfully since the establishment of the connection without having suffered loss of connection during the predetermined period and then to transmit the line data to a management device 100 which performs dynamic line management based on the data.

The invention relates to a shield machine remote data acquisition system based on an SCADA (Supervisory Control and Data Acquisition) system, and the shield machine remote data acquisition system comprises a PLC (Programmable Logic Controller), a data acquisition server and a router, wherein the data acquisition server collects, controls and monitors each item of real-time data of the shield machine in the PLC in real time; the real-time data is bidirectionally transmitted to a ground WEB publishing server by virtue of one pair of symmetric digital subscriber lines (SDSL) and is monitored; meanwhile, the real-time data is published to a local network by the router and is published to a network after being opened by a router port; and therefore, the operation state of the shield machine is remotely monitored and observed in real time. The shield machine remote data acquisition system disclosed by the invention can be used for monitoring a large quantity of data which almost covers all operation data and IO (Input Output) port state of the shield machine, and technical personnel can be guaranteed to comprehensively analyze the data. WEB publication is realized so as to bring possibility for remotely diagnosing equipment faults and analyzing operation parameters, and a platform is provided for intensively monitoring the construction quality of the project department.

The embodiment of the invention provides a time synchronization method, a time synchronization device and a time synchronization system in a digital subscriber line. The method comprises the following steps that: first equipment reads first time information when receiving a first position on a first symbol, and second equipment reads second time information when sending the first position on the first symbol; the first equipment receives the second time information of the second equipment and calculates the time deviation of the first equipment and the second equipment according to the first time information, the second time information and delay information, wherein the delay information is delay time for sending the symbol from the first equipment to the second equipment; and the first equipment adjusts the time of the first equipment according to the time deviation so as to realize time synchronization. Through the technical scheme, the time synchronization of the digital subscriber line is realized.

The invention relates to a method for automatically optimizing quality of a digital subscriber line (DSL) broadband. The method comprises the following steps: real-time and timing broadband line data collection, accessing into multiplexer DSLAM equipment by using a digital subscriber line, so as to finish data collection, monitoring and service Web request, wherein the invention particularly proposes a post-collection data analysis technology, which mainly provides initial data for line diagnosis and line optimization, line stability judgment, which is used for providing a judgment index for stability optimization; line diagnosis, dividing a broadband line into three standards of a line with speed-up potential, a line free of speed-up potential and a line unable to speed up according to data analysis and preset standard reaching rules; a line optimization process, which is divided into an assignment work order treatment process and an automatic iterative optimization process. The method has the beneficial effects that the condition that maintenance personnel comprehend the concrete reasons of quality decline of the digital subscriber line DSL broadband, carry out targeted door maintenance and remove hidden dangers of the DSL broadband line in advance is facilitated, so that user perception is improved, and customer complaint is reduced.

The embodiment of the invention discloses a circuit of a digital subscriber line. The circuit comprises a line driver, an echo cancellation (EC) module, a transformer module, a first high-pass filter, an impedor and a bypass high-pass filter, wherein the transformer module is a high-pass filter; a receiving channel high-pass filter of the transformer module can receive an uplink signal of AnnexA and a part of signal of an integrated services digital network (ISDN); a transmitting channel high-pass filter of the transformer module can transmit a downlink signal of the AnnexA; the first high-pass filter can transmit the downlink signal of the AnnexA; the bypass high-pass filter filters an ISDN signal in cooperation with the ISDN; and the bypass high-pass filter receives the uplink signal of the AnnexA in cooperation with a plain old telephone service (POTS). The embodiment of the invention also discloses equipment of the digital subscriber line. Due to the adoption of the embodiment, an AnnexA mode and an AnnexB mode can be supported at the same time, and the original POTS service and ISDN service on a copper wire are compatible.

The invention relates to an intelligent home gateway, which comprises a central processing unit CPU, a storage unit, a cable local area network processing circuit, a wireless local area network processing circuit and the like, wherein the storage unit, the cable local area network processing circuit, the wireless local area network processing circuit and the like are connected with the CPU. The home gateway also comprises an ATM processing circuit and an ADSL2+ processing circuit, wherein the ATM processing circuit analyzes data from a copper wire and decomposes the data in an asynchronous transmission mode; and the ADSL2+ signal processing circuit demodulates the data, transmitted by the copper wire, of Internet, converts the data into a digital signal and transmits the digital signal to the CPU for the CPU to uniformly regulate and control the digital signal, and finally the digital signal is converted by the wireless local network processing circuit into a Wi-Fi wireless broadband signal to be broadcast or is processed by the cable local area circuit and transmitted to terminal equipment connected with the interface of the cable local area circuit. The home gateway integrates the functions of an ADSL asymmetric digital subscriber line and Wi-Fi, provides users with an intelligent and flexible home network interface unit, and better serves the users by effectively using the increasingly developed network.

A method and system for dynamically inverting an A symmetric Digital Subscriber Line (ADSL) system. The ADSL system includes a central exchange equipment (CE) connected to a service provider network and a user equipment (UE) connected to a user workstation. The CE and UE are interconnected by a PSTN link. The CE includes an ADSL transceiver and a splitter coupled between the CE transceiver and the PSTN link. The splitter includes a low-pass filter for separating low frequency voice signals from high frequency ADSL signals transmitted from the UE. In accordance with the method of the invention, an invert request message encoded as a tone sequence is generated by the UE and transmitted to the CE over the PSTN link. The tone-encoded invert request is received through the CE splitter low-pass filter and is decoded utilizing a tone decoder communicatively coupled between the CE splitter low-pass filter and the CE transceiver.

The invention relates to an ADSL (Asymmetrical Digital Subscriber Line) dialing process monitoring and intelligent analyzing method which comprises the following steps: acquiring a data link message between an exchanger and a BRAS (Broadband Remote Access Server) by a bypass port monitor image/passive optical splitting mode; identifying, indexing and storing the message of a dialing process; according to rules, analyzing the message of single dialing process, judging whether the dialing is successful or not, judging failure reasons and giving out solving suggestions; and analyzing a single user dialing abnormal alarm; and according to an index condition, querying historical messages, and recalling historical dialing processes. In the method, as key messages which are related to the dialing process and are captured at different positions of a link are monitored, and the key messages are analyzed and judged according to preset message existence, the sequence, the delay and other rules, the errors in the dialing process can be automatically identified, and two-layer and three-layer protocol fault diagnosis between a DSLAM (Digital Subscriber Line Access Multiplexer)/an exchanger and the BRAS can be carried out. According to the method, not only can the errors be actively identified, and the historical fault messages are recalled, but also the abnormal dialing alarm can be conducted .

Methods and apparatus are disclosed for allocating resources in a Digital Subscriber Line network, the network comprising at least one lower-tier digital subscriber line carrying signals according to a first protocol between a transceiver device at a lower-tier network node and a subscriber transceiver device and further comprising at least one higher-tier digital subscriber line carrying signals according to a second protocol between a transceiver device at a higher-tier network node and a subscriber transceiver device, the first protocol permitting signals to be carried at frequencies in a range having a higher upper limit than the second protocol.

The invention discloses a method and equipment for maintaining the operation of x digital subscriber line (xDSL) terminal equipment, relating to the field of communication. The method and the equipment are used for solving the problem that the traditional terminal equipment can not intellectually provide user configuration wizard. The method disclosed by the invention comprises the following steps: when the terminal equipment is inactive, a user visits a network; the terminal equipment intercepts network visiting information of the user and then automatically jumps to a configuration wizard page to finish terminal equipment configuration and fulfill services; and then, when the terminal equipment is active, the user accesses to the network through the terminal equipment. The terminal equipment comprises a unified resource network address interception module, a configuration module and an access module. The terminal equipment disclosed by the invention can intellectually provide user configuration wizard, thereby improving the management of an internet service provider (ISP) on the terminal equipment, simplifying user operation and providing more humanized service for users.