37 results about "ISDN 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.

Systems and methods are described for a download booster for ADSL transmission. A method includes extending a digital subscriber loop including: coupling a telephone company central office to a customer premises via the digital subscriber loop; filtering a downstream digital subscriber loop signal at the customer premises; and amplifying the downstream digital subscriber loop signal at the customer premises. A method, includes: providing a digital subscriber loop service to a customer premises that is coupled to a telephone central office via a digital subscriber loop line; filtering a downstream digital subscriber loop signal at the customer premises; and amplifying the downstream digital subscriber loop signal at the customer premises. A method, includes extending a digital subscriber loop including: coupling a telephone company central office to a customer premises via the digital subscriber loop; filtering an upstream digital subscriber loop signal at the customer premises; and isolating the upstream digital subscriber loop signal at the customer premises. A method, comprises: providing a digital subscriber loop service to a customer premises that is coupled to a telephone central office via a digital subscriber loop line; filtering an upstream digital subscriber loop signal at the customer premises; and isolating the upstream digital subscriber loop signal at the customer premises. An apparatus includes a download booster coupled to a digital subscriber loop line and a customer premises modem.

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 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.

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.

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 digital user data transmission device and a method; the transmission method includes that in the upstream link, A. the DSL track signals from different user ports are received; the DSL track signals are demodulated to user data sequentially; B. the user data packets are encapsulated according to the source port information; C. the encapsulated user data packets are transmitted through the serial data link according to the preset rules; in the downstream link, a. the encapsulated user data packets transmitted through the serial data link are received; the user data in the user data packets are recovered; b. the user data are modulated to the DSL track signals and transmitted to the corresponding user ports. When the digital user data transmission device and the method are adopted for DSL data transmission, the data from a plurality of user ports can be loaded on a serial data link; thereby, when the number of users is fixed, the number of buses occupied by the user ports can be reduced so that the bandwidth is saved and the distribution of buses is convenient.

The invention relates to a noise measurement method and related equipment for noise measurement in a digital subscriber line transmission system. The system includes a sending DSL modem and a receiving DSL modem, wherein the sending DSL modem is connected to the receiving DSL modem by a communication line. The method of the present invention includes the step of receiving, at the receiving digital subscriber line modem, symbols transmitted by the transmitting modem. The receiving DSL modem then demaps the received symbols onto constellation points. The receiving DSL modem then performs noise measurements based on the differences between the received symbols and the determined constellation points. Further, the frequency of the incorrectly demapped symbol is determined by the receiving DSL modem, and the frequency of the incorrectly demapped symbol is then used by the receiving DSL modem to correct the noise measurement.

Methods and apparatus to qualify a wire-pair for a digital subscriber line (DSL) service are disclosed. An example method comprises modifying a digital subscriber line (DSL) signal received on a wire-pair at a DSL modem to emulate an environmental condition, and qualifying the wire-pair for a DSL service based on a DSL connection rate achieved by the DSL modem during the emulated environmental condition.

Relatively low cost asymmetric digital subscriber line (ADSL) service and auxiliary POTS service are delivered over extended distances (e.g., at least 20–25 kft), by a hybrid ADSL-SDSL architecture insertable between central office and remote sites of an ADSL system. Central office and remote site transceivers employ trellis coded pulse amplitude modulation and a data rate that conforms with the signal transport capability of an extended distance symmetric DSL (SDSL) loop, while providing a 64K POTS channel. The central office and remote site transceivers controllably insert idle asynchronous transfer mode (ATM) cells in upstream and downstream ADSL channels to compensate for timing differences with ADSL equipment.

The invention relates to a method and a system for testing performances of DSL (digital subscriber line) access equipment and the DSL access equipment. The method comprises the following steps of adding an NSLookup module on a CWMP (CPE Wan Management Protocol), sending an NSlookup command to the DSL access equipment through a communication line on a TR069 platform, and determining the network connectivity of the DSL access equipment according to the response information sent back by the DSL access equipment. The method, the system and the DSL access equipment have the beneficial effects that a method for detecting the network connectivity of the DSL access equipment is added into a DSL access network environment, so a network management person can select the detection method in a flexible and diversified way, the convenience is provided for the management of the network equipment, and the management efficiency is improved; and meanwhile, the mutual lookup of a domain name or an IP (internet protocol) address can be realized on a remote TR069 platform, so the convenience is provided for the lookup of the domain name or the IP address.

An apparatus for and method of encapsulating Ethernet frame data in Very high speed Digital Subscriber Line (VDSL) frames. The VDSL frames are transmitted over a point to point VDSL link where they are subsequently extracted and forwarded as standard Ethernet frames. The VDSL facility transport system comprises an Ethernet to VDSL Consumer Premises Equipment (CPE) coupled to a DSL Access Multiplexor (DSLAM) over a VDSL transport facility. The Ethernet to VDSL CPE functions to receive a 10BaseT Ethernet signal and encapsulate the Ethernet frame into a VDSL frame for transmission over the VDSL facility. The DSLAM is adapted to receive VDSL frames, extract Ethernet frames therefrom and generate and output a standard Ethernet signal. Ethernet frames are encapsulated within VDSL frames and transmitted on the wire pair without regard to the state of the SOC signals. This overcomes the problems associated with syncing the transmission of the Ethernet data with the SOC signals. The present invention also provides a method of providing the receiving station an indication of the start of a VDSL frame. A preamble having certain desirable characteristics such as good autocorrelation properties, is used by the receiving station to identify the start of a VDSL frame. To further ensure that a detected start of frame is valid, the length field of the VDSL frame is examined for a legal length value.

The present invention discloses a transceiver of digital subscriber line (DSL) which supports a variety of DSL systems, comprising: a transmission circuit for receiving an output signal and generating a first DSL transmission signal or a second DSL transmission signal according to the output signal under the control of a transmission selection parameter; a hybrid circuit for generating a line transmission signal according to the first or second DSL transmission signal and generating a DSL reception signal according to a line reception signal; and a reception circuit for generating a first DSL reception signal or a second DSL reception signal according to the DSL reception signal, and then outputting one of the first and second DSL reception signals as an input signal according to a reception selection parameter.