Motorola Corporation

General Bandwidth Inc.

Other

Freescale Semiconductor,inc.

Genband Inc.

Matthew A Pendleton

Mathew A Rybicki

Timothy W Markison

Gary W Grube

Michael R May

Peter R Molnar

Terence L Johnson

Howard E Levin

Peter J Renucci

Anthony H Anconetani

Takao Inoue

Donald L Sparks

Carlos A Greaves

Ronald D Lutz, Jr

A J Paul Carew

Robert H Whitcher

Raymond P Voith

Sujit Sudhaman

Jeffrey P Gleason

Jody H Everett

Steven E Cozart

James W Kimbrow

Jeffrey P Bray

Timothy J Hurd

John M Porter

I Steve Gerson

Robin Wiprud

George D O'Brien, Jr

Milos Milosevic

A network interface device includes a first interface, a power extractor, a transceiver, and a second interface. The first interface receives a signal that includes both power and packetized information. The power extractor extracts the power from the signal and powers the transceiver. The transceiver extracts the packetized information from the signal and communicates the information to a user device using the second interface.

Line-powered network interface device

A method reliably communicates content for multiple subscriber lines via a single physical transmission medium between a telecommunication gateway and equipment at a customer location. In that method, content for two or more subscriber lines of the customer location is received and converted into packetized data for network communications and/or multiplexed to form an added-main-line (AML) signal that includes power. The packetized data or the AML signal is communicated between the customer location and the telecommunication gateway via the single physical transmission medium. External power can be used to extract the content for the two or more subscriber lines from the packetized data in a primary mode of operation, and the power from the AML signal can be used to extract the content for the two or more subscriber lines from the AML signal in a backup mode of operation.

System and method for reliably communicating telecommunication information

A voice gateway () in a telecommunications network () includes a plurality of telephony port modules (). Each telephony port module () receives telephony voice signals from a public switched telephony network (). Each telephony port module () includes one or more digital signal processors () that perform one or more processing functions on the telephony voice signals. A particular telephony port module () may receive a telephony voice signal and use its associated digital signal processor () to process the received telephony voice signal or transfer the received telephony voice signal for processing to any digital signal processor () on any telephony port module (). Telephony signals may also be transferred for processing to digital signal processors () on another voice gateway () in a voice gateway system.

System and method for interfacing telephony voice signals with a broadband access network

A backplane () of a telecommunications chassis includes a pair of controller slots that can receive respective controller modules. The backplane () also has a plurality of module slots that can receive respective telephony modules. Each of the pair of controller slots is connected by a plurality of buses to each of the plurality of module slots. The backplane () provides the ability to place any module type into any of the plurality of module slots.

Backplane architecture for a telecommunications system chassis

A simple fast and robust echo canceller for both synchronous and asynchronous multicarrier transceiver systems. A first residual time domain echo component is separated from a receive signal in a first frame and a second residual time domain echo component is separated from a receive signal in the next consecutive frame. The first and second residual time domain echo components from consecutive frames are combined to obtain a combined residual time domain echo component. The combined residual time domain echo component is used to adaptively update coefficients in a transfer function representing an estimate of the echo channel in the multicarrier transceiver system. The separation of the echo components from the receive signal eliminates dependence on the receive signal so that convergence is substantially faster and not signal dependent. Performance of the echo canceller is virtually independent of the receive signal and allows reliable tracking of changes in the echo channel over time.

Method and apparatus for echo cancellation updates in a multicarrier transceiver system

An echo canceler ( ) includes a summing device ( ) that subtracts a correction signal from a received signal, the difference of which represents the far-end signal with an error component. Instead of adapting its coefficients using the output of the summing device ( ), the echo canceler ( ) uses the difference between the input and output of a decision device ( ) as an estimate of the error component alone. The estimate of the error component is then used to adapt the coefficients according to the adaptive least mean squares (LMS) algorithm. In one embodiment, the decision device ( ) forms discrete multi-tone symbols based on the equalized output of the summing device. In this embodiment, the echo canceler ( ) performs an inverse of the equalization step efficiently by replacing a division operation with a multiply operation and a corresponding power-of-two shift operation.

In the present invention, an ADSL system (,) identifies good bin as a bin capable of successfully transmitting data to a destination. A bad bin is identified as a carrier that is not capable of successfully transmitting data to the destination. A marginal bin is identified as a carrier that may be capable of transmitting data to the destination. The power to a bad bin is reduced and allocated to the marginal or good bin(s) to allow an increased bit rate. In another embodiment, the power to marginal bin is reduced and allocated to the good bin(s).

Method for allocating data and power in a discrete, multi-tone communication system

In the present invention, carriers associated with a discrete multi-tone (DMT) communications system (,) are sorted according to bit allocation capacity. The number of bits needed to attain a specified bit rate are then allocated beginning with the carrier having the greatest bit allocation capacity and proceeding toward the carrier having the least bit allocation capacity until all bits to are allocated. Once allocated, the power to any unused bins is reduced. Different subsets of the carriers between line cards can be specified in order to reduce crosstalk between adjacent lines.

Method for allocating data and power in a discrete multi-tone communication system

A transceiver (5) for an asymmetric communication system such as asymmetric digital subscriber line (ADSL) includes a configuration register (71) defining operation at either a central office (CO) or a remote terminal (RT). The configuration register (71) includes a control bit (72) for selecting either CO or RT mode. The transceiver (5) includes a signal processing module (70) configured according to the state of the control bit (72). For example, a digital interface (70) converts transmit data into transmit symbols and converts received symbols into receive data. The digital interface (70) uses a large memory (158) as a buffer in the transmit path and a small memory (160) as a buffer in the receive path in CO mode. In RT mode, the digital interface (70) uses the small memory (160) in the transmit path and the large memory (158) in the receive path. The selective configuration allows a single integrated circuit to be used in both CO and RT equipment.

Single-chip software configurable transceiver for asymmetric

A method for recovering the clock in an ADSL (asymmetric digital subscriber line) communication system at the receiver to match the frequency of the transmitted signal. A digital phase locked loop (DPLL) based clock is used to adjust the frequency of data read accesses from a FIFO (first-in first-out) memory (26) in a transceiver unit. The frequency is adjusted according to a predetermined offset value, where the offset value indicates the relative difference between a read location in the FIFO memory (26) and a write location. The predetermined offset value defines an operating point or nominal data location in the FIFO memory (26). A FIFO phase detector (31) determines and affects the frequency adjustment to maintain the FIFO memory at approximately the operating point. One embodiment provides clock recovery for a received ADSL subchannel and a means to recover a 16 kHz clock for a channel control.

Apparatus and method for clock recovery in a communication system

A symbol generator (804) generates a time-domain discrete multi-tone symbol (810). A magnitude comparator (812) compares the magnitude of the time-domain discrete multi-tone symbol (810) with a magnitude threshold. When the magnitude of the time-domain discrete multi-tone symbol (810) compares unfavorably to the magnitude threshold, a magnitude adjusting symbol (816) is added to the time-domain discrete multi-tone symbol (810) such that the magnitude of the time-domain discrete multi-tone symbol (810) is reduced, thereby reducing the peak-to-average requirements (PAR).

Method and apparatus for reducing peak-to-average requirements in

A flexible asymmetrical digital subscriber line (ADSL) transmitter is able to operate simultaneously with integrated services digital network (ISDN) terminal equipment (TE) using a common telephone line (18). The ADSL transmitter changes the frequency content of a frequency-encoded ADSL signal (104) so that its frequency content does not overlap the frequency content of the ISDN TE signal. A corresponding ADSL receiver located within a central office (CO) adapts to the changed frequency content, allowing the ADSL signal to be transmitted over the telephone line without substantial loss of signal integrity. In one embodiment, an ADSL transmitter (100) converts ADSL symbols making up the frequency-encoded ADSL signal (104) into a corresponding time domain signal. The transmitter (100) then interpolates the time domain signal and high pass filters the interpolated signal. This high pass filtered signal is then converted to analog form, bandpass filtered, and driven onto the telephone line (18).

Flexible asymmetrical digital subscriber line ADSL transmitter, remote

An ADSL receiver (200) receives an upstream modified ADSL signal and an ISDN signal from a remote terminal (32) on a twisted-pair copper wire (18). An ADSL transmitter (100) of the remote terminal (32) transmits the ADSL signal in a frequency range above an ISDN frequency range so that the ADSL signal does not overlap the frequency range of the ISDN signal. In one embodiment, the ADSL receiver (200) includes a band pass filter (201), an analog-to-digital converter (203), a decimator (205), a fast Fourier transform (210), and a digital signal processor (212). The decimator (205) converts the ADSL signal back to base band, thus allowing an ADSL signal source to simultaneously utilize the telephone line with an ISDN signal source, without significantly reducing ADSL throughput.

Flexible asymmetrical digital subscriber line (ADSL) receiver, central

In a communication system that employs DMT technology to couple a primary site (102) to a plurality of secondary sites (104-108), call support infrastructure is obtained as follows. Having received a call request, the primary site (102) identifies targeted subscribers and target secondary sites, i.e., the secondary sites having a targeted subscriber affiliated therewith. Next, the primary site determines a call bit loading table from the site bit loading tables of the target secondary sites. Having done this, the primary site selects, based on bandwidth requirements of the call, at least one carrier channel to provide the infrastructure support for the call.

Method and apparatus for providing infrastructure call support

A data stream provided to a DMT transmitter (114) is altered to produce an ordered data stream. The ordered data stream is produced by storing the data stream using a first addressing scheme, and then reading the data using a second addressing scheme. The ordered data stream is then converted in to a DMT symbol which is transmitted to a DMT receiver (112). The DMT receiver (112), using the first and second addressing schemes, recovers the ordered data stream and then the original data stream.

Growing community of inventors

Cedar Park, TX, United States of America

Matthew A Pendleton