High speed access system over copper cable plant

• US 20050220180A1
• Filed: 03/02/2005
• Published: 10/06/2005
• Est. Priority Date: 02/23/1999
• Status: Active Grant

• Current Assignee: Actelis Networks, Inc.
• Original Assignee: Actelis Networks, Inc.
• Inventors: Barlev, Tuvia, Sharon, Ofer, Shteiman, Arkady Molev
• Granted Patent: US 7,453,929 B2
• Time in Patent Office: Days
• US Class Current: 375/222
• CPC Class Codes: H04L 12/2856 Access arrangements, e.g. Internet access asynchronous transfer mode networks H04L12/5601; broadband local area networks H04L12/2801; optical access or distribution networks H04Q11/0067; access to open networks H04L12/5691; digital subscriber line end-user equipment and bit-level processing of data on a PSTN-based network H04M11/00; home network gateways H04L12/2834; wireless access networks H04W
• CPC Class Codes: H04L 12/2872 Termination of subscriber connections
• CPC Class Codes: H04L 25/08 Modifications for reducing interference; Modifications for reducing effects due to line faults ; Receiver end arrangements for detecting or overcoming line faults
• CPC Class Codes: H04L 25/14 Channel dividing arrangements , i.e. in which a single bit stream is divided between several baseband channels and reassembled at the receiver
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 27/26025 Numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking allocating sub-channels of the transmission path H04L5/003
• CPC Class Codes: H04L 5/023 Multiplexing of multicarrier modulation signals multicarrier modulation H04L27/2601
• CPC Class Codes: H04M 11/062 using different frequency bands for speech and other data

Abstract

A system for transporting a high speed data stream over a plurality of relatively low bandwidth unshielded twisted copper pairs within the local loop plant or in any environment having a plurality of copper lines, such as on campuses, within large buildings, etc. The copper twisted pairs are transformed from a plurality of low bandwidth, low reliability links into a high reliability, very high bandwidth long range communication channel utilizing optimized xDSL transmission technologies over the plurality of copper pairs. A transmit data processor perform scrambling, FEC encoding and interleaving on the data before it is divided and dispatched to the plurality of modem elements for transmission over the local loop plant, either bidirectionally or unidirectionally. On the receiving side, the individual data streams are collected, aggregated and a receive data processor performs de-interleaving, FEC decoding and de-interleaving, resulting in the high speed data stream originally transmitted. The system also includes means for increasing the performance of the xDSL modem elements including crosstalk cancellation, power and PSD control, data rate control and optimal routing of the transmitted signals within the twisted pair binders. Network elements located remotely on the other side of the plurality of copper pairs are provided electrical power. In addition, the system optionally multiplexes a plurality of low bandwidth telephony services over the high speed link using either TDM or FDM techniques.

Claims

1-53. -53. (canceled)

54. A dispatcher for distributing a high speed data stream among a plurality of modem elements, comprising:

a two dimensional buffer comprising a plurality of cells arranged as a plurality of rows and columns, each row associated with a different modem element and each column representing a single symbol, transmitted at the highest transmission rate;

an input sequencer adapted to distribute said high speed data stream to cells in said buffer, the amount of data rate of the modem corresponding thereto; and

an output sequencer adapted to distribute the contents of the cells in said buffer to said plurality of modem elements.

55. The dispatcher according to claim 54, wherein said input sequencer compromises filling means for:

filling the cells of said buffer with bytes beginning with the first cell of the first row;

finding the next available cell in said buffer;

placing a byte in the next available cell if the maximum allowable number of bytes from one codeword have not yet been placed in the particular row and repeating said steps of finding and placing for all codewords in one cycle of said input sequencer.

56. The dispatcher according to clam 55, wherein said filling means comprises filling any unfilled cells with null symbols.

57-107. -107. (canceled)

108. A method of distributing a high speed date stream among a plurality of modem elements, said method comprising the steps of:

providing a two dimensional buffer comprising a plurality of cells arranged as a plurality of rows and columns, each row associated with a different modem element and each column representing a single symbol, transmitted at the highest transmission rate;

distributing said high speed data stream to cells in said buffer, the amount of data distributed to each row is determined in accordance with the particular data rate of the modem corresponding thereto; and

distributing the contents of the cells in said buffer to said plurality of modem elements.

109. The method according to claim 108, wherein said step of distributing said high speed date stream comprises the steps of:

filling the cells of said buffer with bytes beginning with the first cell of the first row;

finding the next available cell in said buffer;

placing a byte in the next available cell if the maximum allowable number of bytes from one codeword have not yet been placed in the particular row; and

repeating said steps of finding and placing for all codewords in a cycle of said method.

110. The method according to claim 109, wherein said step of filling comprises filling any unfilled cells with null symbols.

111-147. -147. (canceled)