Source: http://www.google.com/patents/US7035251?ie=ISO-8859-1
Timestamp: 2015-07-29 08:15:38
Document Index: 602048255

Matched Legal Cases: ['Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60']

Patent US7035251 - Method and apparatus for the synchronization of multiple cable modem ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA plurality of CMTS devices are linked together and synchronized to facilitate communication between the respective CMTS devices and respective downstream cable modems. According to one embodiment of the invention, one of the CMTS devices is designated as a master device, and the other CMTS devices are...http://www.google.com/patents/US7035251?utm_source=gb-gplus-sharePatent US7035251 - Method and apparatus for the synchronization of multiple cable modem termination system devicesAdvanced Patent SearchPublication numberUS7035251 B2Publication typeGrantApplication numberUS 10/856,829Publication dateApr 25, 2006Filing dateJun 1, 2004Priority dateOct 30, 1998Fee statusPaidAlso published asUS6760316, US7899034, US8005072, US20040218589, US20060182148, US20070140209Publication number10856829, 856829, US 7035251 B2, US 7035251B2, US-B2-7035251, US7035251 B2, US7035251B2InventorsAnders Hebsgaard, David R. Dworkin, Lisa V. Denney, Robert J. Lee, Thomas J. QuigleyOriginal AssigneeBroadcom CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (8), Non-Patent Citations (2), Referenced by (7), Classifications (20), Legal Events (5) External Links: USPTO, USPTO Assignment, EspacenetMethod and apparatus for the synchronization of multiple cable modem termination system devices
US 7035251 B2Abstract
a master cable modem termination system device having a first counter; and
a first slave cable modem termination system device having a second counter;
wherein the first slave cable modem termination system device sets the second counter based on a signal provided by the master cable modem termination system device; and
wherein the second counter is used to generate timing information for transmission by the first slave cable modem termination system device.
2. The communication system of claim 1, wherein the first slave cable modem termination system device synchronizes the second counter with the first counter based on the signal.
3. The communication system of claim 1, wherein the master cable modem termination system device provides the signal in response to a value of the first counter corresponding to predetermined time stamp information.
a second slave cable modem termination system device having a third counter;
wherein the second slave cable modem termination system device sets the third counter based on the signal provided by the master cable modem termination system device.
5. The communication system of claim 4, wherein the master cable modem termination system device and the first and second slave cable modem termination system devices are connected via a synchronization bus.
6. The communication system of claim 1, wherein the master cable modem termination system device generates the signal based on time stamp information received from a processor.
7. The communication system of claim 6, wherein the processor updates the time stamp information in response to a lapse of a predetermined amount of time.
a first cable modem termination system device to transmit MAP information to a plurality of cable modems, the MAP information including identifiers associated with respective upstream channels that are connected to the cable modems; and
a second cable modem termination system device connected to an upstream channel, wherein the second cable modem termination system device filters the MAP information based on an identifier of the MAP information that is associated with the upstream channel that is connected to the second cable modem termination system device.
9. The communication system of claim 8, wherein the second cable modem termination system device stores a portion of the MAP information that is associated with the upstream channel that is connected to the second cable modem termination system device.
10. The communication system of claim 8, wherein the second cable modem termination system device disregards a portion of the MAP information that is not associated with the upstream channel that is connected to the second cable modem termination system device.
11. The communication system of claim 8, wherein the first cable modem termination system device transmits the MAP information to the second cable modem termination system device.
storing time stamp information at a first slave cable modem termination system device having a first counter;
setting the first counter of the first slave cable modem termination system device based on a signal provided by a master cable modem termination system device having a second counter; and
generating timing information for transmission by the first slave cable modem termination system device using the first counter.
13. The method of claim 12, wherein setting the first counter includes synchronizing the first counter with the second counter based on the signal.
14. The method of claim 12, wherein storing the time stamp information includes storing the time stamp information associated with a future time stamp.
15. The method of claim 12, wherein setting the first counter is performed in response to detecting a time stamp value at the second counter that corresponds to the time stamp information.
setting a third counter of a second slave cable modem termination system device based on the signal provided by the master cable modem termination system device.
connecting the master cable modem termination system device and the first and second slave cable modem termination system devices via a synchronization bus.
transmitting MAP information including identifiers associated with respective upstream channels from a first cable modem termination system device to cable modems connected to the upstream channels; and
filtering the MAP information at a second cable modem termination system device based on an identifier of the MAP information that corresponds with an upstream channel that is connected to the second cable modem termination system device.
storing a portion of the MAP information that corresponds with the upstream channel that is connected to the second cable modem termination system device at the second cable modem termination system device.
disregarding a portion of the MAP information that does not correspond with the upstream channel that is connected to the second cable modem termination system device at the second cable modem termination system device.
transmitting the MAP information from the first cable modem termination system device to the second cable modem termination system device, wherein filtering the MAP information at the second cable modem termination system device is performed in response to transmitting the MAP information from the first cable modem termination system device to the second cable modem termination system device.
This application is a continuation of U.S. application Ser. No. 09/653,155 filed Aug. 31, 2000, now U.S. Pat. No. 6,760,316, which claims the benefit of the filing date of U.S. provisional Application No. 60/151,661 filed Aug. 31, 1999, and is also a Continuation-In-Part of U.S. regular application Ser. No. 09/574,558, filed on May 19, 2000, now U.S. Pat. No. 6,650,624, issued Nov. 18, 2003 which is a Continuation of U.S. regular application Ser. No. 09/430,821, filed on Oct. 29, 1999 now abandoned, which claimed the benefit of the filing date of U.S. Provisional Patent Application No. 60/106,264, filed Oct. 30, 1998 and entitled HEADEND UPSTREAM MAC/PHY INTERFACE; U.S. Provisional Patent Application No. 60/106,427, filed Oct. 30, 1998 and entitled ROBUST TECHNIQUE FOR OPTIMAL UPSTREAM COMMUNICATION BETWEEN CABLE MODEM SUBSCRIBER AND A HEADEND); U.S. Provisional Patent Application No. 60/106,438, filed Oct. 30, 1998 and entitled SYSTEM FOR, AND METHOD OF, FRAGMENTING DATA PACKETS IN A CABLE MODEM SYSTEM; U.S. Provisional Patent Application No. 60/106,439, filed Oct. 30, 1998 and entitled CABLE MODEM SYSTEM; U.S. Provisional Patent Application No. 60/106,440, filed Oct. 30, 1998 and entitled NETWORK DATA TRANSMISSION SYNCHRONIZATION SYSTEM AND METHOD; U.S. Provisional Patent Application No. 60/106,441, filed Oct. 30, 1998 and entitled BURST RECEIVER SYSTEM, the entire contents of all of which are hereby expressly incorporated by reference.
This invention is used in a CMTS device disclosed in an application entitled “Method and Apparatus for the Reduction of Upstream Request Processing Latency in a Cable Modem Termination System” Ser. No. 60/151,665, filed on even date herewith by Lisa Denney, Angers Hebsgaard, and Robert J. Lee, the disclosure of which is incorporated fully herein by reference.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS5790806Apr 3, 1996Aug 4, 1998Scientific-Atlanta, Inc.Cable data network architectureUS5912895May 1, 1996Jun 15, 1999Northern Telecom LimitedInformation network access apparatus and methods for communicating information packets via telephone linesUS6349138 *Apr 23, 1997Feb 19, 2002Lucent Technologies Inc.Method and apparatus for digital transmission incorporating scrambling and forward error correction while preventing bit error spreading associated with descramblingUS6510162May 27, 1998Jan 21, 20033Com CorporationSystem and method for managing channel usage in a data over cable systemUS6526070Oct 9, 1999Feb 25, 2003Conexant Systems, Inc.Method and apparatus for upstream burst transmissions synchronization in cable modemsUS6583825 *Aug 9, 1996Jun 24, 2003Index Systems, Inc.Method and apparatus for transmitting and downloading setup informationUS6760316 *Aug 31, 2000Jul 6, 2004Broadcom CorporationMethod and apparatus for the synchronization of multiple cable modem termination system devicesEP0727883A2Feb 9, 1996Aug 21, 1996Kabushiki Kaisha ToshibaInformation communication network system, central information communication control device and information communication device used in the system, information sending method, and modulation method* Cited by examinerNon-Patent CitationsReference1Copy of International Search Report for International Appl. No. PCT/US00/23928, filed Aug. 31, 2000.2U.S. Appl. No. 09/652,718, filed Aug. 31, 2000, Denney et al.Referenced byCiting PatentFiling datePublication dateApplicantTitleUS7583704 *Jun 10, 2003Sep 1, 2009Carl WalkerSynchronizing separated upstream and downstream channels of cable modem termination systemsUS7801176 *Oct 21, 2005Sep 21, 2010Broadcom CorporationCable modem system with sample and packet synchronizationUS7839773 *Mar 14, 2008Nov 23, 2010Cisco Technology, Inc.Modem timing offset compensation for line card redundancy failoverUS7843810Jun 17, 2008Nov 30, 2010Cisco Technology, Inc.Keeping modems online upon N+1 switchover in cable modem termination systemsUS7899034 *Feb 2, 2007Mar 1, 2011Broadcom CorporationMethods for the synchronization of multiple base stations in a wireless communication systemUS8005072Mar 30, 2006Aug 23, 2011Broadcom CorporationSynchronization of multiple base stations in a wireless communication systemUS8718091Aug 16, 2010May 6, 2014Broadcom CorporationCable modem system with sample and packet synchronization* Cited by examinerClassifications U.S. Classification370/352, 370/432, 370/493, 375/222International ClassificationH04L25/03, H04J3/06, H04L12/28, H04B1/10, H04L12/56, H04L12/66Cooperative ClassificationH04J3/0664, H04L25/03343, H04J3/067, H04J3/0682, H04B1/1036, H04L12/2801, H04L2025/03808European ClassificationH04J3/06C1P2S, H04L25/03B9, H04L12/28BLegal EventsDateCodeEventDescriptionJun 1, 2004ASAssignmentOwner name: BROADCOM CORPORATION, CALIFORNIAFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HEBSGAARD, ANDERS;DWORKIN, DAVID R.;DENNEY, LISA V.;AND OTHERS;REEL/FRAME:015416/0046Effective date: 20000926Mar 30, 2006ASAssignmentOwner name: BROADCOM CORPORATION, CALIFORNIAFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HEBSGAARD, ANDERS;DWORKIN, DAVID R.;DENNEY, LISA V.;AND OTHERS;REEL/FRAME:017701/0751Effective date: 20000926Oct 23, 2009FPAYFee paymentYear of fee payment: 4Nov 12, 2013FPAYFee paymentYear of fee payment: 8Nov 12, 2013SULPSurcharge for late paymentYear of fee payment: 7RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services