Patents by Inventor Karen M. Schramm
Karen M. Schramm has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9479444Abstract: A method, system and computer program product in a downstream line card of a Cable Modem Termination System (CMTS) for managing downstream traffic for channels and bonded channel groups is provided herein. The method comprises the step of receiving packets for transmission to cable modems and classifying each packet to a flow based on class of service associated with the packet. The method further includes the step of storing the packets in flow queues based, wherein a flow queue is selected based on a flow a packet is associated with and wherein each flow corresponds to a single flow queue.Type: GrantFiled: December 29, 2014Date of Patent: October 25, 2016Assignee: Broadcom CorporationInventors: Joel I. Danzig, Michael R. Robinson, Russell J. Nagle, Karen M. Schramm
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Publication number: 20150215217Abstract: A method, system and computer program product in a downstream line card of a Cable Modem Termination System (CMTS) for managing downstream traffic for channels and bonded channel groups is provided herein. The method comprises the step of receiving packets for transmission to cable modems and classifying each packet to a flow based on class of service associated with the packet. The method further includes the step of storing the packets in flow queues based, wherein a flow queue is selected based on a flow a packet is associated with and wherein each flow corresponds to a single flow queue.Type: ApplicationFiled: December 29, 2014Publication date: July 30, 2015Applicant: Broadcom CorporationInventors: Joel I. DANZIG, Michael R. Robinson, Russell J. Nagle, Karen M. Schramm
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Patent number: 8923131Abstract: A method, system and computer program product in a downstream line card of a Cable Modem Termination System (CMTS) for managing downstream traffic for channels and bonded channel groups is provided herein. The method comprises the step of receiving packets for transmission to cable modems and classifying each packet to a flow based on class of service associated with the packet. The method further includes the step of storing the packets in flow queues based, wherein a flow queue is selected based on a flow a packet is associated with and wherein each flow corresponds to a single flow queue.Type: GrantFiled: February 16, 2011Date of Patent: December 30, 2014Assignee: Broadcom CorporationInventors: Joel I. Danzig, Michael R. Robinson, Russell J. Nagle, Karen M. Schramm
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Publication number: 20120039173Abstract: A method, system and computer program product in a downstream line card of a Cable Modem Termination System (CMTS) for managing downstream traffic for channels and bonded channel groups is provided herein. The method comprises the step of receiving packets for transmission to cable modems and classifying each packet to a flow based on class of service associated with the packet. The method further includes the step of storing the packets in flow queues based, wherein a flow queue is selected based on a flow a packet is associated with and wherein each flow corresponds to a single flow queue.Type: ApplicationFiled: February 16, 2011Publication date: February 16, 2012Applicant: Broadcom CorporationInventors: Joel I. Danzig, Micheal R. Robinson, Russell J. Nagle, Karen M. Schramm
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Patent number: 7016302Abstract: An approach to queuing data at a network switching node includes assigning a queue value such as a priority value or a weight to each of a plurality of queues which temporarily store data packets to be forwarded toward a link on the network. A bandwidth value related to a maximum amount of data to be transferred on the link is defined. A data limit value is assigned to each of the queues to limit the amount of data that can be forwarded from each queue. The data limit value is derived from the bandwidth value for the link. By placing bandwidth-related limits on the queues, low-priority queues are prevented from being dominated by high-priority queues, that is, low-priority queues are not prevented from forwarding their data by the priority structure. Also, the bandwidth-related limits allow for control of traffic flow to prevent overloading lower-capacity links on the network.Type: GrantFiled: August 16, 2000Date of Patent: March 21, 2006Assignee: IronBridge Networks, Inc.Inventors: Karen M. Schramm, Steven J. Schwartz, Leo J. Keegan, Yuval Peduel
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Patent number: 5349606Abstract: Circuit for recovery of a plurality of multipath direct sequence spread spectrum signal components received over a time span, wherein the multipath signal components are components of a signal generated from digital data comprised of data bits at a data bit rate modulated by a pseudo-noise code, consisting of a sequence of chips having a chip rate greater than the data bit rate, wherein the sequence of chips is a code repetition period equal or greater than the received time span of the multipath signal components. A plurality of correlators is provided. Each correlator has a first input for coupling to the multipath signal components, a second input, and an output. A pseudo-noise code generator generates a duplicate of the pseudo-noise code. A time delayer is coupled between the second inputs of a mulitiplicity of the correlators and the pseudo-noise code generator for delaying the duplicate of the pseudo-noise code by a multiple of a time delay equal to the time of a chip duration or less.Type: GrantFiled: December 31, 1992Date of Patent: September 20, 1994Assignee: GTE Government Systems CorporationInventors: John W. Lovell, Karen M. Schramm, William E. DeLisle
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Patent number: 5313490Abstract: Apparatus for indicating the end of an acquisition procedure between a transmitter and receiver in a direct sequence spread spectrum communications system. A transmitter generates a first acquisition code having a first acquisition code period and comprised of digital bits at a first bit rate. A circuit modulates the first digital acquisition code by a pseudo-noise code repeating at a pseudo-noise code period and consisting of a sequence of chips at a chip rate greater than the first bit rate. The first acquisition code period is an integer multiple of the pseudo-noise code period. A circuit modulates a carrier by the first digital acquisition code modulated by the pseudo-noise code. The carrier modulated by said first digital acquisition code modulated by said pseudo-noise code is transmitted for a first period of time. A circuit synchronizes a receiver to the chip rate and carrier frequency. A circuit synchronizes the receiver to the pseudo-noise code period.Type: GrantFiled: December 31, 1992Date of Patent: May 17, 1994Assignee: GTE Government Systems CorporationInventors: Karen M. Schramm, William E. DeLisle, John W. Lovell
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Patent number: 5313491Abstract: Method for indicating the end of an acquisition procedure between a transmitter and receiver in a direct sequence spread spectrum communications system. At a transmitter, a first acquisition code having a first acquisition code period and comprised of digital bits at a first bit rate is generated. The first digital acquisition code is modulated by a pseudo-noise code repeating at a pseudo-noise code period and consisting of a sequence of chips at a chip rate greater than the first bit rate, and wherein the first acquisition code period is an integer multiple of the pseudo-noise code period. A carrier frequency is modulated by the first digital acquisition code modulated by the pseudo-noise code. The carrier is modulated by the first digital acquisition code modulated by the pseudo-noise code is transmitted for a first period of time.Type: GrantFiled: December 31, 1992Date of Patent: May 17, 1994Assignee: GTE Government Systems CorporationInventors: Karen M. Schramm, William E. DeLisle, John W. Lovell
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Patent number: 5303257Abstract: Method for carrier frequency correction in a direct sequence code division multiple access communication system having a carrier frequency, consisting of an expected carrier frequency and a carrier frequency error, modulated by a pseudo-noise code. A local frequency is produced equal to the expected carrier frequency. Received signals are demodulated of the pseudo-noise and mixed with the local frequency. The demodulated signals consist of in-phase signal components and quadrature signal components and the carrier frequency error. Each of the demodulated signal are converted to digital samples. Each signal digital sample is multiplied by stored digitized samples of a plurality of sinusoidal tones to produce a product corresponding to each tone. Each product corresponding to each tone is squared. The resulting squared products are compared to determine which squared product has the maximum value.Type: GrantFiled: December 31, 1992Date of Patent: April 12, 1994Assignee: GTE Government Systems CorporationInventors: Seymour Stein, William E. DeLisle, Karen M. Schramm
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Patent number: 5291517Abstract: A carrier frequency corrector for a receiver for use in a direct sequence code division multiple access communication system having a carrier frequency consisting of an expected carrier frequency and a carrier frequency error, modulated by a pseudo-noise code. A local frequency source provides a local frequency approximately equal to equal to the expected carrier frequency. A demodulator provides complex demodulated received signals stripped of the pseudo-noise code and mixed with the local frequency source. Each of the demodulated signals consists of in-phase signal components and quadrature signal components and the carrier frequency error. A sampler is coupled to the demodulator and converts the demodulated signal components to digital samples. A digital signal processor is coupled to the sampler and multiplies each signal component sample by stored digitized samples of a plurality of closely spaced sinusoidal tones to provide a product corresponding to each tone.Type: GrantFiled: December 31, 1992Date of Patent: March 1, 1994Assignee: GTE Government Systems CorporationInventors: Seymour Stein, William F. DeLisle, Karen M. Schramm