Patents Assigned to Cisco Technology
  • Downstream channel change technique implemented in an access network
    Patent number: 7656890
    Abstract: A dynamic channel change technique is disclosed which may be implemented between nodes and a Head End of an access network. Initially a network device may communicate with the Head End via a first downstream channel and a first upstream channel. When the network device receives a dynamic channel change request which includes instructions for the network device to switch to a second downstream channel, the network device may respond by switching from the first downstream channel to the second downstream channel. Thereafter, the network device may communicate with the Head End via the second downstream channel and first upstream channel. Further, according to a specific embodiment, the dynamic channel change request may also include an upstream channel change request for causing the network device to switch from a first upstream channel to a second upstream channel.
    Type: Grant
    Filed: July 10, 2006
    Date of Patent: February 2, 2010
    Assignee: Cisco Technology, Inc.
    Inventors: John T. Chapman, Daniel W. Crocker, Feisal Y. Daruwalla, Joanna Qun Zang, Yong Lu
  • System and method for providing redundant data load sharing in a distributed network
    Patent number: 7657781
    Abstract: In a distributed network, a data entry is received. The data entry is stored in a first one of a plurality of nodes and replicated in a second one of the plurality of nodes in order to provide data redundancy in the distributed network. In the event of a failure of the second one of the plurality of nodes, the data entry that was replicated therein is re-replicated into a third one of the plurality of nodes in order to maintain data redundancy despite the failure of the second one of the plurality of nodes. Data redundancy can be retained despite the failure of the second one of the plurality of nodes as long as the overall capacity for the distributed network remains above an initial threshold.
    Type: Grant
    Filed: July 25, 2003
    Date of Patent: February 2, 2010
    Assignee: Cisco Technology, Inc.
    Inventors: Walter G. Dixon, Robert A. Mackie, Thomas R. Bakita, Dwight R. Frye, Jr., John G. White, Keith R. Schomburg
  • Methods and apparatus for performing efficient inverse transform operations
    Patent number: 7656949
    Abstract: According to the present invention, methods and apparatus for performing efficient inverse transform operations are provided. Zero patterns are identified in a block of transform coefficients to derive zero pattern information. Using the zero pattern information, inverse transform operations are performed on a subset of the columns of the block of transform coefficients. Zero patterns can optionally be identified in the resulting block. One-dimensional inverse transform operations are then performed on the rows of the resulting block to complete the inverse transform. In another example, one-dimensional inverse transform operations can be performed first on the rows and then on the columns.
    Type: Grant
    Filed: June 27, 2001
    Date of Patent: February 2, 2010
    Assignee: Cisco Technology, Inc.
    Inventors: Ji Zhang, Shan Zhu
  • Transmission control protocol (TCP)
    Patent number: 7656800
    Abstract: According to the present invention, methods and apparatus are provided to improve the Transmission Control Protocol (TCP) for data such as delay sensitive or bursty data. A maximum send window and a minimum send window are set to correspond to maximum and minimum bandwidth parameters associated with a network. Round trip times are monitored to adjust maximum send windows and minimum send windows. A variable rate shaper is also used to pace packet introduction onto the network.
    Type: Grant
    Filed: September 24, 2004
    Date of Patent: February 2, 2010
    Assignee: Cisco Technology, Inc.
    Inventor: Guglielmo M. Morandin
  • Method and apparatus for interleaving text and media in a real-time transport session
    Patent number: 7656861
    Abstract: Text is interleaved and transported along with media data over the same real-time Internet Protocol (IP) media transport session. A network processing device identifies text characters corresponding with text signaling. The identified text characters are formatted into text packets and sent over the same real-time IP media transport session used for real-time media transport. The media transport session can identify the sequence that the text characters are transmitted and can specify a maximum character transfer rate.
    Type: Grant
    Filed: November 3, 2004
    Date of Patent: February 2, 2010
    Assignee: Cisco Technology, Inc.
    Inventors: Paul Edwin Jones, Rajesh Kumar, Mehryar Khalili Garakani, Herbert Michael Wildfeuer
  • Method and apparatus for improving convergence in networks
    Patent number: 7656819
    Abstract: A method of improving convergence in networks that use path vector protocols. In one embodiment using Border Gateway Protocol (BGP) for inter-domain route and reachability communication, nodes that need to remove routes using EBGP NLRI announcements send BGP WITHDRAW messages containing a new route originator attribute that identifies an originator of a specified withdrawn route. A receiving node removes the specified route from its routing information base (RIB), and matches the originator to other paths in the RIB. Matching paths are marked as ineligible for consideration in a best path computation, thereby preventing the use of routes that are unreachable but not yet withdrawn by an originating node. The approach causes faster BGP convergence, reduces unnecessary route flapping, and alleviates unnecessary route dampening.
    Type: Grant
    Filed: November 4, 2005
    Date of Patent: February 2, 2010
    Assignee: Cisco Technology, Inc.
    Inventors: Keyur Patel, Chandrashekhar Appanna, John Scudder
  • System and method for providing enhanced caller ID in a session initiation protocol (SIP) environment
    Patent number: 7656878
    Abstract: A method for facilitating a data session in an initiation protocol (SIP) environment is provided that includes receiving a solicitation for participation in a SIP communication session that involves a first endpoint and a second endpoint. The method also includes identifying an identity trait associated with the first endpoint. In more particular embodiments, various alternative methods may include generating a network search associated with the first endpoint that is seeking to contact the second endpoint in order to conduct the SIP communication session. The results of the network search may be displayed for the second endpoint.
    Type: Grant
    Filed: December 3, 2004
    Date of Patent: February 2, 2010
    Assignee: Cisco Technology, Inc.
    Inventors: Denise G. Caballero-McCann, Stephen Levy
  • Method and system for interference reduction in a wireless communication network using a joint detector
    Patent number: 7656936
    Abstract: A method and system for reducing interference in a wireless communication network is disclosed. The wireless communication network has at least one base station using an antenna array and one or more code channels to receive or transmit one or more communication signals from or to a plurality of terminals used by one or more users. A signal received by the antenna array carries one or more training sequences and a traffic signal in a frame. After estimating a spatial signature and joint channel response model per user based on the training sequences, one or more spatial weights are found based on the estimated spatial signature and joint channel response model to maximize a signal to noise ratio. A joint detection matrix is then formed based on the estimated spatial weights, the joint channel response model, and a user code channel assignment.
    Type: Grant
    Filed: January 28, 2003
    Date of Patent: February 2, 2010
    Assignee: Cisco Technology, Inc.
    Inventors: Hang Li, Weidong Yang, Guanghan Xu
  • Monitoring of data packets in a fabric
    Patent number: 7656812
    Abstract: A method of monitoring network traffic in a fabric and a Fibre Channel network are provided. The method includes: transmitting a monitoring configuration message to a plurality of fabric elements in a Fibre Channel network, said monitoring configuration message including classification criteria identifying packets to be monitored; receiving copies of identified packets from the plurality of fabric elements; and analyzing the copies of identified packets to determine data transmission status in the Fibre Channel network.
    Type: Grant
    Filed: July 27, 2006
    Date of Patent: February 2, 2010
    Assignee: Cisco Technology, Inc.
    Inventors: Raja Rao Tadimeti, Madhava Rao Cheethirala
  • System and method for determining a preferred mirrored service in a network by evaluating a border gateway protocol
    Patent number: 7657643
    Abstract: An embodiment of the present invention is a system and method for selecting a mirrored service in a network, such as the Internet, by utilizing a Border Gateway Protocol (BGP) attribute. According to an embodiment of the present invention, the BGP attribute, which may be stored in a border router, is accessed for each mirrored service for a prefix associated with the user requesting a host name. The attributes from each mirrored service are compared with each other to determine a “best” attribute which meets a predetermined criteria. The mirrored service associated with the best attribute is then selected as a resolution for the host name.
    Type: Grant
    Filed: January 23, 2007
    Date of Patent: February 2, 2010
    Assignee: Cisco Technology, Inc.
    Inventor: Dhaval N. Shah
  • Power Delivery Over Ethernet Cables
    Publication number: 20100023784
    Abstract: A method for power delivery comprises coupling an Ethernet cable comprising four wire pairs to a power delivery system and providing power to a powered device on all of the wire pairs. A power delivery system includes an interface operable to couple to an Ethernet cable comprising four wire pairs and a controller operable to provide power to a powered device on all of the wire pairs.
    Type: Application
    Filed: October 5, 2009
    Publication date: January 28, 2010
    Applicant: Cisco Technology, Inc.
    Inventors: Frederick R. Schindler, Wael William Diab
  • NEIGHBOR DISCOVERY IN CABLE NETWORKS
    Publication number: 20100020821
    Abstract: A network device has a communications link to allow the device to communicate with customer devices and a processor. The processor is to receive neighbor discovery messages from requesting customer devices, examine the neighbor discovery messages to determine if the neighbor discovery message should be forwarded to other of the customer devices, and respond to the requesting customer devices.
    Type: Application
    Filed: October 1, 2009
    Publication date: January 28, 2010
    Applicant: Cisco Technology, Inc.
    Inventors: Ralph Edward Droms, Madhu Sudan
  • Method and apparatus for guaranteed in-order delivery for FICON over SONET/SDH transport
    Patent number: 7653066
    Abstract: In network systems for transporting GFP-encapsulated FICON frames across a SONET/SDH transport network between FICON ports, the transport interfaces for the FICON ports operate to drop duplicate and out-of-order frames transported across the SONET/SDH network. The transmitting transport interface inserts a sequence number incremented with each FICON frame into said one or more transport frames, whereby the sequence number is used as an index for determining duplicate and out-of-order frames after transport over said SONET/SDH network. The receiving transport interface compares sequence numbers with each FICON frame to determine duplicate and out-of-order FICON frames, drops the duplicate and out-of-order FICON frames; and sends the balance of the compared FICON frames to the receiving FICON port.
    Type: Grant
    Filed: November 4, 2004
    Date of Patent: January 26, 2010
    Assignee: Cisco Technology Inc.
    Inventors: Ganesh Sundaram, Hitesh Amin, John Diab, Thomas Eric Ryle, Charles Allen Carriker, Jr., Marc Bennett, Michael D. Blair
  • System and method for detecting an infective element in a network environment
    Patent number: 7653941
    Abstract: A method for detecting an infective element in a network environment is provided that includes detecting, by a first computer, an infective element within a second computer. A signal is generated and communicated that identifies the second computer as being associated with the infective element. The signal includes an address associated with the second computer. The signal is received and, in response to the signal, a communicating capability of the second computer is disabled.
    Type: Grant
    Filed: September 1, 2006
    Date of Patent: January 26, 2010
    Assignee: Cisco Technology, Inc.
    Inventor: Robert E. Gleichauf
  • Digital video streaming over optical network
    Patent number: 7653924
    Abstract: Systems and methods for carrying a serial digital video stream over an optical network such as an optical network employing SONET/SDH or G.709. For example, serial digital video data formatted in accordance with ANSI/SMPTE 259 M-1997 may be carried. Also, a common interface may be provided for both serial digital video streams and packetized digital video data such as DVB-ASI data.
    Type: Grant
    Filed: October 1, 2003
    Date of Patent: January 26, 2010
    Assignee: Cisco Technology, Inc.
    Inventors: Yu Deng, Sharat Prasad
  • Efficient cookie generator
    Patent number: 7653938
    Abstract: A method for processing communication traffic includes receiving a data packet sent over a network from a source address and reading a value of an attribute from the data packet. The value is hashed to determine a key, which is used as an index in extracting a tag from a table of random values. A decision is made using the tag regarding forwarding of the communication traffic from the source address.
    Type: Grant
    Filed: February 3, 2005
    Date of Patent: January 26, 2010
    Assignee: Cisco Technology, Inc.
    Inventors: Dan Touitou, Guy Pazi, Yehiel Shtein
  • Method and apparatus for distributed network address translation processing
    Patent number: 7653745
    Abstract: Methods and apparatuses for distributing network address translation. By having a gateway inform inside devices of global addresses, the gateway can avoid performing many functions of a traditional NAT box. Specifically, an inside device is informed of a global address shared by all devices on the inside device's network segment. Each device on that segment would be assigned a range of ports to distinguish messages from separate devices that use the same global address.
    Type: Grant
    Filed: June 4, 2003
    Date of Patent: January 26, 2010
    Assignee: Cisco Technology, Inc.
    Inventors: Kaushik P. Biswas, Siva S. Jayasenan, Michael J. Sullenberger, Mark A. Denny, Senthil Sivakumar, Suresh Satapati
  • Method and apparatus for providing optimal VoIP call routing in VRF environment
    Patent number: 7653048
    Abstract: A method of providing VoIP call routing in a virtual private network is disclosed. A first gatekeeper issues an information request to a gateway. The first gatekeeper receives from the gateway information organized in a string and based on the information in this string recommends to a second gatekeeper a transmission route through a virtual private network. The second gatekeeper then uses this recommendation to select the transmission route for a VoIP call through the virtual private network.
    Type: Grant
    Filed: April 7, 2005
    Date of Patent: January 26, 2010
    Assignee: Cisco Technology, Inc.
    Inventors: Feng Cao, Radhika Padmanabhan
  • Light pipe mounting interface
    Patent number: 7653283
    Abstract: In an example embodiment, a light pipe mounting interface may include a support strip and at least one light pipe projecting from the support strip. The light pipe is to extend through a housing. A hook projects from the support strip to engage with the housing, and a cantilever snap head projects from an extension of the support strip to engage with the housing. The cantilever snap head and the hook lock the light pipe in a predetermined position with respect to the housing.
    Type: Grant
    Filed: October 31, 2007
    Date of Patent: January 26, 2010
    Assignee: Cisco Technology, Inc.
    Inventors: George Youzhi Yi, Truong Minh Doan
  • Method and system for emulating an ethernet link over a sonet path
    Patent number: 7653526
    Abstract: A method and system for emulating an Ethernet link over a Sonet path to provide link integrity is disclosed. The method generally includes receiving an error code at a local Ethernet port upon detection of a link failure at a remote Ethernet port. The error code is received over a Sonet path in a Sonet path overhead. If the error code is still present after a specified period of time, the local Ethernet port is disabled. Methods for providing link stability and link availability are also disclosed.
    Type: Grant
    Filed: August 16, 2002
    Date of Patent: January 26, 2010
    Assignee: Cisco Technology, Inc.
    Inventors: Thomas Eric Ryle, Sanjeev Rampal, Jimmy Philip Ervin, Charles Allen Carriker, Jr., Russell Eugene Gardo