Patents by Inventor David H. Liu

David H. Liu 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).

  • Patent number: 9742680
    Abstract: Disclosed herein are methods and calculators for configuring traffic allocations for service classes with different Quality of Service (QoS) in a router. Example embodiments involve setting allocations at a router based on traffic rate values and/or traffic weight values provided by a user. The router may monitor actual traffic rates to ensure that traffic is not being dropped due to improper rate allocations and to provide historical data for optimizing traffic allocations. In addition, the router may automatically adjust traffic allocations to avoid dropping high(er) priority traffic. The router may also transmit alarms to the user and/or to other network devices to prompt traffic re-routing and/or re-allocation of traffic rates. Example methods and apparatus ensure appropriate traffic allocation to meet certain QoS metrics.
    Type: Grant
    Filed: September 4, 2014
    Date of Patent: August 22, 2017
    Assignee: Coriant Operations, Inc.
    Inventors: Leo S. Lee, Timothy E. Blair, David H. Liu
  • Publication number: 20150103652
    Abstract: Disclosed herein are methods and calculators for configuring traffic allocations for service classes with different Quality of Service (QoS) in a router. Example embodiments involve setting allocations at a router based on traffic rate values and/or traffic weight values provided by a user. The router may monitor actual traffic rates to ensure that traffic is not being dropped due to improper rate allocations and to provide historical data for optimizing traffic allocations. In addition, the router may automatically adjust traffic allocations to avoid dropping high(er) priority traffic. The router may also transmit alarms to the user and/or to other network devices to prompt traffic re-routing and/or re-allocation of traffic rates.
    Type: Application
    Filed: September 4, 2014
    Publication date: April 16, 2015
    Inventors: Leo S. Lee, Timothy E. Blair, David H. Liu
  • Patent number: 8842537
    Abstract: Disclosed herein are methods and calculators for configuring traffic allocations for service classes with different Quality of Service (QoS) in a router. Example embodiments involve setting allocations at a router based on traffic rate values and/or traffic weight values provided by a user. The router may monitor actual traffic rates to ensure that traffic is not being dropped due to improper rate allocations and to provide historical data for optimizing traffic allocations. In addition, the router may automatically adjust traffic allocations to avoid dropping high(er) priority traffic. The router may also transmit alarms to the user and/or to other network devices to prompt traffic re-routing and/or re-allocation of traffic rates. Example methods and apparatus ensure appropriate traffic allocation to meet certain QoS metrics.
    Type: Grant
    Filed: August 24, 2011
    Date of Patent: September 23, 2014
    Assignee: Tellabs Operations, Inc.
    Inventors: Leo S. Lee, Timothy E. Blair, David H. Liu
  • Publication number: 20120051217
    Abstract: Disclosed herein are methods and calculators for configuring traffic allocations for service classes with different Quality of Service (QoS) in a router. Example embodiments involve setting allocations at a router based on traffic rate values and/or traffic weight values provided by a user. The router may monitor actual traffic rates to ensure that traffic is not being dropped due to improper rate allocations and to provide historical data for optimizing traffic allocations. In addition, the router may automatically adjust traffic allocations to avoid dropping high(er) priority traffic. The router may also transmit alarms to the user and/or to other network devices to prompt traffic re-routing and/or re-allocation of traffic rates. Example methods and apparatus ensure appropriate traffic allocation to meet certain QoS metrics.
    Type: Application
    Filed: August 24, 2011
    Publication date: March 1, 2012
    Applicant: Tellabs Operations, Inc.
    Inventors: Leo S. Lee, Timothy E. Blair, David H. Liu
  • Publication number: 20100003002
    Abstract: The need for fiber optic connectors is increasing as the use of fiber optic transmission members is being incorporated in data and other transmission systems. Typically, strain relief provides extra support at the junction of a cable and connector interface. However, there is a need to provide strain relief for the connector portion itself. An example cover includes a housing member defining an aperture spanning transversely from a first end to a second end and engages a connector therewithin. The cover further includes at least two prongs protruding from the first end in a direction opposite to the second end in an axial direction relative to the aperture. The prongs may be inserted into a panel defining at least two openings to receive the prongs. The prongs in combination with the housing member provide strain relief to the connector in an angular direction relative to the at least two prongs.
    Type: Application
    Filed: July 3, 2008
    Publication date: January 7, 2010
    Applicant: Tellabs Vienna, Inc.
    Inventors: Marc R. Bernard, Douglas A. Atkinson, Joseph C. Roesch, Adrian S. Chan, David H. Liu
  • Publication number: 20090328190
    Abstract: Flaws in information security infest modern software, and pervasive computing has made network systems vulnerable. Information security is constantly endangered by errors in protocol implementations. Testing a protocol implementation for errors directly from a network where a device implementing the protocol resides limits the coverage of protocols tested. In contrast, testing protocols from an access network that internetworks a customer premises with one or more service networks greatly expands the coverage of protocols tested. Accordingly, a method and corresponding apparatus are provided to test from the access network, testing both service network devices and customer premises devices, and the protocols implemented on those devices.
    Type: Application
    Filed: June 25, 2008
    Publication date: December 31, 2009
    Inventors: David H. Liu, Shih-Chang Liang, Marc R. Bernard, Guy M. Merritt, Fung-Chang Huang
  • Publication number: 20090319666
    Abstract: Collecting diagnostic information from a remote device in today's networks is limited to system related information. However, of more interest to vendors of commercial products or services is information related to, for example, how their products, services or advertisement are perceived by end users. Accordingly, a method and corresponding apparatus according to an embodiment of the present invention are provided that extends the Session Initiated Protocol (SIP) NOTIFY mechanism. Originally defined for server to client or downstream notification of a state of a resource or of an event, the present invention extends this functionality to include uploading information other than a state of a resource or of an event from the client to the server or upstream. As such, information, such as usage behavior of a user, may now be collected to understand end user perception of products, services or advertisements.
    Type: Application
    Filed: June 18, 2008
    Publication date: December 24, 2009
    Inventors: Shih-Chang Liang, David H. Liu
  • Publication number: 20090310615
    Abstract: Example embodiments of the present invention help extend service provider visibility to all premises equipment (CPE) devices that are ranged with an Optical Line Terminal (OLT) by associating an Optical Network Terminal (ONT) within each device (CPE-ONT), such as a personal computer (PC), set-top box (STB), broadband home router (BHR), or analog telephone adapter (ATA). Therefore, each CPE device is managed independently via the CPE-ONT integrated with it. This allows each CPE device to terminate only optical signals supporting communications supported by the CPE device. Further, each CPE device has access to the entire GPON bandwidth, thereby increasing performance and eliminating bottlenecks caused by electrical communications over 10/100/1000 BaseT interfaces.
    Type: Application
    Filed: June 13, 2008
    Publication date: December 17, 2009
    Applicant: Tellabs Vienna, Inc.
    Inventors: Marc R. Bernard, Douglas A. Atkinson, Guy M. Merritt, David H. Liu, Joseph D. Kralowetz
  • Publication number: 20090313476
    Abstract: In traditional networks, a user provides an authorization to establish a connection for services with an Optical Network Terminal (ONT) and an Optical Line Terminal (OLT). The ONT becomes vulnerable to unauthorized users because the ONT restricts access at an Internet Protocol level. An embodiment of the present invention includes a system that restricts user access to services by causing a ranging fault to disable an ONT from communicating upstream with the OLT in an event the user fails to provide a valid ONT level user authorization. In an event the ONT is in a ranged state and the user fails to provide a valid service level authorization, the system causes a service level fault to restrict the ONT from granting user access to the user to services. Thus, unauthorized users are prevented access to the ONT and increased security is achieved.
    Type: Application
    Filed: June 11, 2008
    Publication date: December 17, 2009
    Applicant: Tellabs Vienna, Inc.
    Inventors: David H. Liu, Guy M. Merritt, Douglas A. Atkinson, Fung-Chang Huang, Marc R. Bernard
  • Publication number: 20090296584
    Abstract: Because networks, such as Optical Distributed Networks (ODNs), dynamically change over time as more users and services are added, service providers are challenged to test operational robustness following installation of equipment or provisioning of services or upgrades. Example embodiments of the present invention allow testing of various services along a communications path, including software upgrades, throughput tests and simulations, and combinations of simulated scenarios with live customer traffic. The example embodiments allow generation of reports based on the testing of various services so that a technician may correct errors and ensure proper provisioning during equipment installation. Such testing may be useful to detect installation or activation problems encountered when a subscriber activates a service at a later date or adds additional devices. The example embodiments simplify installation and provisioning, saving service providers cost on a per installation or provisioning basis.
    Type: Application
    Filed: June 3, 2008
    Publication date: December 3, 2009
    Applicant: Tellabs Vienna, Inc.
    Inventors: Marc R. Bernard, Douglas A. Atkinson, David H. Liu, German Garcia
  • Publication number: 20090289534
    Abstract: Customer premises equipment (CPE), such as optical network terminals (ONT), are often located on the outside of a premises, and are susceptible to theft and to weather elements. A cap for portions of customer premises equipment (CPE) used in telecommunications networks protects the CPE from theft and from the weather elements. The cap typically covers a portion of the CPE that carries communications and power connectors, providing protection from the weather elements. Additionally, the cap may be lockable, preventing unauthorized removal of the CPE or portions of the CPE. The cap may also provide strain relief for cables coupled to the CPE. The cap may also prevent unauthorized removal of covers on a CPE housing that protects valuable components, such as battery back-ups.
    Type: Application
    Filed: May 21, 2008
    Publication date: November 26, 2009
    Applicant: Tellabs Vienna, Inc.
    Inventors: Marc R. Bernard, Douglas A. Atkinson, David H. Liu, Joseph C. Roesch
  • Publication number: 20090285576
    Abstract: A method and system for collecting and analyzing diagnostic data relating to an Optical Network Terminal (ONT) anomaly or failure is disclosed. Example embodiments of the method and system employ a SIP configuration server to collect and analyze diagnostic data efficiently to determine a cause of the anomaly or failure in both live and post-mortem scenarios. The collected data may be communicated to a central location, where analysis of the data may be conveniently performed by a technical support entity. The method and system are scalable and may be applied to an entire installed base of ONTs across many individual Passive Optical Networks (PONs).
    Type: Application
    Filed: May 16, 2008
    Publication date: November 19, 2009
    Applicant: Tellabs Vienna, Inc.
    Inventors: Jeffrey A. Noel, Fung-Chang Huang, Adrian S. Chan, David H. Liu, Marc R. Bernard
  • Publication number: 20090269063
    Abstract: Cell phones or other wireless devices are becoming increasingly more accessible to customers, but cell phone features are primarily focused on communications services. A system employing an example embodiment activates services for an Optical Network Terminal (ONT) in the presence of wireless devices. In particular, the ONT responds to a ranging request from an Optical Line Terminal (OLT) with an ONT Identifier (ID) and an ID of a wireless device. If the ID of the wireless device is known, the ONT may enable activate a service, such as a security service for a homeowner. If the ID of the wireless device is unknown, the system may employ security measures, such as notifying the homeowner that a person with a wireless device having an unknown ID is on the premises. Thus, the example embodiment enables or disables premises security or other security based on the ID of the wireless device.
    Type: Application
    Filed: April 25, 2008
    Publication date: October 29, 2009
    Applicant: Tellabs Vienna, Inc.
    Inventors: Marc R. Bernard, David H. Liu, Douglas A. Atkinson, Fung-Chang Huang
  • Publication number: 20090263139
    Abstract: An Optical Network Terminal (ONT) has a fixed number of voice ports. A system employing an example embodiment of the invention increases the number of voice ports without changing hardware in the ONT by employing an Analog Terminal Adaptor (ATA) expander and configuring the ATA expander through use of a Session Initiation Protocol (SIP) and other network resources already available in a network with which the ONT is associated. The ATA expander is configured to be compatible with the ONT and, thus the ONT can increase voice services without hardware changes to support growing demands by customers for access to voice services via increasing number of Customer Premises Equipment (CPE).
    Type: Application
    Filed: April 16, 2008
    Publication date: October 22, 2009
    Applicant: Tellabs Vienna, Inc.
    Inventors: David H. Liu, Guy M. Merritt, Fung-Chang Huang, Marc R. Bernard, Nabeel Zafar
  • Publication number: 20090238561
    Abstract: Systems and methods for measuring and reporting the performance of communications traffic in a Passive Optical Network (PON) are disclosed. According to the disclosed embodiments, the PON network may include an Optical Line Terminal (OLT) and multiple Optical Network Terminals (ONTs) downstream of the OLT. By aggregating multicast communications traffic received by the ONTs at a point downstream of the ONTs, selectively accessing the aggregated communications traffic, collecting information representative of performance of each selected communications traffic, and reporting the collected information upstream to a network management node, communications traffic in the PON network may be tested in both downstream and upstream directions.
    Type: Application
    Filed: March 19, 2008
    Publication date: September 24, 2009
    Inventors: Fung-Chang Huang, David H. Liu, Marc R. Bernard
  • Publication number: 20090180782
    Abstract: An apparatus, system, computer program, and method for providing a Multimedia over Coax Alliance (MoCA) (or other multimedia-over-coaxial cable technology) network in conjunction with an optical network. In example embodiments, MoCA data is communicated between network nodes in an optical signal. In other example embodiments, MoCA data, or other data, is transmitted in optical frequencies above 860 MHz.
    Type: Application
    Filed: January 14, 2008
    Publication date: July 16, 2009
    Applicant: TELLABS VIENNA, INC.
    Inventors: MARC R. BERNARD, Thomas E. Conklin, Douglas A. Atkinson, David H. Liu
  • Publication number: 20090148157
    Abstract: A method, and an apparatus, system, and sequences of instructions that operate in accordance with the method, for identifying errors in communications in a system that provides services. In the method, control messages are generated and sent to a network device. Error information generated in response to an unsupported control message being received by the network device, from at least one controlling device, is stored in the network device. The error information stored in the network device is retrieved, and errors in communications between the network device and the controlling device are identified, based on the error information retrieved.
    Type: Application
    Filed: December 10, 2007
    Publication date: June 11, 2009
  • Publication number: 20090116498
    Abstract: A terminal apparatus includes an ethernet channel that transfers ethernet traffic between an ethernet port and an external network port during a normal operation mode of the apparatus, and a Multimedia over Cable Alliance (MoCA) channel that transfers MoCA traffic between a MoCA port and the external network port during the normal operation mode. The terminal apparatus also includes a test system that bridges the ethernet channel and the MoCA channel during a test mode of the apparatus. Ethernet traffic received by the ethernet port is converted to MoCA traffic and transferred to the MoCA port, and MoCA traffic received by the MoCA port is converted to ethernet traffic and transferred to the ethernet port.
    Type: Application
    Filed: November 7, 2007
    Publication date: May 7, 2009
    Applicant: TELLABS VIENNA, INC.
    Inventors: Fung-Chang Huang, David H. Liu, Jeffrey F. Chu, Charles E. Rothrauff, John Burch
  • Publication number: 20090103694
    Abstract: A network element, a system to deliver voice communications, and methods for delivering voice services from an optical network to a telephone at a location within a premises. The system may include a network element and a telephone system having a connector. The telephone system may be positioned proximate to the network element so that the connector contacts an analog interface of the network element.
    Type: Application
    Filed: October 17, 2007
    Publication date: April 23, 2009
    Applicant: TELLABS VIENNA, INC.
    Inventors: David H. Liu, Guy M. Merritt, Fung-Chang Huang, Marc R. Bernard
  • Publication number: 20090074423
    Abstract: Separating Passive Optical Network (PON) functions in different mechanical devices, such as optical to electrical conversion of the PON protocol, allows installation of an optical termination device at an exterior of an installation premises and installation of a user interface device performing PON functions inside the installation premises. Various embodiments allow service providers first to install an optical device outside the premises and, later, to install an electrical device, optionally by a customer. This eliminates a service provider from entering the installation premises and enables the customer to complete installation in the interior of the installation premises. Further, more robust, hardened components may be used in the more-permanently installed exterior device, while less-expensive, lower-quality components may be used in the easily-replaceable indoor device, thus reducing cost.
    Type: Application
    Filed: December 14, 2007
    Publication date: March 19, 2009
    Applicant: Tellabs Vienna, Inc.
    Inventors: Marc R. Bernard, Joseph C. Roesch, Charles E. Rothrauff, Douglas A. Atkinson, Guy M. Merritt, David H. Liu