Patents by Inventor Raghu Rajan

Raghu Rajan 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: 8335428
    Abstract: A method is provided for protection switching in an optical network. The method may include establishing a baseline power level for a channel. The method may further include receiving a signal associated with the channel via each of a first path of the optical network and a second path of the optical network. The method may also include monitoring a power intensity of the signal received via the first path. The method may additionally include protection switching from the signal received via the first path to the signal received via the second path in response to a determination that the baseline power level exceeds the power intensity of the signal received via the first path by a predetermined threshold.
    Type: Grant
    Filed: January 13, 2010
    Date of Patent: December 18, 2012
    Assignee: Fujitsu Limited
    Inventors: Surendra Gupta, Vijay Khopade, Raghu Rajan, Manlio Marquez
  • Patent number: 8224180
    Abstract: A method is provided for protection switching in an optical network.
    Type: Grant
    Filed: January 13, 2010
    Date of Patent: July 17, 2012
    Assignee: Fujitsu Limited
    Inventors: Surendra Gupta, Vijay Khopade, Raghu Rajan, Manlio Marquez
  • Publication number: 20110097080
    Abstract: A method is provided for protection switching in an optical network. The method may include establishing a baseline power level for a channel. The method may further include receiving a signal associated with the channel via each of a first path of the optical network and a second path of the optical network. The method may also include monitoring a power intensity of the signal received via the first path. The method may additionally include protection switching from the signal received via the first path to the signal received via the second path in response to a determination that the baseline power level exceeds the power intensity of the signal received via the first path by a predetermined threshold.
    Type: Application
    Filed: January 13, 2010
    Publication date: April 28, 2011
    Applicant: FUJITSU LIMITED
    Inventors: Surendra Gupta, Vijay Khopade, Raghu Rajan, Manlio Marquez
  • Publication number: 20110097081
    Abstract: A method is provided for protection switching in an optical network.
    Type: Application
    Filed: January 13, 2010
    Publication date: April 28, 2011
    Applicant: Fujitsu Limited
    Inventors: Surendra Gupta, Vijay Khopade, Raghu Rajan, Manlio Marquez
  • Patent number: 7730229
    Abstract: Determining an active/standby state for an interface unit includes determining an entity active/standby state for each entity of one or more entities of the interface unit. If each entity active/standby state is standby, then an aggregated active/standby state of the interface unit is established to be standby.
    Type: Grant
    Filed: December 5, 2006
    Date of Patent: June 1, 2010
    Assignee: Fujitsu Limited
    Inventors: Catherine Yuan, Vikas Mittal, Raghu Rajan, Yanbing Li, Milind Kulkarni
  • Patent number: 7602699
    Abstract: A protection method and system for equipment in a network element receives a protection request for an equipment item. A priority of the request and a priority of the equipment item is evaluated relative to all other outstanding protection requests for equipment items in a protection group with the equipment item. A highest priority protection request for a highest priority equipment item is performed.
    Type: Grant
    Filed: May 3, 2005
    Date of Patent: October 13, 2009
    Assignee: Fujitsu Limited
    Inventors: Raghu Rajan, Danny Dharamraj
  • Publication number: 20080285470
    Abstract: Determining an active/standby state of one or more modules of a network element includes provisioning a path through the modules, where the path is for providing a service. A signal is introduced into the path, and the path is monitored. The service is established to be ready in accordance with the monitoring. The modules are determined to be in an active state in response to establishing that the service is ready.
    Type: Application
    Filed: May 18, 2007
    Publication date: November 20, 2008
    Inventors: Catherine Yuan, Yangbing Li, Milind Kulkarni, Raghu Rajan, Vikas Mittal
  • Publication number: 20080126596
    Abstract: Determining an active/standby state for an interface unit includes determining an entity active/standby state for each entity of one or more entities of the interface unit. If each entity active/standby state is standby, then an aggregated active/standby state of the interface unit is established to be standby.
    Type: Application
    Filed: December 5, 2006
    Publication date: May 29, 2008
    Inventors: Catherine Yuan, Vikas Mittal, Raghu Rajan, Yanbing Li, Milind Kulkarni
  • Publication number: 20050195737
    Abstract: A protection method and system for equipment in a network element receives a protection request for an equipment item. A priority of the request and a priority of the equipment item is evaluated relative to all other outstanding protection requests for equipment items in a protection group with the equipment item. A highest priority protection request for a highest priority equipment item is performed.
    Type: Application
    Filed: May 3, 2005
    Publication date: September 8, 2005
    Inventors: Raghu Rajan, Danny Dharamraj
  • Patent number: 6906997
    Abstract: A protection method and system for equipment in a network element receives a protection request for an equipment item. A priority of the request and a priority of the equipment item is evaluated relative to all other outstanding protection requests for equipment items in a protection group with the equipment item. A highest priority protection request for a highest priority equipment item is performed.
    Type: Grant
    Filed: September 8, 2000
    Date of Patent: June 14, 2005
    Assignee: Fujitsu Limited
    Inventors: Raghu Rajan, Danny Dharamraj
  • Publication number: 20040179472
    Abstract: Method and system for shared path protection within an optical ring network wherein the network includes a plurality of nodes. A traffic signal is forwarded on a working path on a wavelength. The working path includes a drop node. The traffic signal is individually monitored the traffic signal on the wavelength at the drop node for a failure. In response to at least a detection at the drop node of the failure, a protection switching request is generated. In response to at least the protection switching request, the network is provisioned to forward the traffic signal on the wavelength on a protection path to the drop node.
    Type: Application
    Filed: March 14, 2003
    Publication date: September 16, 2004
    Inventors: Farid Khalilzadeh, Rajan Venkata Rao, Raghu Rajan, Manish Sinha