Han N Nguyen

US Patent:

7035260, Apr 25, 2006

Filed:

Aug 27, 2001

Appl. No.:

09/939871

Inventors:

Carl E. Betta - Freehold NJ, US
Gerald L Hoover - Red Bank NJ, US
John Jutten Lawser - Holmdel NJ, US
James J. Mansell - Fair Haven NJ, US
Han Q. Nguyen - Marlboro NJ, US
Larry Arnise Russell - Atlantic Highlands NJ, US

Assignee:

AT&T Corp. - Bedminster NJ

International Classification:

H04L 12/28
H04L 12/56

US Classification:

370392, 370401

Abstract:

A network architecture () provides Voice over Internet Protocol (VoIP) service as well as multimedia and Internet web-based applications while implementing features common in a traditional telecommunications network. In response to an incoming call dialed to an IP endpoint (), the network will process the call, and in particular, convert the call, if in not already in a VoIP format, to such a format, while mapping signaling associated with the call into a compatible format. The VoIP call is then routed to the IP endpoint. In the event that the call requires an associated multimedia or Internet-web-based application, the network will initiate the application. Processing of the incoming call may require accessing of a common database to acquire a location routing number for the call destination. To afford dynamic addressing of the IP endpoints, each may be referenced by a corresponding Universal Resource Locator (URL) (or other indirect mapping) associated with the IP address of the endpoint.

US Patent:

7174475, Feb 6, 2007

Filed:

Feb 16, 2001

Appl. No.:

09/785604

Inventors:

Hyun Lee - Ladera Ranch CA, US
Han Nguyen - Allentown PA, US
Lai Q. Pham - San Diago CA, US

Assignee:

Agere Systems Inc. - Allentown PA

International Classification:

G06F 1/04

US Classification:

713503, 713400, 713600, 327233

Abstract:

A method and apparatus are disclosed for dynamically reducing clock skew among various nodes on an integrated circuit. The disclosed clock skew reduction technique dynamically estimates the clock delay to each node and inserts a corresponding delay for each node such that the clock signals arriving at each node are all in phase with a global clock (or 180 out of phase). Delays attributable to both the wire RC delays and the clock buffer delays are addressed. A feedback path for the clock signal associated with each node allows the round trip travel time of the clock signal to be estimated. When the length of the feedback path matches the length of the primary clock path, the clock skew present at the corresponding node can be estimated as fifty percent (50%) of the round trip delay time. Dynamic adjustments to the delay control circuit are permitted as operating conditions shift. Clock signals arriving at individual nodes on the integrated circuit remain in phase with the global PLL clock (PCK), regardless of variations in the operating voltage or temperature (or both).

US Patent:

7313605, Dec 25, 2007

Filed:

Jan 30, 2004

Appl. No.:

10/768518

Inventors:

Ali Murat Iloglu - Laurence Harbor NJ, US
Han Q. Nguyen - Marlboro NJ, US

Assignee:

AT&T Corp. - New York NY

International Classification:

G06F 15/16
G06F 15/173

US Classification:

709219, 709227, 709228, 709229, 709238, 709242, 709244, 709249

Abstract:

A network that supports VPNs is enhanced to allow users in one VPN to communicate with users in another VPN in the course of executing a predefined application, such as VoIP. This capability is achieved dynamically by enabling a device that can communicate with the network elements that operate to normally prohibit inter-VPN communication to direct those network elements to enable such communication, at least for the purposes the purposes of specific applications.

US Patent:

7467227, Dec 16, 2008

Filed:

Dec 30, 2003

Appl. No.:

10/748882

Inventors:

Han Q. Nguyen - Marlboro NJ, US
Tayfun Cataltepe - Fair Haven NJ, US
Samir S. Saad - Long Branch NJ, US

Assignee:

AT&T Corp. - New York NY

International Classification:

G06F 15/173

US Classification:

709239, 709238, 709242

Abstract:

The present invention discloses a method and architecture for enabling multiple services or service providers to share the facilities of an access network infrastructure that provides physical connectivity to subscribers.

US Patent:

8031712, Oct 4, 2011

Filed:

Mar 28, 2006

Appl. No.:

11/392435

Inventors:

Carl E. Betta - Freehold NJ, US
Gerald L Hoover - Red Bank NJ, US
John Jutten Lawser - Holmdel NJ, US
James J. Mansell - Fair Haven NJ, US
Han Q. Nguyen - Marlboro NJ, US
Larry Arnise Russell - Atlantic Highlands NJ, US

Assignee:

AT&T Intellectual Property II, L.P. - Atlanta GA

International Classification:

H04L 12/28
H04L 12/56

US Classification:

370392, 370401

Abstract:

A network architecture () provides Voice over Internet Protocol (VoIP) service as well as multimedia and Internet web-based applications while implementing features common in a traditional telecommunications network. In response to an incoming call dialed to an IP endpoint (), the network will process the call, and in particular, convert the call, if in not already in a VoIP format, to such a format, while mapping signaling associated with the call into a compatible format. The VoIP call is then routed to the IP endpoint. In the event that the call requires an associated multimedia or Internet-web-based application, the network will initiate the application. Processing of the incoming call may require accessing of a common database to acquire a location routing number for the call destination. To afford dynamic addressing of the IP endpoints, each may be referenced by a corresponding Universal Resource Locator (URL) (or other indirect mapping) associated with the IP address of the endpoint.

US Patent:

8040896, Oct 18, 2011

Filed:

Nov 25, 2008

Appl. No.:

12/313846

Inventors:

Han Q. Nguyen - Marlboro NJ, US
Tayfun Cataltepe - Fair Haven NJ, US
Samir S. Saad - Long Branch NJ, US

Assignee:

AT&T Intellectual Property II, L.P. - Reno NV

International Classification:

H04L 12/56

US Classification:

37039531, 370235, 370392

Abstract:

The present invention discloses a method and architecture for enabling multiple services or service providers to share the facilities of an access network infrastructure that provides physical connectivity to subscribers.

US Patent:

8089871, Jan 3, 2012

Filed:

Mar 25, 2005

Appl. No.:

11/090634

Inventors:

Ali M. Iloglu - Laurance Harbor NJ, US
Han Q. Nguyen - Marlboro NJ, US
John T. Mulligan - Brick NJ, US
Samir S. Saad - Long Branch NJ, US

Assignee:

AT&T Intellectual Property II, L.P. - Atlanta GA

International Classification:

G01R 31/08
G06F 7/04
G06F 11/00
G06F 12/14
H04L 12/28
H04L 12/56

US Classification:

370230, 370235, 37039532, 370401, 726 23, 726 26

Abstract:

A method and apparatus for providing traffic management for distributed denial of service (DDOS) traffic. Within a communications network, a DDOS detection system monitors network traffic to identify traffic that is designed to attack a particular server within the network and their entry points into the network. A traffic routing control unit is requested to deny service to the DDOS traffic. By selectively manipulating the routing information propagated to network edge routers, the traffic that is denied service is limited to mostly DDOS traffic and is routed to a cleaning center or a null address in the most effective fashion.

US Patent:

8296458, Oct 23, 2012

Filed:

Aug 24, 2009

Appl. No.:

12/546421

Inventors:

Richard T. Kwapniewski - Middletown NJ, US
Han C. Nguyen - Marlboro NJ, US

Assignee:

AT&T Intellectual Property I, LP - Reno NV

International Classification:

G06F 15/173

US Classification:

709238, 709220

Abstract:

A system includes a plurality of cache servers and a domain name server. Each of the cache servers is configured to respond to a content request. The plurality of cache servers is divided into a plurality of subsets and configured to respond to an anycast address for each subset to which the cache server belongs. The domain name server is configured to receive a request from a requester for a cache server address, identify an anycast address for a largest available subset, and provide the anycast address of the largest available subset to the requester.