Pravin K Johri

US Patent:

6463062, Oct 8, 2002

Filed:

Dec 23, 1998

Appl. No.:

09/219319

Inventors:

Cagatay Buyukkoc - Holmdel NJ
David J. Houck - Colts Neck NJ
Pravin Kumar Johri - Aberdeen NJ
Steven M. Michelson - Freehold NJ
Rodolfo Alberto Milito - Piscataway NJ

Assignee:

ATT Corp. - New York NY

International Classification:

H04J 324

US Classification:

3703951, 370401, 370409, 370471

Abstract:

A method is provided for setting up a communication from a first edge node, across a network that uses direct virtual path routing, to a second edge node. The first edge node receives a request to set up the communication. The second edge node is identified as the destination of the communication, based on the request. A first virtual path identifier (VPI) is obtained that defines a first path from the first edge node across the network to the second edge node. A second VPI is obtained that defines a second path from the second edge node across the network to the first edge node. The first and second VPIs are selected by a routing status database. A first virtual channel identifier (VCI) within the first VPI is selected. A second virtual channel identifier (VCI) within the second VPI is selected. Data is transmitted from the first edge node to the second edge node using the first VPI and first VCI, and from the second edge node to the first edge node using the second VPI and second VCI.

US Patent:

7002963, Feb 21, 2006

Filed:

Sep 3, 2002

Appl. No.:

10/233739

Inventors:

Cagatay Buyukkoc - Holmdel NJ, US
David J Houck - Colts Neck NJ, US
Pravin Kumar Johri - Aberdeen NJ, US
Steven M. Michelson - Freehold NJ, US
Rodolfo Alberto Milito - Los Gatos CA, US

Assignee:

AT&T Corp. - Bedminster NJ

International Classification:

H04L 12/56

US Classification:

3703951, 3703953, 37039552, 370401, 370409

Abstract:

The problems associated with prior solutions for implementing ATM or IP/MPLS in a large-scale network are overcome by providing an efficient means by which capacity in the network is more fully shared without adversely affecting call or session setup latency, and at the same time simplifying network operations. This is achieved by performing the functions of route setup, route allocation, and capacity management in a network at the edges (e. g. , the interfaces existing between each ATM switch or IP/MPLS router and customers) of the network. In accordance with the principles disclosed herein, the edges contain nodes that form the interface between the ATM switches and IP/MPLS routers and the link(s) that interconnect them and the outside world. These nodes comprise controllers and other apparatus that in some cases may be incorporated in, or connected as adjuncts to, the ATM switches or IP/MPLS routers.

US Patent:

7130262, Oct 31, 2006

Filed:

Jan 16, 2002

Appl. No.:

10/047969

Inventors:

Bruce Gilbert Cortez - Marlboro NJ, US
Sanja Durinovic-Johri - Aberdeen NJ, US
Pravin Kumar Johri - Aberdeen NJ, US

Assignee:

AT & T Corp. - Bedminster NJ

International Classification:

H04L 1/00

US Classification:

370216, 370252, 370238

Abstract:

A data network wherein network links have an assigned service weight and a restoration weight that are used as factors for respectively determining an optimum primary data path and a back-up data path through the network. The restoration path is used in the event of a failure of the primary service path and a Dijkstra or similar algorithm may be used for determining these paths. Service weights may be assigned to the links to prioritize finding the shortest possible path, whereas restoration weights may be assigned to the links to find a path with the maximum available capacity.

US Patent:

7158524, Jan 2, 2007

Filed:

Dec 30, 2005

Appl. No.:

11/322836

Inventors:

Cagatay Buyukkoc - Holmdel NJ, US
David J Houck - Colts Neck NJ, US
Pravin Kumar Johri - Aberdeen NJ, US
Steven M. Michelson - Freehold NJ, US
Rodolfo Alberto Milito - Los Gatos CA, US

Assignee:

AT&T Corp. - New York NY

International Classification:

H04L 12/56

US Classification:

3703951, 3702953, 370401, 370409

Abstract:

A method and apparatus is provided for setting up an IP session from a first node, across a network that uses direct virtual path routing, to a second node. The first node receives a request to set up the session. The second node is identified as the destination of the session, based on the request. A first stack of labels is obtained that defines a first path. A second stack of labels is obtained that defines a second path. A first label identifier is selected that identifies the session in a first direction. A second label identifier is selected that identifies the session in a second direction. Finally the data is transmitted from the first node to the second node and from the second node to the first node using the first stack and second stack of labels and label identifiers, respectively.

US Patent:

7164653, Jan 16, 2007

Filed:

Jun 7, 2002

Appl. No.:

10/165816

Inventors:

Teddy Bezoza - Marlboro NJ, US
Bruce Gilbert Cortez - Marlboro NJ, US
Sanja Durinovic-Johri - Aberdeen NJ, US
Karel Ehrlich - Fair Haven NJ, US
Pravin Kumar Johri - Aberdeen NJ, US

Assignee:

AT&T Corp. - New York NY

International Classification:

G01R 31/08

US Classification:

370228, 37039521, 370468

Abstract:

A method and a system for allocating restoration capacity in a network link in a communications network provides that a common pool of communication capacity is provisioned in a network link, such that the common pool of communication capacity includes spare capacity for new service and restoration capacity. A pool of pre-allocated communication capacity for future growth of at least one connection in the network link is also provisioned. The pool of pre-allocated communication capacity for future growth is available for restoration capacity, but not for spare capacity for new service. The communications network can be, for example, a private line (PL) network, a SONET-based network, an Asynchronous Transfer Mode (ATM)-based network, an Internet Protocol/MultiProtocol Label Switching (IP/MPLS)-based network or a frame relay (FR)-based network.

US Patent:

7242679, Jul 10, 2007

Filed:

Oct 28, 2002

Appl. No.:

10/281750

Inventors:

Bruce Gilbert Cortez - Marlboro NJ, US
Sanja Durinovic-Johri - Aberdeen NJ, US
Pravin Kumar Johri - Aberdeen NJ, US
James H. King - Red Bank NJ, US

Assignee:

AT&T Corp. - New York NY

International Classification:

H04L 12/28

US Classification:

370351

Abstract:

The present invention relates generally to routing of circuits in a network. More particularly, the invention encompasses a method and an apparatus for routing circuits using dynamic self-adjusting link weights within a network. The invention further includes multiple schemes for routing circuits with dynamic self-adjusting link weights in a SCN (Switched Communication Network). The network could consist of optical, ATM, FR, or IP/MPLS switches and cross-connects.

US Patent:

7295510, Nov 13, 2007

Filed:

Dec 17, 2002

Appl. No.:

10/321082

Inventors:

Pravin K. Johri - Aberdeen NJ, US

Assignee:

AT&T Corporation - Bedminster NJ

International Classification:

G01R 31/08

US Classification:

370216, 370225

Abstract:

A method for estimating restoration capacity for a communication network includes a specified number of restoration paths, which can be maximally diverse from each other.

US Patent:

7298695, Nov 20, 2007

Filed:

Mar 3, 2003

Appl. No.:

10/378388

Inventors:

Bruce Gilbert Cortez - Marlboro NJ, US
Sanja Durinovic-Johri - Aberdeen NJ, US
Pravin Kumar Johri - Aberdeen NJ, US
John Paggi - Bayville NJ, US
Simon S Zelingher - Morganville NJ, US

Assignee:

AT&T Corp. - New York NY

International Classification:

H04J 1/16

US Classification:

370218, 370244, 714 2

Abstract:

The present invention relates generally to restoration of low priority services in a network. More particularly, the invention encompasses a method and an apparatus for delaying the start of the restoration of low priority services in a communication network. The invention further includes multiple schemes for restoring low priority services. The network could consist of optical, ATM, FR, or IP/MPLS switches and cross-connects.