Jonathan Gregg Shapiro

US Patent:

7983239, Jul 19, 2011

Filed:

Jan 7, 2004

Appl. No.:

10/752988

Inventors:

Joseph J. Weinstein - Somerville MA, US
Vladimir Rosenzweig - Belmont MA, US
Isidro Marcos Castineyra - Somerville MA, US
Jonathan Shapiro - Framingham MA, US

Assignee:

Raytheon BBN Technologies Corp. - Cambridge MA

International Classification:

G01R 31/08
H04L 12/28

US Classification:

370351, 370238, 370397

Abstract:

A system constructs an OSPF-compatible virtual model of a multi-hop, multi-access packet radio network that includes a plurality of routers () and which includes its own private, internal routing system (), in order to facilitate the incorporation of that packet radio network into an overall OSPF routing environment. The system determines a network graph identifying actual connectivity among the plurality of routers (). The system constructs a virtual model () of the, wherein connectivity of the virtual model may be different than the actual connectivity of the network graph. The system represents the multi-hop, multi-access radio network in the virtual model as a set of multi-access links (), point-to-point links, AS-external routes, and area summary routes. The system employs the virtual model for routing purposes and advertises the virtual model to other OSPF routers for the same purpose.

US Patent:

20040246902, Dec 9, 2004

Filed:

Mar 11, 2004

Appl. No.:

10/797030

Inventors:

Joseph Weinstein - Somerville MA, US
Vladimir Rosenzweig - Belmont MA, US
Joseph Keller - Ledyard CT, US
Jonathan Shapiro - Framingham MA, US
David Pearson - Bennington VT, US

International Classification:

H04L012/26
G06F011/00
H04J001/16
H04J003/14

US Classification:

370/238000

Abstract:

A system uses database digests to synchronize routing data in a network (). The system includes a first node (-) and a second node (-). The first node (-) stores first routing data and the second node (-) stores second routing data. The second node (-) further performs a function on a portion of the second routing data, where the function produces a database digest that has substantially less data than the portion of the second routing data. The second node (-) also sends the database digest to the first node (-) to synchronize the second routing data with the first routing data.

US Patent:

58782486, Mar 2, 1999

Filed:

Jun 11, 1996

Appl. No.:

8/661571

Inventors:

Michael Tehranian - Boxboro MA
Brian Martin - Worcester MA
Michael Giancioppo - Natick MA
Jonathan Shapiro - Framingham MA
Sheldon P. Gringorten - Framingham MA
Paul D. Linton - Lexington MA

Assignee:

Data General Corporation - Westboro MA

International Classification:

G06F 1516

US Classification:

395502

Abstract:

A device access controller residing in a first computer system for transferring virtual inputs and outputs representing operations of the first system between the first system and a second system. The device access controller includes a video controller for performing video display operations, a video memory for storing video data representing operations of the first system, a network controller for transferring information between the first system and the second system, a controller processor, and a device access controller bus interconnecting the video controller, the network controller and the processor. A video interface is connected between the first system bus and the device access controller bus for receiving video information including video data and video write addresses from the first system bus and into the video memory and controller and the controller processor and network controller are responsive to the writing of video data into the video memory for reading the video information including the video data from the video memory and the video data write addresses from the video controller registers and transmitting the video information including the video data and the video data write addresses to the second system. The device access controller further includes a keyboard interface, a disk interface, and a serial interface operating in manners generally analogous to the video interface for corresponding communicating corresponding data between the first and second systems.