Chikong Shue

US Patent:

6452901, Sep 17, 2002

Filed:

Feb 8, 2000

Appl. No.:

09/500389

Inventors:

Tao Yang - Belleville, CA
Chikong Shue - Andover MA
Mohamed Abdelaziz - Lowell MA

Assignee:

Cascade Communications Corporation - Westford MA

International Classification:

H04L 1226

US Classification:

370231, 370235, 3703951, 370412, 709232

Abstract:

A switching node for use in connection with a computer network includes an input interface, a buffer and a control element. The input interface receives cells from at least one input communication link. The buffer buffers selected cells prior to transmission over at least one output communication link. The control element selectively enables cells received by said input interface to be buffered in said buffer. The control element discards cells if the cell occupancy of the buffer exceeds a predetermined threshold level and a credits value indicates that the switching node has loaded a number of cells into the buffer for transmission which exceeds a cell loss ratio guarantee provided by the switching node.

US Patent:

6862564, Mar 1, 2005

Filed:

Oct 26, 2000

Appl. No.:

09/696860

Inventors:

Chikong Shue - Andover MA, US
John Thomas Moy - Acton MA, US
Tao Yang - Acton MA, US
Raymond Xie - Westford MA, US

Assignee:

Sycamore Networks, Inc. - Chelmsford MA

International Classification:

G06F013/00

US Classification:

703 25, 703 27, 709243, 370395

Abstract:

A system and a method for providing an emulated network including a plurality of emulated networking devices, in which a number of network node executable images are employed. Each of the network node executable images corresponds to one of the emulated networking devices. The emulated networking devices represent physical networking devices, such as optical switches. A portion of each of the network node executable images is operable to execute without modification on a physical networking device. Each of the network node executable images includes a number of program components, such as a topology related program component for maintaining a representation of the topology of the emulated network, a trunk manager program component for maintaining at least one emulated trunk between the corresponding emulated networking device and an adjacent other emulated networking device, and a circuit manager program component operable to maintain at least one emulated circuit between the corresponding emulated networking device and another one of the emulated networking devices. Various numbers of network node executable images may be executed on a single emulator machine, and multiple emulator machines may be employed to execute a single network node executable image.

US Patent:

60976985, Aug 1, 2000

Filed:

Dec 16, 1996

Appl. No.:

8/768110

Inventors:

Tao Yang - Belleville, CA
Chikong Shue - Andover MA
Mohamed Abdelaziz - Lowell MA

Assignee:

Cascade Communications Corporation - Westford MA

International Classification:

H04L 1226
H04L 1256

US Classification:

370231

Abstract:

A switching node for use in connection with a computer network includes an input interface, a buffer and a control element. The input interface receives cells from at least one input communication link. The buffer buffers selected cells prior to transmission over at least one output communication link. The control element selectively enables cells received by the input interface to be buffered in the buffer. The control element discards cells if the cell occupancy of the buffer exceeds a predetermined threshold level and a credit value indicates that the switching node has loaded a number of cells into the buffer for transmission which exceeds a cell loss ratio guarantee provided by the switching node.

US Patent:

62228455, Apr 24, 2001

Filed:

Feb 25, 1997

Appl. No.:

8/806583

Inventors:

Chikong Shue - Andover MA
Jonathan B. West - Northborough MA
James A. Martel - Wellesley MA

Assignee:

Cascade Communications Corp. - Westford MA

International Classification:

H04L 1228
H04L 1256

US Classification:

370400

Abstract:

A network for transferring information among a plurality of digital devices includes a plurality of switching nodes interconnected by communication links. Each of the digital devices is connected to one of the switching nodes over additional ones of communication links. Each communication link transfers information in a predetermined one of a plurality of types of communications services, with the network including at least one communication link of each service type. The digital devices and switching nodes transfer information through the network over virtual circuits, with each virtual circuit extending from one digital device, as an originating digital device, to another digital device, as a terminating digital device. Each virtual circuit defines a unitary virtual circuit path extending through at least one switching node over a plurality of the communication links without regard to the service type of the ones of the communication links included in the virtual circuit path.