David H Chen

US Patent:

6353593, Mar 5, 2002

Filed:

Jun 3, 1999

Appl. No.:

09/325495

Inventors:

David X. Chen - Plano TX
Ted D. Chang - Richardson TX
Rupert R. Zhu - Richardson TX
Edward Y. Qian - Plano TX

Assignee:

Fujitsu Network Communications, Inc. - Richardson TX

International Classification:

H04J 116

US Classification:

370216, 370218, 370228

Abstract:

A method for protecting virtual channel connection (VCC) traffic in a telecommunications system includes receiving a virtual path connection (VPC) at a destination node. The virtual path connection (VPC) is received on each of a working transmission link and a protection transmission link. The virtual path connection (VPC) includes a plurality of virtual channel connections (VCCs) A protection switching status is received for the working and protection transmission links. The virtual channel connections (VCCs) are selected from the working and protection transmission links for processing by selecting the virtual path connection (VPC) from one of the working and protection links based on the protection switching status for at least one of the working and protection transmission links.

US Patent:

6359858, Mar 19, 2002

Filed:

Jun 3, 1999

Appl. No.:

09/324948

Inventors:

Alexander Smith - Carrollton TX
Masahiro Shinbashi - Kanagawa, JP
Edward Qian - Plano TX
Daniel Joseph Mieczkowski - Allen TX
David Chen - Plano TX

Assignee:

Fujitsu Network Communications, Inc. - Richardson TX

International Classification:

G06F 1516

US Classification:

370217, 370219, 370352, 370401, 379279, 709249

Abstract:

An apparatus and method for switching redundancy control which provides fast switching from a malfunctioning component to a redundant component with minimum data flow interruption for both transmitted and received data. The redundancy control system having an APS (Automatic Switching Protection) Hub, at least a working and a redundant tributary card, a bridge to provide identical traffic to the working and redundant tributary cards, a working and a redundant STM switching fabric, selectors within the working and redundant STM switching fabrics for selecting the traffic from the working tributary card to further process, a working and a redundant ATM switching fabric, a working and a redundant ATM processor and ATM selectors for selecting traffic needing cell switching from the working STM switching fabric to process further. The system is capable of monitoring itself to detect failures and the APS Hub is outfitted so as to become aware of detected failures and initiate a switch in the appropriate selectors or ATM selectors so as to change the traffic being further processed from the failed working component to the redundant component.

US Patent:

6366370, Apr 2, 2002

Filed:

Dec 29, 1999

Appl. No.:

09/474361

Inventors:

Mark E. Holzbach - Austin TX
David T. Chen - West Somerville MA

Assignee:

Zebra Imaging, Inc. - Pflugerville TX

International Classification:

G03H 126

US Classification:

359 23, 345427, 345619, 345620, 345621, 345622, 345623, 345624, 348 40, 348 42

Abstract:

A method of rendering image data for full parallax autostereoscopic displays. The method is based on a double frustrum camera technique, where two cameras provide image data from opposing sides of an image plane. The near clipping plane is located on the image plane. The distance between the near clipping plane and the eyepoint of the camera frustra is adjusted to minimize or avoid clipping.

US Patent:

6396847, May 28, 2002

Filed:

Jun 3, 1999

Appl. No.:

09/324721

Inventors:

Hamid Rezaie - Dallas TX
Samuel Lisle - Allen TX
Masahiro Shinbashi - Kamagawa, JP
Kazuhiko Taniguchi - Kanagawa, JP
David Chen - Plano TX
Edward Sullivan - Highland Village TX
Mark Barratt - Lucas TX
Richard DeBoer - Manotick, CA

Assignee:

Fujitsu Networks Communications, Inc. - Richardson TX

International Classification:

H04J 316

US Classification:

370468, 370376, 3703951, 370541, 370535

Abstract:

A communications device and method for effectively managing bandwidth within a telecommunications network carrying both time division multiplexed signals as well as data signals. The communications device having dialable TDM/cell and/or packet-based bandwidth management capability so that a network operator can select to manage bandwidth for any particular signal on in STS, VT, or cell or packet basis.

US Patent:

6498792, Dec 24, 2002

Filed:

Jun 3, 1999

Appl. No.:

09/325689

Inventors:

Gary P. Johnson - McKinney TX
Roland J. Moubarak - Garland TX
Masahiro Shimbashi - Kawasaki, JP
Katsuya Shirota - Richardson TX
David X. Chen - Plano TX

Assignee:

Fujitsu Network Communications, Inc. - Richardson TX

International Classification:

H04L 1250

US Classification:

370388, 370466, 370376

Abstract:

A telecommunications switching apparatus ( ) includes optical paths ( ) coupled to interface cards ( ), which in turn are coupled to a switching circuit ( ). The switching circuit is coupled to a plurality of universal connectors ( ), each of which is coupled to an auxiliary connector ( ). The universal connectors can each removably receive any one of several types of switching circuit cards ( ), which each utilize a respective one of several different communication protocols. An auxiliary circuit card ( ) may be provided in the associated auxiliary connector, in order to support switching circuit cards that use certain communication protocols. The optically transmitted information includes segments formatted according to respective communication protocols, and is converted from optical to electrical form by the interface cards. The switching circuit then routes each segment to a respective universal connector containing a switching circuit card that effects switching according to the communication protocol of that segment.

US Patent:

6501758, Dec 31, 2002

Filed:

Jun 3, 1999

Appl. No.:

09/326141

Inventors:

David X. Chen - Plano TX
Edward T. Sullivan - Highland Village TX

Assignee:

Fujitsu Network Communications, Inc. - Richardson TX

International Classification:

H04L 1264

US Classification:

3703951, 370354, 370466

Abstract:

A method of transporting asynchronous transfer mode cells and time-division multiplexed information over a common fiber ring includes receiving a plurality of incoming signals comprising asynchronous transfer mode cells, legacy data, or time-division multiplexed information, formatting the plurality of incoming signals into a first plurality of incoming transport signals comprising asynchronous transfer mode cells and a second plurality of incoming transport signals comprising time-division multiplexed information, constructing from the first plurality of incoming transport signals a first outgoing synchronous transfer mode signal comprising at least one asynchronous transfer mode cell, constructing from the second plurality of incoming transport signals a second outgoing synchronous transfer mode signal comprising time-division multiplexed information, and transmitting the first and second outgoing synchronous transfer mode signals over a common fiber ring.

US Patent:

6584119, Jun 24, 2003

Filed:

Sep 18, 2001

Appl. No.:

09/955880

Inventors:

Hamid Rezaie - Dallas TX
Samuel Lisle - Allen TX
Masahiro Shinbashi - Kamagawa, JP
Kazuhiko Taniquchi - Kanagawa, JP
David Chen - Plano TX
Edward Sullivan - Highland Village TX
Mark Barratt - Lucas TX
Richard DeBoer - Manotick, CA

Assignee:

Fujitsu Network Communications, Inc. - Richardson TX

International Classification:

H04J 316

US Classification:

370468, 370376, 3703951, 370541, 370535

Abstract:

A communications device and method for effectively managing bandwidth within a telecommunications network carrying both time division multiplexed signals as well as data signals. The communications device having dialable TDM/cell and/or packet-based bandwidth management capability so that a network operator can select to manage bandwidth for any particular signal on in STS, VT, or cell or packet basis.

US Patent:

6658006, Dec 2, 2003

Filed:

Jun 3, 1999

Appl. No.:

09/326142

Inventors:

David X. Chen - Plano TX
Edward T. Sullivan - Highland Village TX
Alexander A. Smith - Carrollton TX
Gary F. Chard - Richardson TX

Assignee:

Fujitsu Network Communications, Inc. - Richardson TX

International Classification:

H04L 1256

US Classification:

3703951, 370392

Abstract:

A system includes a communication device that includes a number of interface cards and a switching complex. Upon receiving a data signal, an input card modifies header bits of the data signal to identify an input port on which the data signal was received. The switching complex uses the modified header bits to communicate the data signal to an output card and associated output port. In a particular embodiment, the switching complex may also modify header bits to identify the input card.