Edward Hc Ku

US Patent:

6944164, Sep 13, 2005

Filed:

Oct 31, 2003

Appl. No.:

10/698248

Inventors:

Dennis Albert Doidge - Apex NC, US
Jim P. Ervin - Raleigh NC, US
Douglas Ray Henderson - Raleigh NC, US
Edward Hau-chun Ku - Cary NC, US
Pramod Narottambhai Patel - Cary NC, US
Loren Blair Reiss - Raleigh NC, US
Thomas Eric Ryle - Raleigh NC, US
Joseph M. Rash - Wake Forest NC, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H04L012/28
H04J003/34

US Classification:

37039553, 370474

Abstract:

A multiported LAN switch comprised of legacy local area network ports and ATM ports. Each ATM port comprising a hardware forwarding engine for bridging LAN frames from the LAN ports to the ATM port. The hardware forwarding engine converts layer protocols between the dissimilar ports expediently, without requiring intervention by a microprocessor. A substantial performance gain is attained compared to microprocessor controlled format converters. Both LAN emulation and virtual LANs are supported.

US Patent:

6970468, Nov 29, 2005

Filed:

Oct 31, 2003

Appl. No.:

10/698684

Inventors:

Dennis Albert Doidge - Apex NC, US
Jim P. Ervin - Raleigh NC, US
Douglas Ray Henderson - Raleigh NC, US
Edward Hau-chun Ku - Cary NC, US
Pramod Narottambhai Patel - Cary NC, US
Loren Blair Reiss - Raleigh NC, US
Thomas Eric Ryle - Raleigh NC, US
Joseph M. Rash - Wake Forest NC, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H04L012/28
H04J003/16

US Classification:

3703951, 370412, 370466

Abstract:

A multiported LAN switch comprised of legacy local area network ports and ATM ports. Each ATM port comprising a hardware forwarding engine for bridging LAN frames from the LAN ports to the ATM port. The hardware forwarding engine converts layer 2 protocols between the dissimilar ports expediently, without requiring intervention by a microprocessor. A substantial performance gain is attained compared to microprocessor controlled format converters. Both LAN emulation and virtual LANs are supported.

US Patent:

7403532, Jul 22, 2008

Filed:

Dec 22, 2004

Appl. No.:

11/020461

Inventors:

Dennis Albert Doidge - Apex NC, US
Jim P. Ervin - Raleigh NC, US
Douglas Ray Henderson - Raleigh NC, US
Edward Hau-chun Ku - Cary NC, US
Pramod Narottambhai Patel - Cary NC, US
Loren Blair Reiss - Raleigh NC, US
Thomas Eric Ryle - Raleigh NC, US
Joseph M. Rash - Wake Forest NC, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H04L 12/56

US Classification:

37039553, 370474, 370466

Abstract:

A multiported LAN switch comprised of legacy local area network ports and ATM ports. Each ATM port comprising a hardware forwarding engine for bridging LAN frames from the LAN ports to the ATM port. The hardware forwarding engine converts layer protocols between the dissimilar ports expediently, without requiring intervention by a microprocessor. A substantial performance gain is attained compared to microprocessor controlled format converters. Both LAN emulation and virtual LANs are supported.

US Patent:

20040090967, May 13, 2004

Filed:

Oct 31, 2003

Appl. No.:

10/698287

Inventors:

Dennis Doidge - Apex NC, US
Jim Ervin - Raleigh NC, US
Douglas Henderson - Raleigh NC, US
Edward Ku - Cary NC, US
Pramond Patel - Cary NC, US
Loren Reiss - Raleigh NC, US
Thomas Ryle - Raleigh NC, US
Joseph Rash - Wake Forest NC, US

International Classification:

H04L012/28

US Classification:

370/395530, 370/474000

Abstract:

A multiported LAN switch comprised of legacy local area network ports and ATM ports. Each ATM port comprising a hardware forwarding engine for bridging LAN frames from the LAN ports to the ATM port. The hardware forwarding engine converts layer 2 protocols between the dissimilar ports expediently, without requiring intervention by a microprocessor. A substantial performance gain is attained compared to microprocessor controlled format converters. Both LAN emulation and virtual LANs are supported.

US Patent:

57969647, Aug 18, 1998

Filed:

Jan 16, 1996

Appl. No.:

8/586409

Inventors:

Brian Mitchell Bass - Apex NC
Douglas Ray Henderson - Raleigh NC
Karen Park Heron - Raleigh NC
Jeffrey Wayne Kidd - Cary NC
Edward Hau-chun Ku - Cary NC
Charles Steven Lingafelt - Durham NC
Loren Blair Reiss - Raleigh NC

Assignee:

International Business Machines - Armonk NY

International Classification:

G06F 1314

US Classification:

395308

Abstract:

A method for improving the performance of an existing busoriented computer system with minimum or no design change to the existing hardware, bus protocol, or bus operation is disclosed. Specifically, the present invention improves the effective bandwidth of an existing bus architecture by creating multiple physical instantiations of the existing bus and directing traffic onto these different buses based on the type of bus operation being performed. This results in multiple components having the capability to simultaneously perform bus operations, therefore improving the effective bandwidth of the system. This invention also allows the components which are current being utilized in the existing bus architecture to be re-utilized with minimum additional external logic.

US Patent:

60646748, May 16, 2000

Filed:

Oct 22, 1997

Appl. No.:

8/956077

Inventors:

Dennis Albert Doidge - Apex NC
Jim P. Ervin - Raleigh NC
Douglas Ray Henderson - Raleigh NC
Edward Hau-chun Ku - Cary NC
Pramod Narottambhai Patel - Cary NC
Loren Blair Reiss - Raleigh NC
Thomas Eric Ryle - Raleigh NC
Joseph M. Rash - Wake Forest NC

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H04L 1228
H04L 1256
H04J 316
H04J 322

US Classification:

370398

Abstract:

A multiported LAN switch comprised of legacy local area network ports and ATM ports. Each ATM port comprising a hardware forwarding engine for bridging LAN frames from the LAN ports to the ATM port. The hardware forwarding engine converts layer 2 protocols between the dissimilar ports expediently, without requiring intervention by a microprocessor. A substantial performance gain is attained compared to microprocessor controlled format converters. Both LAN emulation and virtual LANs are supported.

US Patent:

62721348, Aug 7, 2001

Filed:

Nov 20, 1997

Appl. No.:

8/975231

Inventors:

Brian M. Bass - Apex NC
Douglas R. Henderson - Raleigh NC
Edward Hau-chun Ku - Cary NC
Scott J. Lemke - Raleigh NC
Joseph M. Rash - Wake Forest NC
Loren Blair Reiss - Raleigh NC
Thomas Eric Ryle - Raleigh NC

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H04L 1256

US Classification:

370390

Abstract:

A method and system are provided for increasing processing efficiency associated with data frames transiting a network node having multiple ports. The method and system accomplish their objects via the following. A data frame having a header and data is received. An associated pointer for at least one portion of the received data frame is provided. The associated pointer is provided by segmenting each received data frame into parts, and associating with each segmented part a pointer. Thereafter, a portion of the received data frame is modified independent of other portions of the received data frame via utilization of given one or more of the associated pointers. Additionally, one or more copies of a portion (which can include the whole) of the received data frame is constructed by recalling each segmented part associated with one or more selected ones of the associated pointers. Furthermore, a determination is made as to whether the received header indicates unicast or multicast. In response to this determination, a number of data frames are constructed commensurate with protocols and destination addresses of one or more network nodes to which the constructed number of data frames is to be transmitted.

US Patent:

6137797, Oct 24, 2000

Filed:

Nov 27, 1996

Appl. No.:

8/757867

Inventors:

Brian Mitchell Bass - Apex NC
Jack S. Chorpenning - Cary NC
Douglas R. Henderson - Raleigh NC
Edward Hau-Chun Ku - Cary NC
Kenneth H. Potter - Raleigh NC
Sidney B. Schrum - Durham NC
Michael Steven Siegel - Raleigh NC
Norman Clark Strole - Raleigh NC

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H04J 1228
H04J 1246

US Classification:

370392

Abstract:

A device for interconnecting Local Area Networks (LANs) includes ports for attaching LAN segments and port modules for connecting the ports to a switch fabric. Each of the port modules include a mechanism which searches the Routing Information (RI) field of a Received frame to detect at least two Triplets (a minimum configuration for a LAN segment) indicating a Source path from an originator user and a Destination path to a destination user. The Triplet (single or in combination) is used to access a database (tables) which identifies the Port of Exit (POE) through which the frame is to be routed.