Joseph M Rash

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:

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:

60353600, Mar 7, 2000

Filed:

Oct 29, 1997

Appl. No.:

8/960382

Inventors:

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

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 1300

US Classification:

710107

Abstract:

A memory interface for multi-port access to a memory unit, such as a static random-access memory (SRAM) device. The memory interface, which is generally adapted for a local area network (LAN) forwarding engine, provides single port read/write access to SRAM device, and arbitrates requests from the access interfaces to allocate bandwidth of the SRAM device among the requests. One embodiment allocates at least 50% of the bandwidth to a peripheral component interface (PCI) bus target interface and a PCI bus master interface, collectively. The arbitration logic may include a plurality of bandwidth control registers associated with respective access interfaces used to determine a permitted amount of bandwidth that an access interface is to have, wherein a request from an access interface is masked based on a value in its associated bandwidth control register. Arbitration can further allocate bandwidth using time division multiplexing.

US Patent:

58782290, Mar 2, 1999

Filed:

Nov 12, 1997

Appl. No.:

8/968677

Inventors:

Brian M. Bass - Apex NC
Edward Hau-chun Ku - Cary NC
Scott J. Lemke - Raleigh NC
Joseph M. Rash - Wake Forest NC
Loren Blair Reiss - Raleigh NC

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 1338
G06F 1314
H04Q 1104

US Classification:

39520066

Abstract:

A sequence in which two or more of the data units enter the network node, via a specific one of the multiple ports, is recorded. And, the two or more of the data units are transmitted from the network node according to the recorded sequence. The method and system achieve the recording of sequence via the following. In response to an insertion of one of the two or more data units into a specific one of the multiple processor subsystems, the specific one of the multiple processor subsystems is associated with a specific one of the multiple ports by which the one of the two or more data units entered the network node, and any other of the multiple processor subsystems that are currently processing on any other of the two or more data units that entered the network node through the specific one of the multiple ports is noted. Thereafter, any request to transmit by the specific one of the multiple processors is honored if it is determined that the data unit with the requesting processor is next according to the recorded sequence. The data unit is determined to be next in sequence if all of the multiple processors, that were processing on other data units which entered through the specific one of the multiple ports, have completed processing.