Thomas R Manning

US Patent:

6426957, Jul 30, 2002

Filed:

Dec 11, 1998

Appl. No.:

09/209526

Inventors:

Stephen A. Hauser - Burlington MA
Stephen A. Caldara - Sudbury MA
Thomas A. Manning - Northboro MA

Assignee:

Fujitsu Network Communications, Inc. - Richardson TX
Fujitsu Limited - Kanagawa-ken

International Classification:

H04L 1228

US Classification:

370413, 3703954, 370389

Abstract:

An asynchronous transfer mode (ATM) based service consolidation switch ( ) includes an input/output module ( ) having a to-switch port (TSPP) processor ( ) and a from-switch port processor (FSPP) ( ). The TSPP ( ) and the FSPP ( ) communicate with a bandwidth arbiter ( ), multipoint topology controllers ( ), and a data crossbar ( ) on a switch control module ( ). The TSPP ( ) receives traffic over links for conversion into an internal cell format. Internal cells are buffered until allowed to transfer to an appropriate FSPP ( ). Multipoint topology controllers ( ) performs translations for internal switch flow control through interactions between the TSPPs ( ), FSPPs ( ), and the bandwidth arbiter ( ). The bandwidth arbiter ( ) performs appropriate bandwidth arbitration to allow internal cells to flow from TSPPs ( ) to FSPPs ( ) over the data crossbar ( ).

US Patent:

59960191, Nov 30, 1999

Filed:

Jul 18, 1996

Appl. No.:

8/683127

Inventors:

Stephen A. Hauser - Burlington MA
Richard G. Bubenik - St. Louis MO
Stephen A. Caldara - Sudbury MA
Michael E. Gaddis - Defiance MO
Thomas A. Manning - Northboro MA
James M. Meredith - Westford MA
Raymond L. Strouble - Westford MA

Assignee:

Fujitsu Network Communications, Inc. - Richardson TX
Fujitsu Limited - Kawasaki

International Classification:

H04J 322

US Classification:

709235

Abstract:

Methods and apparatus for scheduling cell transmission over a network link by a switch. The switch includes a plurality of queues associated with each link. Lists of queues are maintained for each link. In one embodiment, each link is associated with more than one type of list (with the list type corresponding to a scheduling category) and more than one prioritized list of each type (with the priority of the list corresponding to a quality of service). The scheduling lists are accessed to permit cell transmission from a queue contained therein in a predetermined sequence as a function of scheduling category, priority within a particular scheduling category and whether the bandwidth requirement for the particular scheduling category has been met. With this arrangement, maximum permissible delay requirements for each scheduling category are met.

US Patent:

61157481, Sep 5, 2000

Filed:

Jul 18, 1996

Appl. No.:

8/683448

Inventors:

Stephen A. Hauser - Burlington MA
Stephen A. Caldara - Sudbury MA
Thomas A. Manning - Northboro MA

Assignee:

Fujitsu Network Communications, Inc. - Richardson TX
Fujitsu Limited - Kawasaki

International Classification:

G06F 1516

US Classification:

709234

Abstract:

In a link-level flow controlled system, a method and apparatus providing the ability to partition a buffer resource among multiple prioritized buffer subsets through definition of at least one threshold, the buffer resource being shared by a plurality of connections. Different category of service levels, in terms of delay bounds, are thus enabled. The presently disclosed link-level flow controlled system provides for zero cell loss. The shared buffer resource is divided among N priority pools, defined by N-1 threshold levels, each priority pool attributable to a respective category of service. Link-level counters and registers, disposed in a transmit element, as well as an indication of priority level associated with each connection, are employed in realizing the shared buffer resource.

US Patent:

60761121, Jun 13, 2000

Filed:

Mar 9, 1999

Appl. No.:

9/265440

Inventors:

Stephen A. Hauser - Burlington MA
Stephen A. Caldara - Sudbury MA
Thomas A. Manning - Northboro MA

Assignee:

Fujitsu Network Communications, Inc. - Richardson TX
Fujitsu Limited - Kawasaki

International Classification:

G06F 1300

US Classification:

709234

Abstract:

In a link-level flow controlled system, a method and apparatus providing the ability to partition a buffer resource among multiple prioritized buffer subsets through definition of at least one threshold, the buffer resource being shared by a plurality of connections. Different category of service levels, in terms of delay bounds, are thus enabled. The presently disclosed link-level flow controlled system provides for zero cell loss. The shared buffer resource is divided among N priority pools, defined by N-1 threshold levels, each priority pool attributable to a respective category of service. Link-level counters and registers, disposed in a transmit element, as well as an indication of priority level associated with each connection, are employed in realizing the shared buffer resource.

US Patent:

58503951, Dec 15, 1998

Filed:

Jul 18, 1996

Appl. No.:

8/683795

Inventors:

Stephen A. Hauser - Burlington MA
Stephen A. Caldara - Sudbury MA
Thomas A. Manning - Northboro MA
Robert B. McClure - Hollis MA

Assignee:

Fujitsu Network Communications, Inc. - Richardson TX
Fujitsu Limited - Kawasaki

International Classification:

H04J 302

US Classification:

370398

Abstract:

An asynchronous transfer mode (ATM) based service consolidation switch (10) includes an input/output module (22) having a to-switch port (TSPP) processor (90) and a from-switch port processor (FSPP) (92). The TSPP (90) and the FSPP (92) communicate with a bandwidth arbiter (114), multipoint topology controllers (116), and a data crossbar (117) on a switch control module (32). The TSPP (90) receives traffic over links for conversion into an internal cell format. Internal cells are buffered until allowed to transfer to an appropriate FSPP (92). Multipoint topology controllers (116) performs translations for internal switch flow control through interactions between the TSPPs (90), FSPPs (92), and the bandwidth arbiter (114). The bandwidth arbiter (114) performs appropriate bandwidth arbitration to allow internal cells to flow from TSPPs (90) to FSPPs (92) over the data crossbar (117).

US Patent:

61987255, Mar 6, 2001

Filed:

Mar 16, 1999

Appl. No.:

9/270574

Inventors:

Robert Constantin - Cambridge MA
David E. Hammond - Bedford NH
David N. Peck - Northbridge MA
Salma Abu-Ayyash - Cambridge MA
Stephen R. Veit - Chesterfield MO
Thomas A. Manning - Northboro MA

Assignee:

Fujitsu Network Communications, Inc. - Richardson TX

International Classification:

H04L 1228
H04L 1256

US Classification:

370235

Abstract:

A system for allocating resources at network elements along a path through a communications network. Resources are allocated at a network element along the path in response to a connection request message. The delay budget is the minimum of a calculated cell transfer delay and a calculated cell delay variation. The calculated cell transfer delay is determined by finding a difference between a target end to end cell delay and an accumulated cell delay, and then dividing that difference by a number of network elements remaining in the path between the network element and the end of the path. To determine the calculated cell delay variation, the network element first finds a difference between the Max CDV QoS parameter and the sum of the accumulated cell delay variation and the switching delay for the network element. The calculated cell delay variation is then equal to that difference divided by the number of network elements remaining in the path between the network element and the end of the path. The target end to end cell delay is for example determined by the first network element in the path as equal to the Max CTD QoS parameter minus the end to end link propagation delay for the path and the link propagation delay for the incoming link to the first network element over which the message was received.

US Patent:

58899561, Mar 30, 1999

Filed:

Jul 18, 1996

Appl. No.:

8/683349

Inventors:

Stephen A. Hauser - Burlington MA
Richard G. Bubenik - St. Louis MO
Stephen A. Caldara - Sudbury MA
Thomas A. Manning - Northboro MA

Assignee:

Fujitsu Network Communications, Inc. - Richardson TX
Fujitsu Limited - Kawasaki

International Classification:

G06F 1700

US Classification:

39520056

Abstract:

A system for managing resources such as buffers and bandwidth which are allocated to competing entities through two or more levels in a telecommunications network is disclosed. The system provides a tool to allocate resources for use by individual entities. Each entity may be assigned a Minimum. sub. -- Guaranteed variable and a Maximum. sub. -- Allowed variable. When an entity requests resources the system determines if the entity is using its respective minimum guaranteed resource allocation which is specified by the Minimum. sub. -- Guaranteed variable. If the entity is not using its respective minimum guaranteed resource allocation, the system allocates a resource unit to the requesting entity. The system also allows a requesting entity to use additional resource units above the resource allocation specified by the Minimum. sub. -- Guaranteed variable, provided such resource units are available.

US Patent:

59832606, Nov 9, 1999

Filed:

Jul 18, 1996

Appl. No.:

8/683792

Inventors:

Stephen A. Hauser - Burlington MA
Stephen A. Caldara - Sudbury MA
Thomas A. Manning - Northboro MA
Robert B. McClure - Hollis MA

Assignee:

Fujitsu Network Communications, Inc. - Richardson TX
Fujitsu Limited - Kawasaki

International Classification:

G06F 1300
G06F 1320

US Classification:

709201

Abstract:

A communication device (10) includes a number of input/output modules (12) coupled to a switch control module (14) using an interconnect (40) and to a redundant switch control module (16) using a redundant interconnect (42). Each interconnect (40) and redundant interconnect (42) includes a control interconnect (44) and a data interconnect (46). The control interconnect (44) establishes control information for transferring a cell in the communication device (10) and the data interconnect (46) performs the cell transfer.