STEPHEN A CALDARA
Broker in North Sudbury, MA

5235685, Aug 10, 1993

May 11, 1989

7/350331

Stephen A. Caldara - Sudbury MA
John R. McDaniel - Rochester NH
Kenneth S. Goekjian - Candia NH
Donald J. Barbarits - Durham NH
Salvatore Faletra - Somersworth NH
John E. Shur - Stratham NH

Data General Corp. - Westboro MA

G06F 1300

395325

A data processing system is disclosed in which a plurality of high performance, intelligent, mass storage input-output devices are linked to a host controller by an input-output interface bus which is divided into three sections. Each section is completely independent of the other two sections and used for a different and specific purpose. One section is used to transfer commands and retrieve status information. A second section is used to handle device requests for data transfer and device signals for operation complete. The third section is used to transfer data to and from a device. Since the three sections are completely independent, simultaneous transfer of command control and data to different input-output devices or to a single input-output device can be performed.

6426957, Jul 30, 2002

Dec 11, 1998

09/209526

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

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

H04L 1228

370413, 3703954, 370389

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 ( ).

6539025, Mar 25, 2003

Mar 11, 1999

09/268500

Thomas A. Manning - Northboro MA
Stephen A. Caldara - Sudbury MA
Stephen A. Hauser - Burlington MA
Matthias L. Colsman - Cologne, DE

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

H04L 1228

370414, 370235

An Asynchronous Transfer Mode switch and method which facilitate priority arbitration of point-to-point and point-to-multipoint transmission are disclosed. To execute point-to-multipoint operation a bandwidth arbiter maintains a first list of connections and bit vectors indicating designated destination ports. The list maintained by the bandwidth arbiter is then compared to an unassigned output port bit vector to determine matches therebetween at which point-to-multipoint transmission may be made by utilizing instantaneously unused bandwidth within the switch. To execute point-to-point operation each input port maintains a list of connections associated with each output port, and those lists are used in conjunction with output port request information per input port in the bandwidth arbiter to match requests to the unassigned output port bit vector. The bandwidth arbiter may also assign priority to connections in the list.

5748629, May 5, 1998

Jul 18, 1996

8/683152

Stephen A. Caldara - Sudbury MA
Stephen A. Hauser - Burlington MA
Thomas A. Manning - Northboro MA
Robert B. McClure - Hollis NH
Matthias L. Colsman - Cologne, DE

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

H04J 322

370389

An ATM network switch and method of utilization for adaptively providing integrated services therein is disclosed. In providing such integrated services, if the allocated bandwidth for one connection has been consumed, or if the connection is not entitled to allocated bandwidth, the connection can optionally use dynamic bandwidth arbitration, or a combination of both allocated and dynamic. The switch includes an input port processor, a bandwidth arbiter, and an output port processor. Cells are transmitted from the input to the output, under the control of respective port processors and the bandwidth arbiter. Flow control is implemented on a per-connection basis. Individual queues are then assigned to traffic type groups in order to provide traffic type flow control. Based upon prioritization information associated with the cell at the input, cells are prioritized and transmitted from the output, with each cell maintained in the same order, relative to other cells on a connection, in which it was received.

5896511, Apr 20, 1999

Jul 18, 1996

8/685241

Thomas A. Manning - Northboro MA
Stephen A. Caldara - Sudbury MA
Stephen A. Hauser - Burlington MA
Douglas H. Hunt - Sudbury MA
Raymond L. Strouble - Westford MA

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

G06F 1300

39520062

A method and apparatus for providing buffer state accounting at a link level, otherwise known as link flow control, in addition to flow control at the virtual connection level. Link flow control enables receiver cell buffer sharing while maintaining perconnection bandwidth with lossless cell transmission. High link level update frequency is enabled without a significant sacrifice in overall link forward bandwidth. A higher and thus more efficient utilization of receiver cell buffers is achieved.

5933429, Aug 3, 1999

Apr 29, 1997

8/827932

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

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

H04L 1256

370392

An apparatus and a method are disclosed for unencumbering valuable switching resources in a network switch involved in a multipoint-to-multipoint switching scenario. The network switch includes an input processing port that is connected to a plurality of input links, and an output processing port that is connected to a plurality of output links. A data cell received on an input link is processed by the input processing port by appending a link number, a port number, and a connection identification code associated with the input processing port to the data cell. The data cell is then transferred to the output processing port where it is processed by comparing the appended link number, port number, and connection identification code with those associated with the output processing port. The data cell is then stored in a data buffering queue in the output processing port according to a matching scheme.

5822540, Oct 13, 1998

Jul 18, 1996

8/683791

Stephen A. Caldara - Sudbury MA
Stephen A. Hauser - Burlington MA
Thomas A. Manning - Northboro MA
David N. Peck - Marlborough MA

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

G06F 1300

39520066

The invention comprises a method and apparatus for discarding frames in a communications device. In accordance with the method of the invention, a plurality of cells are received representing a plurality of frames wherein each cell comprises a data portion and a header portion including a cell loss priority indicator. At least some of the cells are stored in a buffer. It is determined if the number of cells in the buffer exceeds a first threshold when a first cell including an end of file marker is received. A series of cells received between the first cell and a second cell are discarded if the first threshold was exceeded in the determining step and if the cell loss priority indicator for a cell in the series of cells is set to a first state. The second cell comprises a cell including an end of file marker.

5787086, Jul 28, 1998

Jul 18, 1996

8/684641

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

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

H04L 1228, H04L 1256

370413

The invention comprises a method and apparatus for emulating a circuit connection in a cell based communications network. A virtual connection is sent from a source connected to the network to a node in the network wherein the virtual connection comprises a series of data cells comprising a header portion and a data portion. The virtual connection is transported across at least one communications link connecting the first node to a second node in the network. A first queue is dedicated to the virtual connection at each node in the network through which the signal passes. The queue comprises a first amount of buffer space, is dedicated for the duration of the circuit connection and, dedicated only to that virtual connection. A first amount of link bandwidth is allocated to the virtual connection on each communications link across which the virtual connection passes. The amount of link bandwidth is allocated for the duration of the circuit connection and is allocated only to that particular virtual connection.

6167452, Dec 26, 2000

Oct 14, 1999

9/417784

Thomas A. Manning - Northboro MA
Stephen A. Caldara - Sudbury MA
Stephen A. Hauser - Burlington MA
Alan D. Sherman - Acton MA

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

G06F 1516, G06F 1517

709232

A mechanism enabling plural queues in a downstream telecommunications network element to be treated as a single, joint queue for purposes of connection-level flow control. A pointer in at least one queue descriptor points to a queue descriptor in which is maintained a set of shared, joint counters. Other flow control elements are maintained individually with respect to each queue descriptor. This mechanism enables flow control elements associated with a single transmitter queue to flow control plural connections terminating in plural queues associated with a single receiver processor.

6115748, Sep 5, 2000

Jul 18, 1996

8/683448

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

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

G06F 1516

709234

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.