Gaylord Warner Richards

6538780, Mar 25, 2003

Nov 12, 1999

09/439016

Timothy Owen Murphy - Fairport NY
Gaylord Warner Richards - Lisle IL

Lucent Technologies Inc. - Murray Hill NJ

H04K 300

359111, 359117

An apparatus and method for reducing the number of control elements for crosstalk reduction devices in an optical switching network is disclosed. Crosstalk reduction devices are partitioned into two mutually exclusive groups based on a binary address of the crosstalk reduction device. By successively changing the bits within the destination address of the active signal path within the network, two mutually exclusive groups of crosstalk reduction devices is generated and one control signal is sufficient to operate the devices. The apparatus of the invention comprises a switching module having input channels and output channels, the switching network arranged in a tree topology comprising a first plurality of switching elements adapted to fan-out, said first plurality of switching elements coupled to said input channels; a plurality of crosstalk reduction devices coupled to said first plurality of switching elements, said crosstalk reduction device operable in a passing state and a blocking state; a second plurality of switching elements adapted to fan-in to said output channels, said second plurality of switching elements coupled to said crosstalk reduction devices; and a control signal coupled to each of said plurality of crosstalk reduction devices, said control signal adapted to selectively enable the passing state and the blocking state of said crosstalk reduction device.

6721502, Apr 13, 2004

Sep 30, 2000

09/675733

Daniel Y. Al-Salameh - Marlboro NJ
Donald L. Husa - Ocean NJ
David S. Levy - Freehold Township, Monmouth County NJ
Timothy O. Murphy - Perinton NY
Gaylord W. Richards - Lisle IL

Lucent Technologies Inc. - Murray Hill NJ

G02F 100

398 3, 398 2, 398 5, 398 12

An optical transmission system formed from a plurality of nodes interconnected in a ring configuration via at least two transmission media provides protection capacity for each optical channel. If a channel signal does not meet predetermined criteria, then a loss of signal indication is declared for the channel and one of a plurality of protection switching states is invoked to re-route service traffic carried by the impaired channel to its destination via corresponding protection capacity. The switching states include particular transmission states and at least âkeep-aliveâ and âprotection accessâ states.

7283745, Oct 16, 2007

Mar 31, 2003

10/403579

Krishnan Kumaran - Scotch Plains NJ, US
Timothy O. Murphy - Fairport NY, US
Nachi K. Nithi - Wayne NJ, US
Carl Jeremy Nuzman - Summit NJ, US
Gaylord W. Richards - Lisle IL, US

Lucent Technologies Inc. - Murray Hill NJ

H04J 14/00

398 45

Techniques and systems for design of optical switch arrays so as to minimize power requirements are described. A design system includes a computer system hosting a design program. The design program receives parameters for the switch array, including a number N of outputs required, and either a maximum number L of stages allowed or maximum and average power requirements allowed. If power requirements are used as parameters, the design program uses N and the power requirements to compute the value of L. The design program then constructs a minimum power sequence of L switches or N switches, whichever is less. If N is less than L+1, N outputs are present and the array is complete. If N is greater than L+1, the design program then adds switches one at a time to the minimum power switch path of the array, until the array provides N outputs.

49222457, May 1, 1990

Jul 19, 1989

7/382510

Frank K. Hwang - Warren NJ
Gaylord W. Richards - Naperville IL

AT&T Bell Laboratories - Murray Hill NJ

H04Q 100
H04Q 300

34082508

A switching network where a large class of combinatorial designs which are well known in the mathematical literature are for the first time applied to advantageously define the pattern of permanent connections effected between network input channels and initial network crosspoints, illustratively by a connection arrangement of a two-stage, rearrangeable network. The class of combinatorial designs comprises designs of three types: (1) block designs, (2) orthogonal arrays, and (3) difference sets. Each of these is used in a unique manner to derive an advantageous pattern of permanent connections.

56871724, Nov 11, 1997

Dec 30, 1994

8/366707

Thomas Jay Cloonan - Downers Grove IL
Gaylord Warner Richards - Lisle IL

Lucent Technologies Inc. - Murray HIll NJ

H04L 1256

370395

A distribution network that has very low internal blocking, similar to that found in large N. times. N single crossbar networks, but without the complexity and cost of such a network. Further, this distribution network has only one stage to simplify and speed up the ability to find a path through the network to fulfill each request. The distribution network is a fabric of small crossbar switches which are organized into a plurality of pipes. Each of the pipes provides a path that could fulfill any request assuming that path is not currently busy. Sophisticated statistics are used to reduce the possibility of internal block to a very low level. The single stage of pipes simplifies the hunt for a path through the distribution network to a hunt for a pipe having the required path that is empty or idle. Because of the single stage and the simplified path hunting, a fabric of switches may be built that has a throughput of over one terabit per second.

57243492, Mar 3, 1998

Aug 31, 1995

8/521676

Thomas Jay Cloonan - Downers Grove IL
Gaylord Warner Richards - Lisle IL

Lucent Technologies Inc. - Murray Hill NJ

H04L 1256

370390

An out-of-band controller for a large packet switch which is distributed throughout partitions or pipes of the packet switch. Thus, the out-of-band controller is divided into multiple pipe controllers. These pipe controllers are connected and operated in a ring such that each pipe controller is with a respective fraction of the input path requests for packets. The requests are processed concurrently and any request that is not fulfilled in one pipe controller is offered to up to three subsequent pipe controllers to hunt a path for the awaiting packets. The controller, by using up to four levels of parallelism, can hunt paths and set up connections for 256 or more input ATM packet lines in normal monocast mode, thus providing a throughput of 1 terabit per second or more. A distributed controller design makes such tremendous aggregate switching speeds possible. The same general distributed controller design can also provide pipe hunting for a special packet operation called multicasting, in which one packet from one input line is transmitted to many or even all output lines.

52589781, Nov 2, 1993

Jan 22, 1992

7/803501

Thomas J. Cloonan - Downers Grove IL
Anthony L. Lentine - St. Charles IL
Frederick B. McCormick - Lisle IL
Gaylord W. Richards - Naperville IL

AT&T Bell Laboratories - Murray Hill NJ

H04L 1256

370 60

A multi-stage network which achieves the same overall connectivity as known networks but where individual switching nodes have no input selectivity and no output selectivity. Each node is enabled or disabled to control communication therethrough in response to a single control signal. The functionality of a switching network is achieved by controlling which nodes are enabled rather than specifying connections of particular node inputs and outputs to be effected by the nodes. In a photonic network embodiment, each network node is implemented using a single symmetric self electro-optic effect device (S-SEED).

51228920, Jun 16, 1992

May 8, 1989

7/349280

Thomas J. Cloonan - Downers Grove IL
Anthony L. Lentine - St. Charles IL
Frederick B. McCormick - Lisle IL
Gaylord W. Richards - Naperville IL

AT&T Bell Laboratories - Murray Hill NJ

H04J 1400

359117

A multi-stage network which achieves the same overall connectivity as known networks but where individual switching nodes have no input selectivity and no output selectivity. Each node is enabled or disabled to control communication therethrough in response to a single control signal. The functionality of a switching network is achieved by controlling which nodes are enabled rather than specifying connections of particular node inputs and outputs to be effected by the nodes. In a photonic network embodiment, each network node is implemented using a single symmetric self electro-optic effect device (S-SEED).