Ornan Alexander Gerstel

US Patent:

6366713, Apr 2, 2002

Filed:

Sep 4, 1998

Appl. No.:

09/143335

Inventors:

Philip J. Lin - Newton MA
Ornan A. Gerstel - Cupertino CA

Assignee:

Tellabs Operations, Inc. - Lisle IL

International Classification:

G02B 635

US Classification:

385 16

Abstract:

A switch core is set forth that comprises a plurality of duplex switches that are interconnected with a interconnection fabric to implement, for example, strictly non-blocking operation of the switch core for reciprocal traffic. In one embodiment, an N-way reciprocal switch is implemented. The N-way reciprocal switch comprises a plurality of duplex switches numbering N of at least a 1Ã(N-1) switch type (e. g. , the duplex switches have at least N-1 ports available for connection to implement the interconnection fabric). The interconnection fabric interconnects the plurality of duplex switches so that each duplex switch is connected to every other duplex switch used in the interconnection fabric by a single connection. A similar architecture using switches numbering N of at least a 1ÃN switch type are also set forth. Still further, a plurality of duplex switches are used to implement an (n,m)-way switch that, in turn, can be used to construct a recursive LM-way switch core and/or recursively expand an existing Clos switch core.

US Patent:

6591028, Jul 8, 2003

Filed:

Nov 2, 2001

Appl. No.:

10/003127

Inventors:

Philip J. Lin - Newton MA
Ornan A. Gerstel - Cupertino CA

Assignee:

Tellabs Operations, Inc. - Lisle IL

International Classification:

G02B 635

US Classification:

385 16

Abstract:

A switch core is set forth that comprises a plurality of duplex switches that are interconnected with a interconnection fabric to implement, for example, strictly non-blocking operation of the switch core for reciprocal traffic. In one embodiment, an N-way reciprocal switch is implemented. The N-way reciprocal switch comprises a plurality of duplex switches numbering N of at least a 1Ã(N-1) switch type (e. g. , the duplex switches have at least N-1 ports available for connection to implement the interconnection fabric). The interconnection fabric interconnects the plurality of duplex switches so that each duplex switch is connected to every other duplex switch used in the interconnection fabric by a single connection. A similar architecture using switches numbering N of at least a 1ÃN switch type are also set forth. Still further, a plurality of duplex switches are used to implement an (n, m)-way switch that, in turn, can be used to construct a recursive LM-way switch core and/or recursively expand an existing Clos switch core.

US Patent:

6721508, Apr 13, 2004

Filed:

Apr 19, 1999

Appl. No.:

09/293775

Inventors:

Ornan A. Gerstel - New York NY
Rajiv R. Ramaswami - Yorktown Heights NY

Assignee:

Tellabs Operations Inc.

International Classification:

H04J 1402

US Classification:

398 83, 398 43, 398 45, 398 48, 398 79, 398 82

Abstract:

A wavelength division multiplexed optical communication system includes a plurality of optical line terminals which may be part of separate in service networks, each having a line interface and an all-optical pass-through interface including a plurality of pass-through optical ports, and each also including a plurality of local optical ports which are connectable to client equipment and an optical multiplexer/demultiplexer for multiplexing/demultiplexing optical wavelengths. The optical multiplexer/demultiplexer may include one or more stages for inputting/outputting individual wavelengths or bands of a predetermined number of wavelengths, or a combination of bands and individual wavelengths. At least one of the pass-through optical ports of an optical line terminal of one network may be connected to at least one of the pass-through optical ports of an optical line terminal of another network to form an optical path from the line interface of the optical line terminal of the one network to the line interface of the optical line terminal of the another network to form a merged network. The use of such optical line terminals allows the upgrading and merging of the separate networks while in service.

US Patent:

6785438, Aug 31, 2004

Filed:

Jan 29, 2003

Appl. No.:

10/353425

Inventors:

Philip J. Lin - Newton MA
Ornan A. Gerstel - Cupertino CA

Assignee:

Tellabs Operations, Inc. - Naperville IL

International Classification:

G02B 635

US Classification:

385 16, 385 17

Abstract:

A switch core is set forth that comprises a plurality of duplex switches that are interconnected with a interconnection fabric to implement, for example, strictly non-blocking operation of the switch core for reciprocal traffic. In one embodiment, an N-way reciprocal switch is implemented. The N-way reciprocal switch comprises a plurality of duplex switches numbering N of at least a 1Ã(N-1) switch type (e. g. , the duplex switches have at least N-1 ports available for connection to implement the interconnection fabric). The interconnection fabric interconnects the plurality of duplex switches so that each duplex switch is connected to every other duplex switch used in the interconnection fabric by a single connection. A similar architecture using switches numbering N of at least a 1ÃN switch type are also set forth.

US Patent:

6853763, Feb 8, 2005

Filed:

Sep 27, 2002

Appl. No.:

10/259240

Inventors:

John McNicol - Ottawa, CA
Babu O. Narayanan - San Jose CA, US
Ornan A. Gerstel - Los Altos CA, US

Assignee:

Nortel Networks Limited - Quebec

International Classification:

G02B006/26
G02B006/42

US Classification:

385 17, 398 50, 398 83

Abstract:

A photonic switching apparatus includes primary photonic switching logic to perform photonic pass-through and add/drop functions and secondary photonic switching logic to reduce the effective number of add/drop interfaces and/or switch optical signal channels to and from clients or client adaptation devices.

US Patent:

6898376, May 24, 2005

Filed:

Dec 14, 1999

Appl. No.:

09/459947

Inventors:

Ornan A. Gerstel - Los Altos CA, US
Rajiv R. Ramaswami - Sunnyvale CA, US

Assignee:

Tellabs Operations, Inc. - Lisle IL

International Classification:

H01S003/00
H04B010/00
H04J014/00

US Classification:

398 5, 398 2

Abstract:

An optical communication system comprising plural optical communication paths, a passive optical coupler, and at least one optical node. The passive optical coupler has a plurality of inputs coupled through the passive optical coupler to an output of the passive optical coupler, and each input is coupled in a corresponding one of the optical communication paths. Each optical node comprises plural optical line terminals, each of which is interposed in a corresponding at least one of the optical communication paths. Each optical line terminal is operable to either (a) substantially prevent an optical signal propagating in that corresponding at least one optical communication path from reaching a corresponding input of the passive optical coupler through the at least one optical communication path, or (b) permit the optical signal to propagate in that corresponding at least one optical communication path towards the corresponding input of the passive optical coupler.

US Patent:

6985653, Jan 10, 2006

Filed:

Jul 23, 2004

Appl. No.:

10/897642

Inventors:

Philip J. Lin - Newton MA, US
Ornan A. Gerstel - Cupertino CA, US

Assignee:

Tellabs Operations, Inc. - Naperville IL

International Classification:

G02B 6/35

US Classification:

385 17, 385 16

Abstract:

A switch core is set forth that comprises a plurality of duplex switches that are interconnected with a interconnection fabric to implement, for example, strictly non-blocking operation of the switch core for reciprocal traffic. In one embodiment, an N-way reciprocal switch is implemented. The N-way reciprocal switch comprises a plurality of duplex switches numbering N of at least a 1×(N−1) switch type (e. g. , the duplex switches have at least N−1 ports available for connection to implement the interconnection fabric). The interconnection fabric interconnects the plurality of duplex switches so that each duplex switch is connected to every other duplex switch used in the interconnection fabric by a single connection. A similar architecture using switches numbering N of at least a 1×N switch type are also set forth. Still further, a plurality of duplex switches are used to implement an (n,m)-way switch that, in turn can be used to construct a recursive LM-way switch core and/or recursively expand an existing Clos switch core.

US Patent:

7054262, May 30, 2006

Filed:

Mar 26, 2004

Appl. No.:

10/809987

Inventors:

Ornan Gerstel - Los Altos CA, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

H04L 12/16

US Classification:

370216, 370221, 370242, 370408

Abstract:

Systems and methods provide very fast protection switching while leaving selected traffic unprotected. When a link fails, only certain pre-selected paths are rerouted at the point of failure. Other traffic is left unprotected or protected at another layer. Signaling of the failure and the rerouting is performed for the link as a whole rather than for the individual paths. Signaling occurs at a first layer of a digital transmission hierarchy while path rerouting switching occurs at a second hierarchical layer above the first layer. In certain implementations, K1/K2 bytes are used in signaling at the optical line layer (OC-n), while only protected High-Order paths (STS) and Low-Order paths (VT) are protected by the protection switch.