Rohit S Sharma, 52949 Cooper Ct, Buffalo Grove, IL 60089

6839514, Jan 4, 2005

Nov 15, 2000

09/714378

Rohit Sharma - Sunnyvale CA, US
Larry R. McAdams - Belmont CA, US

CIENA Corporation - Linthicum MD

G02F 100
H01S 300
H04B 1000

398 2, 398 3, 398 5, 398 45

Techniques for providing normal operation and service restoration capability in the event of failure of terminal equipment or transmission media in a heterogeneous network, such as a hybrid network containing single- and multi-wavelength lightwave communications systems. An optical switching node (OSN) is placed at each node in the ring network to provide the required connections between various fibers and terminal equipment, but having switch states that allow signals on the protection fibers to bypass the terminal equipment at that node. Ring-switched signals propagate around the ring on protection fibers without encountering the terminal equipment at the intervening nodes. To the extent that the protection fiber links between any given pair of nodes are incapable of supporting all the relevant communication regimes, such links are modified to provide such support.

6885822, Apr 26, 2005

Jun 5, 2001

09/875243

Hon Wah Chin - Palo Alto CA, US
Rohit Sharma - Sunnyvale CA, US
Holden Jessup - Palo Alto CA, US
Denis Zaccarin - Sunnyvale CA, US

Ciena Corporation - Linthicum MD

G02F001/00
H04B010/20

398 59, 398 3, 398 4, 398 5

In a ring having first and second adjacent nodes, and two fibers carrying information between the first and second nodes, the first fiber carries information in one direction, while the second fiber carries information in another direction. Each fiber includes wavelength capacity allocated to working and protection traffic. The working and protection wavelength capacities in the first fiber are respectively assigned to first and second disjoint sets of wavelengths, while the working and protection wavelength capacities in the second fiber are respectively assigned to the second and first disjoint sets of wavelengths.

6918070, Jul 12, 2005

May 26, 2000

09/580029

Rohit Sharma - Sunnyvale CA, US

Ciena Corporation - Linthicum MD

G06F011/00

714708, 714707

A network element (NE) in a communications network decodes a data stream received over a communication link. Upon synchronization with the data stream, the NE determines a performance metric for the link based on a number of transmission code violations. In response to the performance metric exceeding a predetermined threshold, the NE commands the selection of a different link to carry the data stream via a switch signal. The switching or rerouting of signals may occur between a single pair of NEs (e. g. , point-to-point span) or in a more complex topology having a plurality of interconnected NEs.

7046619, May 16, 2006

Nov 6, 2001

10/045955

Sridhar Alagar - Sunnyvale CA, US
Brian Pheiffer - Santa Jose CA, US
Rohit Sharma - Sunnyvale CA, US
Stephane St. Laurent - Santa Clara CA, US
Holden D. Jessup - Palo Alto CA, US
Rainer Iraschko - Sunnyvale CA, US

CIENA Corporation - Linthicum MD

H04L 1/00

370216, 370252, 370352, 370389, 714 4

A system for use in a bi-directional path switched ring network for detecting a failed optical path and establishing a protection path so as to allow signals from the failed optical path to be re-routed via the protection path is provided. According to one aspect of the system, upon detecting a failure relating to an optical path, the destination node generates a connection request message for transmission to the source node. The connection request message is passed to the source node via one or more intermediate nodes, if any. Each intermediate node examines the connection request message accordingly reserves the requisite wavelength from the protection capacity so as to allow signals from the failed optical path to be re-routed. Upon receiving the connection request message, the source node readies its switching equipment to re-route signals from the failed optical path and generates an acknowledgment message and propagates it back to the destination node via the intermediate nodes. The intermediate nodes and the destination node, upon receipt of the acknowledgement message, also ready their respective switching equipment to carry the re-routed signals via the previously reserved wavelength from the protection capacity.

7167646, Jan 23, 2007

Apr 19, 2005

11/108771

Hon Wah Chin - Palo Alto CA, US
Rohit Sharma - Sunnyvale CA, US
Holden Jessup - Palo Alto CA, US
Denis Zaccarin - Sunnyvale CA, US

Ciena Corporation - Linthicum MD

G02F 1/00
H04B 10/20

398 5, 398 3, 398 4, 398 59, 370223

In a ring having first and second adjacent nodes, and two fibers carrying information between the first and second nodes, the first fiber carries information in one direction, while the second fiber carries information in another direction. Each fiber includes wavelength capacity allocated to working and protection traffic. The working and protection wavelength capacities in the first fiber are respectively assigned to first and second disjoint sets of wavelengths, while the working and protection wavelength capacities in the second fiber are respectively assigned to the second and first disjoint sets of wavelengths.

7184402, Feb 27, 2007

Aug 30, 2001

09/944782

Rohit Sharma - Milpitas CA, US
Chang Ahn - San Jose CA, US
Swaminathan Sundararaman - San Jose CA, US

Cisco Technology, Inc - San Jose CA

H04L 12/46

370232, 370462

A distribution pattern is established to distribute multilink frame relay (MFR) fragments. The distribution pattern includes a sequence of link entries associated with links in a link bundle. A number of link entries in the distribution pattern is determined by dividing a total link speed of the link bundle by a minimum possible link speed supported by a system. Each link entry is placed in the distribution pattern when the associated link is capable of transmitting a current fragment in a fastest transmit time. The fastest transmit time is determined based on the link speed of the link and a transmit time for the link to transmit other fragments previously allocated to that link. The fragments are distributed to the links in the link bundle according to the distribution pattern from a first link entry to a last link entry in the distribution pattern. The distribution pattern is repeated after the last link entry.

7187683, Mar 6, 2007

Dec 7, 2001

10/013386

John Sandoval - Santa Clara CA, US
Virendra Patel - Fremont CA, US
Frederic Mathieu - San Francisco CA, US
Jayakumar Jayakumar - San Jose CA, US
Rohit Sharma - Milpitas CA, US

Cisco Technology, Inc. - San Jose CA

H04L 12/28

370410

A statistics data collection mechanism for distributed, high-speed data processing environments is described. According to one embodiment, an update message containing statistics data related to a data packet carried along a virtual connection is assembled and the update message is then transmitted to a statistics collection engine for further processing. According to another embodiment, the update message is received from one or more processing devices, and multiple counters are then updated to store the statistics data.

7206508, Apr 17, 2007

Aug 31, 2004

10/929549

Rohit Sharma - Sunnyvale CA, US
Larry R. McAdams - Belmont CA, US

CIENA Corporation - Linthicum MD

H04J 14/02

398 4, 398 30, 398 51, 398 59, 398 83

Techniques for providing normal operation and service restoration capability in the event of failure of terminal equipment or transmission media in a heterogeneous network, such as a hybrid network containing single- and multi-wavelength lightwave communications systems. An optical switching node (OSN) is placed at each node in the ring network to provide the required connections between various fibers and terminal equipment, but having switch states that allow signals on the protection fibers to bypass the terminal equipment at that node. Ring-switched signals propagate around the ring on protection fibers without encountering the terminal equipment at the intervening nodes. To the extent that the protection fiber links between any given pair of nodes are incapable of supporting all the relevant communication regimes, such links are modified to provide such support.