Christopher O O'Brien

US Patent:

7571470, Aug 4, 2009

Filed:

Mar 24, 2005

Appl. No.:

11/089754

Inventors:

Mauricio Arregoces - Rancho Palos Verdes CA, US
Maurizio Portolani - Milpitas CA, US
Christopher M. O'Brien - Fuquay Varina NC, US
Stefano Testa - San Jose CA, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

G06F 21/00

US Classification:

726 11, 726 15, 713153, 709238, 709239

Abstract:

A one-arm data center topology routes traffic between internal sub-nets and between a sub-net and an outside network through a common chain of services. The data center topology employs layer services on a common chassis or platform to provide routing and firewall services while reducing the number of devices necessary to implement the data center and simplifying configuration. Load balancing is provided by a load balancing device. In the one-arm topology, policy based routing or client network address translations or NAT pushes traffic to the CSM.

US Patent:

8416813, Apr 9, 2013

Filed:

Apr 29, 2009

Appl. No.:

12/432023

Inventors:

Nirav J. Modi - Elmhurst IL, US
Robert E. Bland - Schaumburg IL, US
Christopher V. O'Brien - North Aurora IL, US

Assignee:

Tellabs Operations, Inc. - Naperville IL

International Classification:

H04J 3/06

US Classification:

370516

Abstract:

An apparatus and method for managing clock domain(s) crossing several communication networks are disclosed. In one embodiment, a process capable of managing clock domains receives a data stream over a circuit emulation service (“CES”). Upon storing the data stream in a traffic buffer, the process selects a first clock domain for processing the data stream in the traffic buffer. For example, the process is capable of using the first clock domain to process and/or empty a jitter buffer, which stores CES data packets. The traffic buffer is monitored and the first clock domain can be replaced with a second clock domain if the storage capacity of the traffic buffer indicates that a different clock domain is needed.

US Patent:

8503458, Aug 6, 2013

Filed:

Apr 29, 2009

Appl. No.:

12/432056

Inventors:

Nirav J. Modi - Elmhurst IL, US
Robert E. Bland - Schaumburg IL, US
Christopher V. O'Brien - North Aurora IL, US

Assignee:

Tellabs Operations, Inc. - Naperville IL

International Classification:

H04L 12/28

US Classification:

37039553

Abstract:

An apparatus and method for managing and characterizing clock domains in multi-domain networks are disclosed. A process of clock domain management is capable of receiving a data packet or data stream traveling across CES circuit. Upon obtaining a clock domain hierarchy stored in a storage location, the process identifies a clock frequency in the clock domain hierarchy in accordance with the CES circuit. The clock domain hierarchy, in one embodiment, is a searchable database containing information relating to clock domains. The clock frequency is subsequently assigned to a packet processing unit for data processing.

US Patent:

20090097848, Apr 16, 2009

Filed:

Oct 12, 2007

Appl. No.:

11/871972

Inventors:

Anthony L. Sasak - Arlington Heights IL, US
Christopher V. O'Brien - North Aurora IL, US

International Classification:

H04J 14/00

US Classification:

398 52

Abstract:

A method includes storing a value of shared variables from an active member of a plurality of packet-to-tdm interfaces. Another member of the plurality of packet-to-tdm interfaces is selected to become active. The value of shared variables is provided to the selected member.

US Patent:

20160142329, May 19, 2016

Filed:

Jan 26, 2016

Appl. No.:

15/006955

Inventors:

Anthony Leonard Sasak - Arlington Heights IL, US
Christopher V. O'Brien - North Aurora IL, US

Assignee:

Tellabs Operations Inc. - Naperville IL

International Classification:

H04L 12/841
H04L 12/863

Abstract:

A network device such as a router or switch, in one embodiment, includes a timing analyzer which is capable of providing timing analysis over one or more network circuits. The timing analyzer, in one aspect, receives a data packet traveling across a circuit emulation service (“CES”) circuit such as T1 or E1 circuit. Upon obtaining an arrival timestamp associated with the data packet, the arrival timestamp is stored in a timestamp buffer in accordance with a first-in first-out (“FIFO”) storage sequence. After identifying the oldest arrival timestamp in the timestamp buffer, an offset is generated based on the result of comparison between the arrival timestamp and the oldest timestamp. The timing analyzer can also be configured to generate timing reports on-demand based on generated offset(s).

US Patent:

20140359034, Dec 4, 2014

Filed:

May 28, 2014

Appl. No.:

14/288524

Inventors:

David A. Hernandez - Chicago IL, US
Mark Skroch - Chicago IL, US
Christopher O'Brien - Evanston IL, US
Joseph Rosenthal - Glencoe IL, US
Michael Blocher - Chicago IL, US

International Classification:

H04L 12/58
G06F 17/30

US Classification:

709206

Abstract:

This patent discloses inventive methods and systems for automatically monitoring an electronic information stream for the occurrence of preconfigured trigger condition, such as the presence of keywords, images, and other identifiable stream content. Upon recognition of the preconfigured trigger condition, the inventive methods and systems automatically make a donation, send a counter-statement, or take some other preconfigured advocacy action related to the stream and trigger condition.