Michael B Libeskind

US Patent:

20040165584, Aug 26, 2004

Filed:

Feb 26, 2003

Appl. No.:

10/374612

Inventors:

Michael Libeskind - Yardley PA, US

International Classification:

H04L012/50

US Classification:

370/388000, 370/412000

Abstract:

A cross connect switch has a plurality of stages. Each stage has a plurality of packers, a plurality of memory portions and a plurality of multiplexers. Each packer receives input data and provides the input data as a set of contiguous valid data. The multiplexers divide the valid data from one of the packers into a plurality of data subsets and route each data subset to a respective memory portion of that stage. Each stage except the final stage provides the data in the memory portions of that stage as a respective set of inputs to a next one of the stages. The final stage includes a plurality of multiplexers for selecting a respective subset of the data from each of the memory portions of the final stage and provides the selected data at a plurality of respective selected output ports.

US Patent:

20090060498, Mar 5, 2009

Filed:

Sep 5, 2007

Appl. No.:

11/850454

Inventors:

Michael B. Libeskind - Yardley PA, US
Dat D. Ngo - Howell NJ, US

International Classification:

H04B 10/08
H04B 17/00

US Classification:

398 28

Abstract:

An apparatus and method for deriving fiber characteristics between two nodes in an optical communication network are disclosed. A roundtrip time for a signal to travel between two nodes is measured by sending the signal via the optical supervisory channel from a first node to a second node, which is configured for loopback operation. Fiber characteristics can be calculated based on the measured roundtrip time.