William Z Lu

US Patent:

7443789, Oct 28, 2008

Filed:

Nov 21, 2001

Appl. No.:

09/990023

Inventors:

Donald J. Glaser - Huntington Beach CA, US
Anthony Barrera - Chino Hills CA, US
William W. Lu - Irvine CA, US
Dennis P. Miller - Fullerton CA, US

Assignee:

ADC DSL Systems, Inc. - Eden Prairie MN

International Classification:

G01R 31/08
G06F 11/00
G08C 15/00
H04J 1/16
H04J 3/14
H04L 1/00
H04L 12/28
H04B 1/38

US Classification:

370228, 370216, 455561

Abstract:

A system and method for protection switching in a transmission network is described. A protection switching mechanism comprises a multiplexer, a transmission path for each output of the multiplexer and a remote circuit. The multiplexer has an input coupled to receive an input signal and a plurality of outputs to output a plurality of output signals. Each transmission path is coupled to receive an associated output signal from the multiplexer. The transmission paths further include one or more redundant transmission paths, wherein signals directed to a faulty transmission path are redirected to an associated redundant transmission path. The remote circuit is used to selectively switch a redundant transmission path for a faulty transmission path at a subscriber.

US Patent:

20050036560, Feb 17, 2005

Filed:

Aug 14, 2003

Appl. No.:

10/640747

Inventors:

William Lu - Irvine CA, US
Mo-Ching Lau - Orange CA, US

International Classification:

H04L025/00

US Classification:

375257000

Abstract:

A method for modeling cable loss for a cable plant is provided. The method includes identifying a service to be provided over the cable plant, selectively entering a value corresponding to at least one parameter of the cable plant, and on entering values, determining and displaying the estimated cable loss for the cable plant providing the service based on the entered values and an empirical model of cable loss, the empirical model including data on losses affected by bridge tap placement and bridge tap length in the cable plant.