Pre-equalization technique for upstream communication between cable modem and headend

US7120123B1 · kind B1 · utility

Assignee

• Broadcom Corporation · US

Inventors

• Thomas J. Quigley · Wake Forest, US
• Jonathan S. Min · Buena Park, US
• Lisa V. Denney · Suwanee, US
• Henry Samueli · San Juan Capistrano, US
• Sean F. Nazareth · Irvine, US
• Feng Chen · Feucht, DE
• Fang Lu · Walnut, US
• Christopher R. Jones · Santa Monica, US

Key dates

• Filing date: Nov 9, 2000
• Grant date: Oct 10, 2006
• Expiry date: May 19, 2023

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04L2025/03808
• WIPO field: Digital communication
• WIPO sector: Electrical engineering

Abstract

A number of features for enhancing the performance of a cable transmission system in which data is transmitted between a cable modem termination system at a headend and a plurality of cable modems located different distances from the headend. The power transmission level, slot timing, and equalization of the cable modems are set by a ranging process. Data is transmitted by the modems in fragmented form. Various measures are taken to make transmission from the cable modems robust. The upstream data transmission is controlled to permit multiple access from the cable modems.