System for providing extended range ADSL service with auxiliary pots channel over single-line digital subscriber link

US7031346B2 · kind B2 · utility

Assignee

• Adtran, Inc. · US

Inventors

• Kevin W. Schneider · Huntsville, US
• Thomas L. Ballard, III · Madison, US
• John B. Wilkes · Richmond, US
• Philip David Williams · Madison, US
• Gary M. Willoughby · Harvest, US
• Mark Jeffries Ogden · Owens Cross Roads, US
• Michael Scott Sansom
• W. Stuart Venters · Huntsville, US

Key dates

• Filing date: Jul 20, 2001
• Grant date: Apr 18, 2006
• Expiry date: Feb 4, 2024

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04L12/66
• WIPO field: Digital communication
• WIPO sector: Electrical engineering

Abstract

Relatively low cost asymmetric digital subscriber line (ADSL) service and auxiliary POTS service are delivered over extended distances (e.g., at least 20–25 kft), by a hybrid ADSL-SDSL architecture insertable between central office and remote sites of an ADSL system. Central office and remote site transceivers employ trellis coded pulse amplitude modulation and a data rate that conforms with the signal transport capability of an extended distance symmetric DSL (SDSL) loop, while providing a 64K POTS channel. The central office and remote site transceivers controllably insert idle asynchronous transfer mode (ATM) cells in upstream and downstream ADSL channels to compensate for timing differences with ADSL equipment.