Synchronizing separated edge QAM devices located remotely from a CMTS

US7873077B2 · kind B2 · utility

Assignee

• ARRIS Group, Inc. · US

Inventors

• Denis Downey · Pleasanton, US
• Alex Volkov · Eden Prairie, US
• Michael B. Harrington · Cork, IE
• Frank O'Keeffe · Cork, IE
• Yury Kharkunou · Cork, IE

Key dates

• Filing date: Jun 18, 2008
• Grant date: Jan 18, 2011
• Expiry date: Oct 1, 2028

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04J3/0682
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

The clocks of one or more edgeQAM devices are synchronized with a master clock at the remotely located CMTS. A master clock signal may be transmitted via a dedicated gigabit Ethernet link. Alternatively, master clock information contained in a time synchronization message may be transmitted for use in adjusting local oscillators that drive local clocks at respective edgeQAM devices.