Architecture for minimum loop current during ringing and caller ID

US6104794A · kind A · utility

Assignee

• Silicon Laboratories Inc. · US

Inventors

• Jerrell P. Hein · Driftwood, US
• Andrew W. Krone · Austin, US
• Jeffrey W. Scott · Austin, US
• Navdeep S. Sooch · Emmaus, US
• David R. Welland · Austin, US

Key dates

• Filing date: Mar 4, 1998
• Grant date: Aug 15, 2000
• Expiry date: Mar 4, 2018

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04L7/033
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

A communication system is provided which draws virtually no loop current during a ringing burst and only draws on-hook loop current during the caller ID field. More particularly, ringer burst circuitry may be powered from the user powered circuitry by the transmission of power across the isolation barrier rather than being powered from the phone line. Thus, loop current need not be drawn from the TIP/RING lines during ringer bursts. The isolation barrier may be a capacitive isolation barrier which allows bidirectional communication and extraction of power from signals transmitted across the barrier.