Architecture for minimum loop current during ringing and caller ID
First Claim
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1. A communication system, comprising:
- phone line side circuitry for coupling to phone lines;
powered side circuitry for coupling to the phone line side circuitry through an isolation barrier; and
phone line side integrated ringer circuitry within the phone line side circuitry, the phone line side integrated ringer circuitry drawing substantially no loop current from the phone line during ringing conditions.
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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.
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Citations
20 Claims
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1. A communication system, comprising:
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phone line side circuitry for coupling to phone lines; powered side circuitry for coupling to the phone line side circuitry through an isolation barrier; and phone line side integrated ringer circuitry within the phone line side circuitry, the phone line side integrated ringer circuitry drawing substantially no loop current from the phone line during ringing conditions. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of providing a communication system for coupling to a phone line, comprising:
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coupling an isolation barrier between powered side circuitry and phone line side circuitry; partitioning ringer detection circuitry into a first integrated ringer circuit within the powered side circuitry and a second integrated ringer circuit within the phone line side circuitry; and powering the second integrated ringer circuit portion by extracting power from a signal transmitted across the isolation barrier. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A method of operating ringer detection circuitry to detect ringing conditions on a phone line, comprising:
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coupling the ringer detection circuitry to an input, the input provided for coupling to a phone line; and drawing substantially no loop current from the phone line to operate the ringer detection circuitry during ringing conditions. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification