Direct digital access arrangement circuitry and method for connecting DSL circuitry to phone lines
First Claim
1. Circuitry for terminating a phone line connection, comprising:
- powered side circuitry operable to communicate digitally with phone line side circuitry, said digital communication comprising a digital data stream;
phone line side circuitry operable to communicate digitally with powered side circuitry, said digital communication between said powered side circuitry and said phone line side circuitry comprising a digital data stream transmitted through an isolation barrier; and
encode and decode circuitry coupled to said digital data stream to generate an encoded digital signal for transmission and receipt across said isolation barrier.
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Abstract
An isolation system is provided that is suitable for use in telephony, medical instrumentation, industrial process control and other applications. Preferred embodiments of the invention comprise a capacitive isolation barrier across which a digital signal is communicated. The system provides a means of communication across the isolation barrier that is highly immune to amplitude and phase noise interference. Clock recovery circuitry may be employed on one side of the isolation barrier to extract timing information from the digital signal communicated across the barrier, and to filter the effects of phase noise introduced at the barrier. Delta-sigma converters may be disposed on both sides of the isolation barrier to convert signals between analog and digital domains. An isolated power supply may also be provided on the isolated side of the barrier, whereby direct current is generated in response to the digital data received across the isolation barrier. A bidirectional isolation system is provided whereby bidirectional communication of digital signals is accomplished using a single pair of isolation capacitors. In preferred embodiments, the digital data communicated across the barrier consists of digital delta-sigma data signals multiplexed in time with other digital control, signaling and framing information. Finally, the isolation system may include a pulse transformer to accommodate ADSL circuitry, whereby power is transmitted through the pulse transformer.
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Citations
35 Claims
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1. Circuitry for terminating a phone line connection, comprising:
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powered side circuitry operable to communicate digitally with phone line side circuitry, said digital communication comprising a digital data stream;
phone line side circuitry operable to communicate digitally with powered side circuitry, said digital communication between said powered side circuitry and said phone line side circuitry comprising a digital data stream transmitted through an isolation barrier; and
encode and decode circuitry coupled to said digital data stream to generate an encoded digital signal for transmission and receipt across said isolation barrier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of operating circuitry for terminating a phone line connection, comprising:
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providing phone line side circuitry operable to communicate with a capacitive isolation barrier and the phone line connection;
utilizing digital information transmitted across the capacitive isolation barrier to provide a phone line side clock; and
utilizing digital information transmitted across the capacitive isolation barrier to provide a power supply for at least a portion of the phone line side circuitry. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. Circuitry for terminating a phone line connection, comprising:
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powered side circuitry operable to communicate digitally with phone line side circuitry, said digital communication comprising a digital data stream transmitted across a isolation barrier through a first bi-directional connection;
the isolation barrier including at least one capacitor andphone line side circuitry operable to communicate digitally with powered side circuitry, said digital communication comprising a digital data stream transmitted across said isolation barrier through a second bidirectional connection. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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26. A method for communicating with phone lines, comprising:
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converting a digital signal into a digital data stream;
communicating said digital data stream across an isolation barrier from a bi-directional connection on powered side circuitry to a bi-directional connection on phone line side circuitry, said communication being bidirectional through at least one capacitive element; and
utilizing the digital data stream to generate a power supply within the phone line side circuitry. - View Dependent Claims (27, 28, 29, 30)
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31. Circuitry for terminating a phone line connection, comprising:
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powered side circuitry operable to communicate digitally with phone line side circuitry through a first node capable of communicating with a capacitive isolation barrier;
phone line side circuitry operable to communicate digitally with the powered side circuitry through a second node capable of communicating with the capacitive isolation barrier;
a clock signal within the phone line side circuitry, the clock signal capable of being generated from information transmitted across the capacitive isolation barrier;
at least one power supply within the phone line side circuitry, the power supply capable of being generated from information transmitted across the capacitive isolation barrier; and
at least one control signal within the phone line side circuitry, the control signal being capable of being transmitted across the capacitive isolation barrier. - View Dependent Claims (32, 33, 34, 35)
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Specification