Method and apparatus for implementing carrierless amplitude/phase encoding in a network
First Claim
1. A transceiver for receiving out-of-band control signals on a receive control channel over a first twisted pair of conductors, and for receiving in-band data on a data channel over a second twisted pair of conductors, including:
- a. a first receiver, adapted to be coupled to the first twisted pair of conductors, for receiving said out-of-band control signals on a receive control channel, each out-of-band control signal being indicative of the state of the data channel;
b. a second receiver, adapted to be coupled to the second twisted pair of conductors, for receiving an in-band data signal on the data channel, the second receiver having a detector for canceling control signals transmitted from the transceiver over the second twisted pair of conductors and detecting data signals during transmission of such canceled control signals from the transceiver;
c. a processor, coupled to the first receiver and to the second receiver for determining the status of the data channel based upon the control signal received over the receive control channel.
4 Assignments
0 Petitions
Accused Products
Abstract
A method and apparatus for (1) transmitting large amounts of data between a least a first and second station over a twisted pair, (2) reducing cross talk in a network using carrierless amplitude modulation and phase modulation encoding (CAP) with independent data clock source at each station, (3) providing a relatively simple and fast data detection apparatus, (4) maintaining synchronization between stations during idle periods while minimizing cross talk, (5) providing a technique to allow filters to be trained during idle periods, and (6) providing a technique which allows automatic gain control to be used with CAP. Particular signalling symbols are associated with each of the following conditions: (1) idle state, (2) preamble, (3) start of frame detection, (4) test condition, (5) each possible combination of five binary bits representing 32 different data symbols, and (6) jam condition. For example, a unique pair of the four inner most points on the CAP 36 constellation are used for indicating idle mode. All four inner most points are used for testing the link and training the filters in the receiver.
112 Citations
22 Claims
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1. A transceiver for receiving out-of-band control signals on a receive control channel over a first twisted pair of conductors, and for receiving in-band data on a data channel over a second twisted pair of conductors, including:
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a. a first receiver, adapted to be coupled to the first twisted pair of conductors, for receiving said out-of-band control signals on a receive control channel, each out-of-band control signal being indicative of the state of the data channel; b. a second receiver, adapted to be coupled to the second twisted pair of conductors, for receiving an in-band data signal on the data channel, the second receiver having a detector for canceling control signals transmitted from the transceiver over the second twisted pair of conductors and detecting data signals during transmission of such canceled control signals from the transceiver; c. a processor, coupled to the first receiver and to the second receiver for determining the status of the data channel based upon the control signal received over the receive control channel. - View Dependent Claims (2, 3, 4)
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5. A transceiver for transmitting out-of-band control signals on a transmit control channel over a first twisted pair of conductors, and for transmitting in-band data on a data channel over a second twisted pair of conductors, including:
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a. a first transmitter, adapted to be coupled to the first twisted pair of conductors, for transmitting said out-of-band control signals on a transmit control channel over the first twisted pair of conductors; b. a second transmitter, adapted to be coupled to the second twisted pair of conductors, for transmitting said in-band data on a data channel over the second twisted pair of conductors; c. a processor, coupled to the first and second transmitter, for determining the status of the data channel based upon the transmission activity on the data channel, and causing the first transmitter to transmit control signals associated with the data channel status. - View Dependent Claims (6, 7)
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8. A transceiver for receiving out-of-band signaling on a receive control channel over a first twisted pair of conductors, and for receiving in-band data on a data channel over a second twisted pair of conductors, including:
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a. a first receiver, adapted to be coupled to the first twisted pair of conductors, for receiving an out-of-band control signal on said receive control channel, the out-of-band control signal including a clock pattern which indicates that data is presently being transmitted on the second twisted pair of conductors and a test pattern; b. a second receiver, adapted to be coupled to the second twisted pair of conductors, for receiving said in-band data signal on said data channel, the second receiver being synchronized to the clock pattern received over the first twisted pair of conductors; c. a processor for determining the status of the data channel based upon the control signal received over the receive control channel. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A transceiver for transmitting out-of-band signals on a transmit control channel over a first twisted pair of conductors, and for transmitting in-band data on a data channel over a second twisted pair of conductors, including:
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a. a first transmitter, adapted to be coupled to the first twisted pair of conductors, for transmitting the out-of-band control signals on a transmit control channel, the out-of-band control signals including a clock pattern which indicates that data is presently being transmitted on the second twisted pair of conductors, an idle pattern which indicates that no data is presently being transmitted on the second twisted pair of conductors, and a test pattern; b. a second transmitter, adapted to be coupled to the second twisted pair of conductors, for transmitting the in-band data on a data channel over the second twisted pair of conductors; c. a near-end cross-talk canceler coupled to the first and the second transmitter for receiving the in-band data transmitted by the second transmitter, and canceling the in-band data from the out-of-band control signals transmitted from the first transmitter; d. a processor, coupled to the first and second transmitters, for causing the status of the data channel to be indicated over the transmit control channel.
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16. A method for communicating, including the steps of:
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a. transmitting an out-of-band control signal on a first channel; b. canceling the transmitted out-of-band control signals from the first channel in order to detect data symbols on the first channel; c. transitioning from a first receiver state to a second receiver state upon detection of data symbols on the first channel; d. transmitting data on a second channel; e. receiving an out-of-band control signal on the second channel.
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17. A method for communicating, including the steps of:
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a. transmitting an out-of-band control signal on a first channel; b. transmitting an in-band data signal on a second channel; c. receiving an in-band data signal on the first channel; and d. receiving an out-of-band control signal on the second channel. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification