Hybrid line coding method and apparatus using 4B/3T encoding for payload bits and 1B/1T encoding for framing information
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United States of America Patent
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May 27, 1997
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N/A
app pub date -
Jul 22, 1994
filing date -
Jul 22, 1994
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Expired
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Abstract
Existing infrastructures such as DS1 or E1 are used at currently accepted rates to carry a third more information by using a hybrid encoding technique wherein a 4B3T encoding is done for the payload bits, while a 1B1T encoding technique is used for framing information. In this way, for example, a DS1 can be used at 1.54 Mbit per second to carry 2.058 Mbits of binary payload, while respecting the 8 kilobits of framing expected by DS1 hardware. Similarly, for example, an E1 infrastructure can be used at the accepted 2.048 Mbit per second rate to carry 2.560 Mbits of binary payload plus 128 kilobits of binary framing/CRC without having to change the accepted E1 framing techniques.
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