Hybrid line coding method and apparatus using 4B/3T encoding for

Details Hybrid line coding method and apparatus using 4B/3T encoding for Hybrid line coding method and apparatus using 4B/3T encoding for

1994-07-22

1997-05-27

Chin, Wellington

Pulse or digital communications

Multilevel

375293, 341 57, 370509, H04L 2549

Patent

active

056338929

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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"Sequence-State Coding for Digital Transmission", P. Franaszek, Bell System Technical Journal, Nov. 1967, pp. 143-157.
"48 PCM Channels on T1 Facilities", E. Schnegelberger et al, Proceedings of the National Electronics Conference, 1975, vol. 30, pp. 201-205.
"Ternary Line Codes", J. Buchner, Philips Telecommunication Review, vol. 34, No. 2, Jun. 1976, pp. 72-86.

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