Coder and Decoder of Block 7B8B Simplified with Auxiliary Channel
This work presents the coder and decoder of block 7B8B simplified with auxiliary channel. The coder 7B8B converts an input 7 bits word in an output 8 bits word. It transmits approximately an equal number of 1’s and 0’s to provide a DC constant component. It increases the transitions number, improves the system quality and security. The objective is also to improve the system potentialities with an auxiliary channel to monitor the communication (alarm.) The main channel is real, but the auxiliary channel is fictitious.
Keywords: Block Codes, Advanced digital systems, Transmission lines
 D. A. Huffman, “A method for the construction of minimum redundancy codes”, in Proceedings IRE Vol.40 pp.1098-1101, 1962.
 H. Lohscheller, “A subjectively adapted image communication system”, IEEE Transactions on Comm. Com.32, pp.1316-1322, Dec. 1984.
 S. A. Vanstone, P. Oorschot, “An introduction to error correcting codes with applications”. Klumer Academic Publishers, 1989.
 ITU-T Recommendation H.261, ”Video codec for audiovisual services at px64 kbps”, 1993.
 A. Hefez, “Introdução à teoria dos códigos”. UNICAMP, 1994.
 Joan L. Mitchell, William B. Pennebaker, Chad E. Fogg, Didier J. LeGall, “MPEG video compression standard”, 1996.
 Roopali Garg, “Line Code for Optical Fiber Communication Systems”, IETE Journal of Education, Vol. 40, No. 3-4, PP. 93-100, Ponjab - India, Jul - Dec 1999.
 Demir Oner, “Criteria for Choosing Line Codes in Data Communication”, Journal of Electrical and Electronics Engineering, Vol. 3, No. 2, PP. 843-857, Istambul 2003.
 V. Sneha Latha et al, “Performance Evaluation of Different Line Codes”, Indian Journal of Computer Science and Engineering, Vol.2, No.4, PP. 575-588, India, Aug-Sep 2011.
 Ankit Gupta, Gurashish Singh, “Implementation and Analysis of Different Line Coding Schemes using Verilog”, Internat. Journal of Science, Engineering and Technology Research, Vol. 5, I. 2, PP. 395-401, India, Feb. 2016.