Low Overhead Block Coding for Multi-Gb/s Links

Coles, Alistair ; Cunningham, David

HP Development Company

关键词: block coding;    16B18B;    fibre optic;   

RP-ID  :  HPL-98-168

学科分类：计算机科学（综合）

美国|英语

来源: HP Labs

【 摘 要 】

An 8B10B block coding scheme is currently employed in several fibre optic applications operating at approximately 1Gb/s. This code results in a symbol rate that is 25% greater than the data rate (i.e. 25% overhead). We describe an alternative block coding scheme which may be used to implement lower overhead coding for fiber optic multi-Gb/s links. The coding scheme is extremely simple to implement, generates a d.c. balanced signal and provides non-data codewords for control signaling. As an example, a 16B18B code (overhead 12.5%) is described. 8 Pages