Bandwidth efficiency MBNB coding and decoding method and apparatus
US5606317A · kind A · utility
22Cited by
8References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 9, 1994 |
| Grant date | Feb 25, 1997 |
| Priority date | — |
| Expiry date | Dec 9, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/4908
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for encoding and decoding m-bit groups of digital data, where m is at least eight, into serial n bit groups such that each encoded serial n-bit group has sufficient data transitions therein to maintain the synchronization of a phase locked loop clock recovery circuit in a high speed serial link of a communication path. Further, this method and apparatus provides a duty cycle that is within an operational range of the ideal 50 percent, which reduces voltage drift of a.c. coupled high speed serial data links, or reduces thermal drift of optically coupled high speed serial data links.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.