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| Fibre Channel | |
|---|---|
| Layer 4. Protocol mapping | |
| LUN masking | |
| Layer 3. Common services | |
| Layer 2. Network | |
| Fibre Channel fabric Fibre Channel zoning Registered state change notification | |
| Layer 1. Data link | |
| Fibre Channel 8b/10b encoding | |
| Layer 0. Physical |
In telecommunications, 8b/10b is a line code that maps 8-bit words to 10-bit symbols to achieve DC balance and bounded disparity, and at the same time provide enough state changes to allow reasonable clock recovery. This means that the difference between the counts of ones and zeros in a string of at least 20 bits is no more than two, and that there are not more than five ones or zeros in a row. This helps to reduce the demand for the lower bandwidth limit of the channel necessary to transfer the signal.[1]
An 8b/10b code can be implemented in various ways with focus on different performance parameters. One implementation was designed by K. Odaka for the DAT digital audio recorder.[2] Kees Schouhamer Immink designed an 8b/10b code for the DCC audio recorder.[3] The IBM implementation was described in 1983 by Al Widmer and Peter Franaszek.[4][5]
- ^ Kees Schouhamer Immink (March 1997). "Performance Assessment of DC-Free Multimode Codes". IEEE Transactions on Communications. 45 (3): 293–299. doi:10.1109/26.558690.
The dc-balanced or dc-free codes, as they are often called, have a long history and their application is certainly not confined to recording practice.
- ^ US 4,456,905, "Method and apparatus for encoding binary data", published 1984-06-26
- ^ US 4,620,311, "Method of transmitting information, encoding device for use in the method, and decoding device for use in the method", published 1986-10-28
- ^ Al X. Widmer, Peter A. Franaszek (1983). "A DC-Balanced, Partitioned-Block, 8B/10B Transmission Code". IBM Journal of Research and Development. 27 (5): 440–451. doi:10.1147/rd.275.0440. Archived from the original on May 30, 2009. Retrieved April 5, 2005.
- ^ US 4,486,739, "Byte oriented DC balanced (0,4) 8B/10B partitioned block transmission code", published 1984-12-04