Abstract
A physical layer coding scheme is designed to make optimal use of the available physical link, providing functionality to higher components in the network stack. This paper presents results of an exploration of the errors observed when an optical gigabit Ethernet link is subject to attenuation. The results show that some data symbols suffer from a far higher probability of error than others. This effect is caused by an interaction between the physical layer and the 8B/10B block coding scheme. The authors illustrate how the application of a scrambler, performing data whitening, restores content-independent uniformity of packet loss. They also note the implications of their work for other (N, K) block-coded systems and discuss how this effect will manifest itself in a scrambler-based system. A conjecture is made that there is a need to build converged systems with the combinations of physical, data link, and network layers optimized to interact correctly. In the meantime, what will become increasingly necessary is both an identification of the potential for failure and the need to plan around it.
Original language | English |
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Pages (from-to) | 3056-3065 |
Number of pages | 10 |
Journal | Journal of Lightwave Technology |
Volume | 23 |
Issue number | 10 |
DOIs | |
Publication status | Published - 1 Oct 2005 |
Funding
Manuscript received December 1, 2004; revised July 6, 2005. A. Moore acknowledges Intel Corporation’s generous support of his research fellowship and L. James thanks the Engineering and Physical Sciences Research Council (EPSRC) and Marconi for their support of her Ph.D. research. A. W. Moore is with the Computer Laboratory, University of Cambridge, Cambridge CB2 1TN, U.K. (e-mail: [email protected]). L. B. James, A. Wonfor, R. G. Plumb, I. H. White, and R. V. Penty are with the Center for Photonic Systems, Department of Engineering, University of Cambridge, Cambridge CB2 1TN, U.K. M. Glick and D. McAuley are with Intel Research, Cambridge CB3 0FD, U.K. Digital Object Identifier 10.1109/JLT.2005.856275
Keywords
- Codecs
- Data communications
- Networks
- Optical communications
- Systems engineering
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics