Abstract :
This paper discusses recent advances in the theory and applications of scrambling techniques for digital lightwave transmission. It introduces the theories of sequence space and shift register generator (SRG) space which enable systematic analysis and mathematical manipulation of the behavior of sequences in general and the related SRG´s. It discusses the behavior and realization of frame synchronous scrambling (FSS) and distributed sample scrambling (DSS) with emphasis on parallel sequences and the related parallel SRG´s (PSRG). In addition, it describes self synchronous scrambling (SSS). Then the paper applies the theories to today´s lightwave transmission systems by demonstrating practical parallel designs of FSS for SDH/SONET transmission, DSS for cell-based ATM transmission, and SSS for SDH-based ATM transmission. It finally considers how DSS can be used for scrambling of mixed isochronous and nonisochronous data in future high-speed data networks. The paper employs various new concepts and terminology, such as PSRG engine, generating vector discrimination matrix, (M,N) PSRG, sampling vector, correction vector, correction matrix, predictable scrambling concurrent sampling, and immediate correction
Keywords :
SONET; asynchronous transfer mode; binary sequences; cryptography; encoding; optical fibre communication; sequences; synchronisation; synchronous digital hierarchy; PSRG engine; SDH-based ATM transmission; SDH/SONET transmission; cell-based ATM transmission; correction matrix; correction vector; digital lightwave transmission; distributed sample scrambling; frame synchronous scrambling; generating vector discrimination matrix; immediate correction; mixed isochronous/nonisochronous data; parallel designs; parallel sequences; predictable scrambling concurrent sampling; sampling vector; scrambling techniques; self synchronous scrambling; sequence space; shift register generator space; Asynchronous transfer mode; Clocks; Decision support systems; Frequency selective surfaces; Optical fiber LAN; Optical transmitters; SONET; Sampling methods; Synchronous digital hierarchy; Terminology;
