PARALLEL REALIZATIONS OF DISTRIBUTED SAMPLE SCRAMBLERS FOR APPLICATIONS TO CELL-BASED ATM TRANSMISSION

In this paper, a theory is developed in support of parallel realizatio ns of the distributed sample scramblers (DSS) in the cell-based ATM tr ansmission environment. For the relevant parallel realizations of the SRG (shift register generator) engines and the SRG sequence-generating circuits, the PSRG theory is applied which is readily available for p arallel FSS (frame synchronous scrambler). For the synchronization of the parallel DSS, the double-sampling and double-correction schemes ar e employed as they efficiently match the two adjacently located sample conveyance channels within the ATM cells. The resulting synchronizati on conditions are described in terms of three theorems-one regarding t he sampling time and vector's condition, and the other two regarding t he correction time and vector's conditions for even-and odd-lengthed S RG's. Demonstration is given at the end on the use of the developed th eory for parallel realizations of DSS in scrambling and descrambling t he ITU-T recommended cell-based ATM signals.