Pulse or digital communications – Synchronizers – Frequency or phase control using synchronizing signal
Patent
1994-01-06
1997-04-01
Bocure, Tesfaldet
Pulse or digital communications
Synchronizers
Frequency or phase control using synchronizing signal
375322, 375372, 370395, H04L 700
Patent
active
056174535
ABSTRACT:
The desynchronizer stores information units corresponding to time slots of a PCM-stream (IN) in consecutive memory locations of a buffer memory (BM). The number of memory locations of this memory (BM) corresponds to the length of a subframe within which the desynchronizer substantially randomizes the order of the information units. This randomization is achieved by reading the stored information units in an order dictated by a permutation (A1) of the addresses of the memory locations. This permutation (A1) is substantially randomly selected from the limited number of possible permutations by a permutation device (PM) and is started simultaneously with the arrival of the first information unit of a subframe. In order to ensure that all information units are forwarded to the output stream (OUT) the mentioned permutation is repeated (A2) by a permutation repetition device (PRM) simultaneously with a new permutation (A1) corresponding to a next subframe.
REFERENCES:
patent: 4891805 (1990-01-01), Fallin
patent: 5062105 (1991-10-01), McKnight
patent: 5130975 (1992-07-01), Akata
patent: 5268935 (1993-12-01), Mediavilla et al.
Ruan et al. "An Improved Desynchronizer With Reduced Waiting Time Jitter For Digital TDM Systems." IEEE Pacific ROM Conference on Communications, Computers and Signal Processing, May 9-10, 1991. pp. 298-300.
Sari et al, "Jitter Reduction in SDH Network" ICC 91 International Conference on Communications 1991, 3 vol. XXIX pp. 1413-1417.
Robert W. Hamlin, Jr., "Designs & Performance Verification for a Sonet to DS3. Desynchronizer", 1991 IEEE.
"Application of the Multipath Self-Routing Switch in a Combined TM/ATM Cross-Connect System", B. Pauwels et al, XIV International Switching Symposium, Yokohama, Japan, Oct. 25-30, 1992, pp. 324-328.
"Technology, Distributed Control and Performance of a Multipath Self-Routing Switch", M. Henrion et al., XIV International Switching Symposium, Yokohama, Japan, Oct. 25-30, 1992, pp. 2-6.
ALCATEL N.V.
Bocure Tesfaldet
Webster Bryan
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