H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
344/1
H04Q 1/20 (2006.01) H04L 1/00 (2006.01) H04L 12/56 (2006.01)
Patent
CA 2032774
Abstract Method of Restoring the Correct Cell Sequence, Particularly in an ATM Ex- change, and Output Unit therefor It is known that, to be able to load an ATM switching network as uniformly as possible (also for short periods of time) and, thus, keep costs low, the successive cells of one and the same connection are routed to the output by as many different paths as possible. A problem with this is that mutual overtaking of successive cells must be avoided or corrected. In the present invention, each cell is held at the output until it is certain that no older cell can be buffered in the switching network. before the cell is passed on, a check is made to determine whether the cells received from the switching network later include an older cell which must be passed on before that cell. At the input end, consecutive numbers ("Sequence Numbers") are allocated to the cells (on a per-connection basis or not). A buffer at the output end is operated, at least in part, in the manner of a shift register, thereby introducing a predetermined delay. Prior to the output of a cell, at least the shift-register-like portion of the buffer is examined as to whether a cell written in later is to be put out earlier, if so, the two cells are interchanged.
Cesar Bozo
Eilenberger Gert
Pfeiffer Bodo
Schrodi Karl
Wahl Stefan
Alcatel N.v.
Smart & Biggar
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