| http://www.w3.org/ns/prov#value | - The rerouting and change-back system as claimed in claim 14, wherein each cell has a header and an information part, and said receiving means is formed so as to recognize the header of each cell, said means for detecting the fault including means for detecting a loss in synchronization of the received cells as determined by the headers of each of the received cells and for detecting the restoratio
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