| http://www.w3.org/ns/prov#value | - In this manner, communications are made possible between the user terminals 21 through 24 connected to the optical loop circuits 1 and 2, and between the user terminals 21 through 24 and user terminals (not shown) connected to the second network 26. [0045] In the present specification, descriptions are made mainly centering on a network consisting of a double optical loop as shown in FIG. 1.
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