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This paper reports the main results obtained in the framework of the COST23
9 project on the implementation of transparent optical network schemes to c
onnect main European cities. The investigation on transmission limitations
has shown that transmission systems, for which 16x2.5 Gbit/s WDM systems ar
e used due to traffic reasons, have a maximum range shorter than 1000 km. T
his condition does not allow a completely transparent network. Two solution
s, the partitioned and the gridconnected network architecture, are proposed
, described, and compared in the paper.