In the framework of the ACTS-SONATA project, a detailed analysis of transmi
ssion aspects has been achieved in order to assess the features and the lim
itations of the switchless network concept over a large-scale network. The
results show that the transmission of up to 400 wavelength channels is feas
ible when a bit rate of 622 Mb/s is adopted, while in the case of 500 chann
els an in-depth analysis of the cross-phase modulation effect is required.