  One can demonstrate that a 1-D Josephson network containing junctions with
different resistances can be synchronized at frequencies, which are multiples
of 2eV, where V is the total d.c. voltage applied across the network. The
appearance of such synchronization follows from the law of charge conservation
and takes place if charge transfer is dominated by the Josephson channel. One
can observe also a sub-harmonic structure. The result holds for cluster-based
arrays as well as for general case of a tunneling network.
