An input distribution packet switch network includes a plurality of
2.times.2 switch elements and packet input modules for the switch network.
The switch elements are arranged in multistage and connected in accordance
with Shuffle type topology to constitute a N.times.N switch network
(N=2.sup.k, k: integer number of 2 and over). The links of the leftmost
and rightmost switch elements are connected to one another so that the
N.times.N switch network can have a ring architecture. The packet input
modules are distributed laterally in the switch network.
