  We introduce the notion of cascade connection of multiparametric discrete
time-invariant linear dynamical systems with unit delay. This allows us to
construct the explicit example of conservative realization of a decomposable
operator-valued function $\theta (z_1, z_2)=\theta_2(z_2)\theta_1(z_1)$, where
$\theta_1$ and $\theta_2$ are inner operator-valued functions on the unit disk,
vanishing at zero, and discuss some properties of such realization.
