  Universal (pointwise uniform and time shifted) truncation error upper bounds
are presented for the Whittaker--Kotel'nikov--Shannon (WKS) sampling
restoration sum for Bernstein function classes $B_{\pi,d}^q,\, q>1,\, d\in
\mathbb N$, when the decay rate of the sampled functions is unknown. The case
of regular sampling is discussed. Extremal properties of related series of sinc
functions are investigated.
