Low energy cut-offs and hard X-ray spectra in high-z radio-loud quasars: the Suzaku view of R

We present the results from the Suzaku observation of the powerful radio-loud nquasar RBS315 (z=2.69), for which a previous XMM-Newton observation showed an nextremely flat X-ray continuum up to 10 keV (photon index Gamma=1.26) and nindications of strong intrinsic absorption (N_H~10^22 cm^{-2} assuming neutral ngas). The inst..