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Superconducting (SC) superlattices (SL) of the epitaxial semiconductor$PbTe-PbS$/(001) $KCl$ with two-dimensional ordered misfit dislocation (MD)networks across heteroboundaries (HB) are studied, and the obtained results arecompared with the corresponding data for $YBaCuO$. An analysis of thefluctuational region showed that the pairing of electrons in SL takes place atthe sites of dislocation networks. In the region of SC fluctuations, the IVCderivatives of point-contacts (PC) based on SL and HTS display ametal-insulator transition associated with delocalization of carriers from thevicinity of the structural elements responsible for the emergence of SC. Thecritical current density in a superlattice is determined, and a mechanism isproposed for formation of excess current on the IVC of PC based on SL and HTS.The values of the energy gap $\Delta_0$ at low temperatures in units of $kT_c$are found to be anomalously large for SL and HTS. For anisotropicthree-dimensional SL with a strong bond between two-dimensional SC planes, twogaps emerge from the MD. For quasi-two-dimensional SL with a weak bond betweentwo-dimensional SC planes, the $\Delta(T)$ dependence is nonmonotonic, and thefluctuation region for these SL and for HTS reveals a gap that is practicallyindependent of temperature. The IVC derivatives of a $Cu$-SL PC reveal anoscillating structure which is restricted to an energy of $90\ meV$ and isapparently associated with the electron-phonon interaction. It is assumed thatthere is a similarity between the SC mechanisms in SL and HTS. pacs 73.40.Jn,74.25.Kc, 74.45.+c, 74.50.+r., 73.40.-c, 74.78.-w, 74.78.Fk, 74.20.Mn,74.40.+k.-n, 74.45.+c, 74.62.Dn, 74.70.Ad

Point-contact studies of semiconductor $PbTe-PbS$ superconducting superlattice as a model of HTS