????
???? ????? ????????? ??????? ?????? PPR ? ????? ???? ????????? ???????? ??????? ????? ??????? DN ? dn (??? DN20 = dn25) ? ????? ????? ???? ?????? ?????? ??????? ???????? (S5 / S4 / S3.2 / S2.5) ? ??? ?? ??? ??? ????? ?????? ???????? (dn20) ? ?????? ??????? (dn110) ????? ?????? ???????????? ?????? ? ?? ???? SDR ??????? ???? ????? ? ???? ????????? ?????? ????? ??????? ? ?????? ????? ??????.