Point to Point Protocol
???????? ???? ??? ???? ????????? . . 3. ????? ??? ????????? ????????? . ??? ????? ?????? ?????? ???? ???? ???? ?????? ??????? ????? ??? ?????? ??? ??????? ??????? ?? ???? ?????? ?????? ??????? .????? ??? ????? ???????? (NRZ-L) ,(HDB3) , (AMI). ???? ?? ????? ?????? ????? ?????? ???????. ???? ??? ??
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