????????? ?? ?????????? ? ???????
??????? ??? ????????? ? ??????????, ?? ??????? ??????? ? ????. ?????? "????????? ??????" OSI (Open System Interchange). ?????????? ??? ????????? ??????? ? ????? ??????? ?????? OSI. ????????? IEEE 802, ITU, ???? ?????????. ????????? ?.21, HDLC, ?.25.
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