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洹� �썑 ����삎 而댄벂�꽣 �젣議곗뾽泥대뱾�룄 媛숈�� �궗怨좎쓽 �꽕怨꾩궗�긽�쓣 媛뽯뒗 �꽕�듃�썙�겕 �븘�궎�뀓泥섎�� 媛쒕컻�빐 �솕�쑝�굹, SNA媛� �궗�떎�긽�쓽 �몴以� �븘�궎�뀓泥섎줈 �뤌 �엳�떎. IBM�쓽 �븯�뱶�썾�뼱 諛� �냼�봽�듃�썾�뼱 �젣�뭹�쓽 �깭諛섏�� �씠 SNA瑜� 諛뷀깢�쑝濡� 留뚮뱾�뼱議뚮떎.
SNA�뒗 �넻�떊�젣�뼱�옣移섎�� �샇�뒪�듃濡쒕���꽣 �룆由쎌떆耳� �샇�뒪�듃�쓽 遺��븯瑜� 寃쎄컧�떆�궎硫� �넻�떊泥섎━�뒗 �넻�떊�젣�뼱�옣移섏쓽 �꽕�듃�썙�겕 �젣�뼱�봽濡쒓렇�옩�뿉 �쓽�빐 �씠猷⑥뼱吏��뒗�뜲, �씠 諛⑸쾿��� �깉濡쒖슫 寃껋�� �븘�땲吏�留� �넻�떊�쓽 怨꾩링援ъ“瑜� 紐낇솗�엳 �뻽�떎�뒗 �젏�뿉�꽌 �꽕�듃�썙�겕 �븘�궎�뀓泥섎씪怨� 遺덈젮吏�怨� �엳�떎.
SNA媛� �굹�삩 紐⑹쟻(1974�뀈 IBM �떆�뒪�뀥 怨좉컼�뱾�쓽 �궗�꽕�꽕�듃�썙�겕濡� �젣怨�)
- Network 愿�由щ�� Application �봽濡쒓렇�옩怨� 遺꾨━
- �넻�떊 �쉶�꽑 �젣�뼱�뿉 愿��븳 紐⑤뱺 湲곕뒫�쓣 NCP�뿉寃� �씪�엫�븿�쑝濡쒖뜥 SYSTEM Load 遺꾩궛
- �뼱�뼡 Terminal�뿉�꽌�룄 Application Program怨� �넻�떊 媛��뒫
- Network�쓽 �슚�쑉 利앸��
SNA�쓽 session�꽦由쎄낵�젙
- SSCP-PU session
SSCP(System Service Control Point)�뒗 VTAM�뿉 implemented�릺�뼱 �엳�쑝硫�
�꽕�듃�썙�겕 愿�由�, 蹂듦뎄, session�솗由� �벑�쓽 �씪�쓣 �븳�떎. �씠 sscp媛�
PU(physical unit:3745, 3174�벑�벑)��� connection�쓣 留븐쓬�쑝濡쒖뜥
�씠 援ш컙�궗�씠�뿉 �넻�떊�씠 媛��뒫耳� �맂�떎.
- SSCP-LU session
SSCP媛� device�븞�뿉 �젙�쓽�릺�뼱 �엳�뒗 LU瑜� active�떆�궡�쑝濡쒖뜥 SSCP-LU session�씠�꽦由쏀븯寃� �맂�떎.
- LU-LU session
�쐞�쓽 session�뱾�씠 �꽦由쏀븯怨� �떒留륧U痢≪뿉�꽌 character coded request瑜� 蹂대궡寃뚮릺硫� host application(Primary LU)怨� �떒留륧U(Secondary LU)�궗�씠�뿉 session�씠 �꽦由쏀븯寃� �맂�떎.
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