中国斜学巷术大学 信息网偏与协议 VERIITY OF SCIENCE AND TECHNOLO0YO年C框NA Switched Virtual Circuit (SVC) UNI=User-to-NetworkInterface NNI=Network-to-Network Interface Input Output Input Output Port VPINCI Port VPINVCI Port VPIVCI Port VPINCI 1 29 3 45 1 29 3 45 1 64 3 29 64 3 29 3 29 1 64 3 29 1 64 UNI Signaling UNI NNI Signaling 2 3 Signaling B 3 Input Output Input Output Port VPIVCI Port VPWVCI 2 Port VPIVCI Port VPIVCI 45 2 16 16 2 43 2 52 1 29 64■ 3 29 643 29 3 29 64 3 29 64 Transfer data over newly established link信息网络与协议 Switched Virtual Circuit (SVC) B D UNI Signaling NNI Signaling C UNI Signaling Input Output Port VPI/VCI Port VPI/VCI 1 64 3 29 3 29 1 64 Input Output Port VPI/VCI Port VPI/VCI 2 52 1 29 1 64 3 29 3 29 1 64 Input Output Port VPI/VCI Port VPI/VCI 1 29 3 45 1 64 3 29 3 29 1 64 Input Output Port VPI/VCI Port VPI/VCI 1 64 3 29 3 29 1 64 A 1 29 3 45 1 45 2 16 1 16 2 43 1 2 4 1 3 3 2 4 2 1 3 Transfer data over newly established link UNI = User-to-Network Interface NNI = Network-to-Network Interface