中国钟学我术大草 信息网给与协议 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 VPIVCI Port VPINCI Port VPIVCI Port VPINCI 1 29 3 45 64 3 29 64 3 29 3 29 1 64 3 29 1 64 UNI Signaling UNI NNI Signaling 2 3 Signaling Input Output 2 Input Output Port VPIVCI Port VPIVCI Port VPINVCI Port VPINCI 2 52 1 29 64 3 29 D 64 3 29 3 29 1 64 3 29 1 64 Dynamically set up connections via signaling信息网络与协议 Switched Virtual Circuit (SVC) B D 1 2 4 1 3 3 2 4 2 1 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 3 UNI = User-to-Network Interface NNI = Network-to-Network Interface Dynamically set up connections via signaling