中国钟学我术大草 信息网给与协议 VERIITY OF SCIENCE AND TECHNOLOOY O年C框NA ATM: 虚电路 ·虚电路VPI和VCI来标识 -VPl:Virtual Path Identification, 虚路径标识 -VCl:Virtual Channel ldentification, 虚通道标识 Virtual Channels (VC) ATM Physical Link Virtual Path(VP) 虚电路连接VCC) E3 0C-2 Virtual Path(VP) Virtual Channels (VC) Virtual Path (VP) Virtual Channel(VC) Contains Multiple VCs Logical Path Between ATM End Points Connection Identifier VPI/VCI信息网络与协议 ATM：虚电路 • 虚电路VPI和VCI来标识 – VPI：Virtual Path Identification，虚路径标识 – VCI：Virtual Channel Identification，虚通道标识 ATM Physical Link 虚电路连接 (VCC) Virtual Path (VP) Contains Multiple VCs Virtual Channel (VC) Logical Path Between ATM End Points Virtual Channels (VC) Virtual Channels (VC) E3 OC-2 Virtual Path (VP) Virtual Path (VP) Connection Identifier = VPI/VCI