wireless lans

                lan          wan              man

wired         token ring    xdsl             MPLS(類似專線)
              FDDI          frame relay      L3 VPN
              Ethernet      atm              L2 VPN                             sdh sdnet

              802.11a 54M    2G-WAP
wireless            b 11M    2.5G-GPRS(112K)     802.11(Last mile)
                    g 54M    3G-WCDCA (786K)
                    n 300M   3.5G-HSDPA (7.2M)

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