Smartphone0 to Cell Tower0Smartphone1 to Cell Tower1Smartphone2 to Cell Tower2 in 3G/4G819HGW to Cell Tower2 in 3G/4GPC14 connect(Wireless) 819HGW819HGW set DHCP to PC14 "200.200.200.0/24"Central Office Server0 set DHCP to Smartphone0~2 "172.16.1.0/2...