eSwitch_USB / wifiSwitch_USB is a router and access point using WAN and/or the dial-up modem. It could be used as a regular router connected to ADSL or the cable modem and also as a PPP router using modems to dial up to ISP through its USB port. The dial-up USB modems could be PSTN V.90, GPRS, CDMA, EVDO, 3G / 3.5G HSDPA and Edge modem, etc.
The router will use WAN as the first priority and the dial-up modem as the backup. Once the WAN port is active, it will switch to WAN and disconnect the dial-up connection. The router will automatically dial to ISP if WAN is not active and there is data to be transmitted.