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Draytek AFM-102 Analogue Modem for Vigor2820
If you rely on your Internet connection, you can allow for ADSL failure by adding dial-up backup to your Vigor2820. Dial-up backup uses a 'good old-fashioned' analogue modem to dial a backup ISP in the event your ADSL line or ISP fails, either temporarily or for an extended period. The add-on analogue modem (seen below) provides 'V92' connections (up to 52000bps downstream speed) which is somewhat slower than your broadband connection but certainly usable for light web browsing, email and all other online activities which you really can't do without.
The Vigor 2820 will detect when your ADSL connection fails and automatically start the dial-up connection using the modem which is connected to the router's USB port. Once ADSL service is restored, the router will hang-up the dial-up call. Note : The modem is an optional accessory, not included with the router.
As well as backup to your ASDL connection, you can use dial-up connection permanently without ADSL line. This is ideal for shared Internet access, or wireless access to the Internet in temporary locations where an ADSL line isn't available, and an alternative to the 3G modem solution also available on the Vigor 2820.