Unfortunately you have the wrong type of router for use with ADSL. You need a *COMBINED* "Router & ADSL Modem" which replaces the USB Modem.
The Linksys WRT54GC is suitable for the Virgin Media (NTL/Telewest) Cable broadband service.
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Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.