Pl. let me know how can i install T1 card ( eth) in router 1841

Sir, We are having MPLS/VPN from one ISP and IPVPN from other ISP both are terminated on Cisco 2821 (A side)and 1841 (B side)Primary link is MPLS VPN L3 i.e. we want if Primary link goes down,IPVPN Link should work.

we have 3 location, all 3 is connected through L3 MPLS VPN , now we are planing to setup IPVPN for fail over but its not working in 2 location;s could u help regarding the same,After L3 MPLS link goes down IPVPN get up but same was not happen , we ha...