I need a solution where I can have ADSL PPPoE as a primary link for VoIP and internet access. I need a secondary link which is cable as backup. I thought of purchasing a 1700 series modular router and plug in cards but the problem is that the Cable card, HWIC-CABLE-D-2 is not compatible with 1700 (http://www.cisco.com/en/US/products/hw/modules/ps3129/products_data_sheet0900aecd804b4478.html)
and if I think of using a 1800 series router the ADSL, WIC-1ADSL card is not compatible (http://www.cisco.com/en/US/products/ps6350/products_configuration_guide_chapter09186a0080454f6a.html)
Same problem with 2600 and 2800 series. The office is not very big so a huge investment is not possible. Any one has any ideas or know of any platforms that support both ADSL and Cable cards.