8 port asynchronous/stnchronous

hi, I've got cisco 3640 router with one single port serial wan interface card and 8 port async/sync network module ,the wan interface card is connected to frame-relay services.When I try to connect second frma-relay connection to one of the 8 async/sync port,it's failed.May I know what is the di

migration standby router

hi, My company plan to migrate a frame-relay connection to another service provider,the new service provider provide a new router .We plan to have two connections concurrent running until the new connection is stable.I would like to know how to configure the router. __