I have a backbone in SDH technology. In this network there are a lot of places that are connected together. They are urban centers and they offer data services to the access that are connected to. That access would be in Gigabit Ethernet (fiber) . Actually the costumer has some router cisco that are non able to support gigabit adapter module. Should be useful to use an architecture with switchs to serve more access and a router with 2 gigabit interface (1 for the WAN and 1 for la LAN=access end)? Could you advise me about a model of Router and a switch please? Or it should e better to use only 1 router with gigabit Etherner interface without switch? Could you tell me where can I find a possible case study equivalent please? Thank You very much.