I am working with a customer that has an E3 fiber coming into their site. Right now it is going into a multiplexer that is broken out into 16 seperate e1 connections that go out to several different tail sites. I am wondering if there is a Cisco card available that I can have the e3 connect direclty into the cisco router. Then do I need to configure frame-relay of some sort to connect to all the distant end sites? Sorry I am fairly new to all this and am trying to find the best solution.