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cisco router 1721

hello experts

I'm setting a lab for my ccna exam and encountered a problem with the Cisco router 1721.  The problem is with Wic 56/64k DSU/CSU.  I'm trying to connect it to my cable router (Arris) but it is not working. Another word the wic card is not working.  int serial0 is down/down and dont know how to get it up/up.  i did no shut but nothing is working.  I changed int serialo  to service-module 56k clock rate 56 but nothing worked.  i set dhcp and it is working fine. i set up nat but cannot get it going because im using serial0 as ip nat outside.. please help

thank you

  • Seattle Cisco User Group (SEACUG)