I am trying to configure a coonection between a CSS 11503 and a 3750 switch via a fiber to RJ45 converter and got problem to get connectivity. By the way i am also having the same issue to set up my ISC link between my two CSSs (both are CSS 11503). I have disabled the Auto negotiation, i am getting the link but no ip connectivity. Both interface (ISC port and interface 2/2) are up, the vlan 1 associtated to my port 2/2 is also up and ip enabled but i am not getting any ip connectivity. Can someone help?