Hello! I (think) I am following the correct NCL syntax here...but.. ncl> create node 0 routing circuit csmacd-0 type = csma-cd ncl> set node 0 routing circuit csmacd-0 data link entity csma-cd ncl> set node 0 routing circuit csmacd-0 enable phaseiv address true ncl> enable node 0 routing circuit csmacd-0 Node 0 Routing Circuit csmacd-0 AT 2013-02-13-13:05:26.514-05:00I----- FAILED IN DIRECTIVE: Enable DUE TO: Error specific to this entity's class REASON: Open Port Failed Description: The Open Port call to the specified Data Link failed Any ideas what i'm doing wrong?