... Inbusiness class networks, this results in optimaluptime, due to the multiple layers of protectioninvolved in a SONET network. With protection forboth the cross-connect and optical cards, singlefailure ... 9/11, security has become anincreasingly important aspect of enterprise networks. In addition to reliability, SONET networks are very secure by providing discretechannels (STS-ns or VT1.5s) ... cross-connects, which wouldcreate a series of alarms. In-Band ManagementUnlike data networks, SONET networks use an in-band channel called the Data CommunicationsChannel (DCC) for management...