Cisco Network Solutions for the Telco DCN: SONET/SDH OSI Environments

This paper is directed to Competitive Local Exchange Carriers (CLECs), incumbent Local ExChange Carriers (ILECs), and Post, Telephone and Telegraphs (PTTs), collectively referred to as telcos (short for telephone companies). This paper describes Cisco network solutions for transporting data between Synchronous Optical Network (SONET) and Synchronous Digital Hierarchy (SDH) and the Operations Support System (OSS) in a telco Data Communications Network (DCN). The DCN transports network management traffic between network elements and their respective OSS, making them a vital link between the service network and the network operations center (NOC).