Cisco optical technology gives us faster service delivery through remote provisioning across Ethernet-enabled DWDM networks. Optical networking uses thin glass or plastic optical fiber to transmit information in the form of light pulses. It is far more reliable and offers greater transmission capacity than conventional copper-wire networks. SONET and Synchronous Digital Hierarchy (SDH) are the most common optical transport protocol standards used in optical networking. They both meet the needs of traditional voice traffic, where all traffic is high-priority and patterns are generally predictable.