Not all services are created equal. They differ from bit-rate to quality requirements and level of survivability. Packet networks face challenges meeting some of the stringent requirements for high-performance services such as low-latency, lossless, high-bit rate, and deterministic sub-50 ms resiliency. OTN provides a deterministic and simple service delivery model that complements packet networks through its unique features and capabilities such as service transparency, end-to-end monitoring, and built-in measurement for latency—all complementary to meeting the stringent requirements of high-fidelity and special services.