Synchronous Optical Network (SONET)
ANSI standard for optical fiber transmission in Gbps range
- Similar to ITU-T-based, synchronous digital hierarchy (SDH)
- SDH and SONET can be easily interconnected
SONET hierarchy
- Begins with OC-1 (optical carrier level 1) at 51.84 Mbps
- Each succeeding SONET hierarchy rate is defined as a multiple of OC-1