Circuit Speeds
Higher-Speed Digital Lines (SONET/SDH)
- Single world-wide standard for very high speeds
- In U.S., called SONET (Synchronous Optical Network)
- In Europe, elsewhere called SDH (Synchronous Digital Hierarchy)
- OC circuit designations. Multiples of 51.84 Mbps
- OC3: 156 Mbps
- OC12: 622 Mbps
- Defined up to a few Gigabits per second