Synchronous Optical Networking and Synchronous Digital Hierarchy
Synchronous Optical Networking (SONET) and Synchronous Digital Hierarchy (SDH) are both circuit-based technologies that deliver very high-speed service over optical networks using a ring topology. This type of topology offers fault tolerance, redundancy, and the capability of being highly available. SONET functions using the following Layer 2 technologies:
- Packet over SONET (POS)
Speed measurements for SONET are offered in the form of Optical Carrier Rates. Various bandwidth measurements and standards are as follows:
- OC-1: 51.85 Mbps
- OC-255 . . .
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