ATM technology (9)
SONET / SDH - Synchronous Optical Network / Synchronous Digital Hierarchy
physical layer standard for fiber optic transmissions standardized by ANSI and recommended by CCITT
SONET is the carrier format used in the USA in which OC3c corresponds to a 155 Mbps
SDH is a European carrier system in which STM-1 corresponds to 155 Mbps
ATM and SMDS operates on top of SONET
interface rates: OC1, OC3, OC9, OC12, OC18, OC24, OC36, OC48
- OC-3c/STM-1 SONET/SDH
- OC-12c/STM-4c SONET/SDH
fiber based or microwave based (OC3, 6 GHz)