Complete Protocol dictionary, glossary and reference
SDH: Synchronous Data Link Hierarchy
Synchronous Data Link Hierarchy (SDH) is a European standard for data transmission over optical fiber network equivalent to SONET of North America. SDH's basic unit, the STM-1 (Synchronous Transport Module-level 1), operates at 155.52 Mbit/s. Transmission rates of up to 10 Gbit/s can be achieved in today's SDH systems, and the 40 Gbit/s systems are possible. SDH systems are fully compatiable to SONET systems.
G.707, G. 708 and G.709