Look up: sdh

1. 
   SDH
   Synchronous Digital Hierarchy
   Found on http://www.geocities.com/ikind_babel/bab
   
   
2. 
   SDH
   Synchronous Digital Hierarchy, standards for high bandwidth fibre optic networks defined by European Telecommunications Standards Institute outside North America. SONET is the US equivalent defined by the American National Standards Institute (ANSI).
   Found on http://www.flying-boat.co.uk/glossary/
   
   
3. 
   SDH
   (In topic `Network Architectures`) SDH (Synchronous Digital Hierarchy) is an international standard for the transmission of synchronous data over fibre-optic cables. SONET is the European equivalent of SONET used in North America (see SONET).
   Found on http://www.it-architects.co.uk/a_-_z_glo
   
   
4. 
   SDH
   Synchronous Digital Hierarchy
   Found on
   
   
5. 
   SDH
   `SDH` may refer to: * Saradhna, a railway station in India * The Shubnikov-de Haas effect, also see Fermi surface * Social Democrats of Croatia * Society for Digital Humanities * Subdural hematoma * Succinate dehydrogenase * Subtitles for the deaf and hard of hearing, see Subtitle (captioning) * Synchronous Digital Hierarchy, in telecommunications
   Found on http://en.wikipedia.org/wiki/SDH