what is sdh,pdh?how exactly the call get connected?
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Answer Posted / anuj
Pdh is plesichronus digital heirarchy. and its weakness are
asynchronus structure near to synchronus, resticted
managemenct capacity,Non availability of international
standard and no optical interfaces.
Sdh is syncronus digital heirarchy and its advantage over
pdh are optical interface,ad and drop
facility,international standard digital format.
SDH are of diff type STM1,STM4 etc
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