What is SDH Network? The SDH network works with a single central clock that synchronizes all the elements in the network.
What is TM? It is Terminal Multiplexer.It is used for multiplexing local tributaries (low rate) to the STM-N (high rate) aggregate.
What is Regenerator? It is used for regenerating the (high rate) stm-N when the distance between two sites is longer than the transmitter can carry.
What is ADM? It isThe Add And Drop Multiplexer. It passes the (high rate) stm-N through from his one side to the other and has the ability to drop the STMs.
What is DXC? It is Digital Cross Connect. It receives several (high rate) STM-N and switches any of their (low rate) tributaries between them. It is used to connect between several topologies