What is SONET?
What will be an ideal response?
The term Synchronous Optical NETwork (SONET) in North America, is known as the
Synchronous Digital Hierarchy (SDH) in Europe. SONET uses time-division multiplexing to multiplex
the circuits onto an underlying fiber. SONET permits a physical ring to be constructed with the
purpose of providing redundancy. A device known as an Add-Drop Multiplexor is used to connect a site
to a SONET ring. The term arises because the Add-Drop Multiplexor either inserts or terminates a set
of data circuits that each connect to another Add-Drop Multiplexor on the ring. SONET specifies
details such as how data is framed, how lower-capacity circuits are multiplexed into a high-capacity
circuit, and how synchronous clock information is sent along with data. SONET and the associated
TDM hierarchy was originally designed as a system to carry digital voice telephone calls.
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