Synchronous Optical Network or SONET standards
were developed between 1984 and 1988. This was done primarily to establish
standards for incompatible equipment, establish international standards
and most recently greater bandwidth due to applications requirements. The
standard evolved from three phases: Requirements for interopability between
different vendor requirements, requirements for SONET adminsration support
and further definition of network management. There are three standards
organizations that have accepted the specifications that define SONET.
They are from ITU-T with the G.708-G.708 standard, ANSI with the T-105
standard and Bellcor with the TR-NWT-000253 standard. The frame architecture
consists of a STS-N field, OC-N field, Payload field, Envelope field, Overhead
field and Concatenation Field. The architecture layers consist of the Physical,
Section , Line and Path layers. Among the various SONET advantages are
High band width, fast transmission and support for ATM, FDDI and B-ISDN
technologies and among the various disadvantages are that it is expensive
to implement, high training requirments of this technology, and the continuous
development of the SONET network management standards.
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SONET/ATM
network testbed
SONET
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