The Transport Network Infrastructure
The transport network includes two main infrastructures. The first is the PDH, also known as T-carrier, E-carrier, and J-carrier wideband transmission standards. This infrastructure was first introduced in the early 1960s. The second infrastructure of the transport network is the Synchronous Digital Hierarchy (SDH; ITU terminology), also known as Synchronous Optical Network (SONET; ANSI terminology), which was first formalized and standardized in 1988. SDH/SONET is the second generation of digital hierarchy, and it is based on a physical infrastructure of optical fibers.
PDH and SDH/SONET are voice-centric circuit-switched network models that switch millions of 64Kbps circuits between various switching points. ...
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