March 2004
Intermediate to advanced
840 pages
21h 45m
English
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SONET Layers
SONET has four optical interface layers, which are depicted in Figure 5-3 and are as follows:
Path
Line
Section
Photonic
Path Layer
The path layer deals with the transport of services between the path-terminating equipment (PET) NEs. The main function of the path layer is to map the signals into a format required by the line layer. Its functions include reading, interpreting, and modifying the POH for performance and APS.
Path-Terminating Equipment (PTE)
The STS PTE is an NE that multiplexes or demultiplexes the STS payload. As an example, STS-1 PTE assembles 28 1.544-Mbps DS1 signals and ...
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