March 2004
Intermediate to advanced
840 pages
21h 45m
English
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SONET Electrical and Optical Signals
The term OC-N refers to the optical carrier SONET transmission characteristics of an Nth level transmission link, whereas STS-N refers to the electrical SONET transmission characteristics of an Nth level transmission link where 1 <= N <= 768. SONET frames are created, multiplexed, demultiplexed, and managed electrically. As shown in Figure 5-2, user data is sent to the STS-1 multiplexing device that adds the path overhead (POH) to create the SPE. The transport overhead (TOH) is then added to create the complete SONET STS-1 frame. All of this happens in the electrical domain. Multiple electrical STS-1 frames could be multiplexed at this stage. The electrical STS-N is then fed to an optical transmitter over ...
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