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   ocr: Seron Resealers D nordron matolexed Figure 2 SONET is typically deployed over optical fiber in a dual-ring fashion. Add/drop multiplexers insert and remove user: payloads to and from the frames circulating in the ring. Repeaters amplify and synchronize the signal as required.The section layer of the SUNET protocol stack operates between repeaters, while the line layer operates between muitiplexers. The path layer manages end- to-end communications