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Fig. 12-1: Network topologies. Fig. 12-2: Bus-coupler losses. Fig. 12-3: Linear bus topology. Fig. 12-4: Liner bus versus star coupler. Fig. 12-5: Basic STS-1 SONET frame. Fig. 12-6: Basic STS-N SONET frame. Fig. 12-7a: 2-fiber UPSR. Fig. 12-7b: 2-fiber UPSR.
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