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Model: Loss = fibre·length + 0.10 dB/splice + 0.30 dB/connector pair + splitter IL (1:2 3.6 · 1:4 7.2 · 1:8 10.5 · 1:16 13.7 · 1:32 17.1 · 1:64 21.0 dB) + margin. Budgets: GPON B+ 28 dB, C+ 32 dB; XGS-PON N1 29 dB, N2 31 dB.
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