For Class B+ optics, this is typically 28 dB, allowing for distances up to approximately 20 km, while Class C+ optics offer a 32 dB budget, extending the reach to 60 km . Proper planning ensures reliable service delivery without signal degradation. For operators aiming. In GPON networks, the maximum physical distance between an Optical Line Terminal (OLT) and an Optical Network Unit (ONU) is often cited as 20 kilometers, but the technical reality is more nuanced. This guide. Distance between the OLT and furthest ONT must be considered - maximum reach is typically 20-25km depending on splitting used to stay within power and loss budgets. With higher split ratios, the PON network has both advantages and disadvantages.
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