PON Optical Distribution Network (ODN) Classes
ODN classes define expected optical loss ranges for GPON/XGS-PON networks. The test set applies threshold levels automatically based on the selected ODN class in the OPM Setup screen. This ensures consistent evaluation without manual input.
Factors affecting thresholds include:
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Measurement location (central office, splitter, customer drop).
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PON type (GPON vs. XGS-PON).
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ODN class (A, B, C, etc., as defined by ITU-T standards).
Results are displayed as PASS/FAIL according to the correct optical level thresholds. Technicians can trust the analyzer to align with industry standards or operator-defined limits.
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PON Test Profile
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1G Only
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1G+10G or 10G Only
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Network Type
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A/B/E/G-PON
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G-PON
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XGS-PON
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Downstream Wavelength
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1490 nm
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1490 nm
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1577 nm
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Downstream Passband
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1480 nm to 1500 nm
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1480 nm to 1500 nm
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1575 nm to 1580 nm
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PON Class
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A
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B
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B+
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C
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Ext C+
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Ext D
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B+
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C+
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10G-N1
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10G-N2
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E1
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E2
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OLT Site Thresholds (dBm)
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0 to +4
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+5 to +9
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+1.5 to +5
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+3 to +7
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+3 to +7
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+6 to +10
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+2 to +5
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+6 to +9
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+2 to +5
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+4 to +7
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+6 to +9
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+8 to +11
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ONT Site Thresholds (dBm)
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-21 to -1
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-21 to -1
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-27 to -8
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-28 to -8
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-30 to -8
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-30 to -8
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-27 to -8
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-27 to -8
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-28 to -9
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-28 to -9
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-28 to -9
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-28 to -9
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ITU-T Standards
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G.984.2 2019/08
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G.9807.1 2020/10 Amd2
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For latest revisions of GPON standards, please visit https://www.itu.int/rec/T-REC-G.984.2-201908-I and for XGS-PON standards, please visit https://www.itu.int/rec/T-REC-G.9807.1/en.