Optical Diagnostics
RX power per port, fleet distribution and link budget engineering
Fleet average RX
-20.6 dBm
Strongest port
PON4 · -18.5 dBm
Weakest port
PON3 · -22.7 dBm
ONUs at risk
2
OLT-side RX per PON port
Excellent ≥ −18 · Good ≥ −24 · Warning ≥ −27 · Critical ≥ −29 · LOS < −31
-19.9
PON1
-21.3
PON2
-22.7
PON3
-18.5
PON4
-19.9
PON5
-21.3
PON6
-22.7
PON7
-18.5
PON8
-19.9
PON9
-21.3
PON10
-22.7
PON11
-18.5
PON12
-19.9
PON13
-21.3
PON14
-22.7
PON15
-18.5
PON16
ONU RX power distribution
Fleet-wide received power buckets (dBm)
-27
-24
-18
2
0
0
0
0
2
3
6
13
18
15
21
21
13
8
3
0
−31 dBm−27−24−18−15 dBm
Optical Budget Calculator
GPON Class B+ link budget — plan a new drop before splicing
OLT TX power (dBm)+3.0
Fiber length (km)8.0
Splitter ratio1:32 · 17.8 dB
Connectors (0.3 dB each)3
Splices (0.1 dB each)4
Safety margin (dB)3.0
Expected RX @ ONU
LINK OK — healthy margin-17.8dBm
ONU sensitivity −28 dBm (Class B+)
Fiber loss−1.68 dB
Splitter loss−17.8 dB
Connector loss−0.9 dB
Splice loss−0.4 dB
Total link loss−20.78 dB
3.0 − 1.68 − 17.8 − 0.9 − 0.4 = -17.8 dBm