58
Optical budget calculation for serial
communication with SPA/IEC
Chapter 8
Establishing connection and
verifying the
4 Optical budget calculation for serial
communication with SPA/IEC
Table 8: Example
Distance 1 km
Glass
Distance 25 m
Plastic
Maximum attenuation for IED670 - 11 dB - 7 dB
4 dB/km multi mode: 820 nm - 62.5/125 um 4 dB -
0.16 dB/m plastic: 620 nm - 1mm - 4 dB
Margins for installation, aging etc. 5 dB 1 dB
Losses in connection box, two contacts (0.5 dB/contact) 1 dB -
Losses in connection box, two contacts (1 dB/contact) - 2 dB
Margin for 2 repair splices (0.5 dB/splice) 1 dB -
Maximum total attenuation 11 dB 7 dB
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