ABB Relion 670 series - Optical Budget Calculation for Serial Communication with LON

13.2 Optical budget calculation for serial communication
with LON
Table 27: Example
Distance 1 km
Glass
Distance10 m
Plastic
Maximum attenuation -11 dB - 7 dB
4 dB/km multi mode: 820 nm - 62.5/125 um 4 dB -
0.3 dB/m plastic: 620 nm - 1mm - 3 dB
Margins for installation, aging, and so on 5 dB 2 dB
Losses in connection box, two contacts (0.75 dB/contact) 1.5 dB -
Losses in connection box, two contacts (1dB/contact) - 2 dB
Margin for repair splices (0.5 dB/splice) 0.5 dB -
Maximum total attenuation 11 dB 7 dB
1MRK 502 029-UEN A Section 13
Establishing connection and verifying the LON communication
143
Installation and commissioning manual