Optical Budget Calculation For Serial Communication With Spa/Iec - ABB RET670 Installation And Commissioning Manual

Section 9
Establishing connection and verifying the SPA/IEC- communication
9.4
92
Optical budget calculation for serial communication
with SPA/IEC
Table 12: Example
Maximum attenuation
4 dB/km multi mode: 820 nm - 62.5/125 um
0.16 dB/m plastic: 620 nm - 1mm
Margins for installation, aging, and so on
Losses in connection box, two contacts (0.5 dB/contact)
Losses in connection box, two contacts (1 dB/contact)
Margin for 2 repair splices (0.5 dB/splice)
Maximum total attenuation
1MRK 504 088-UEN C
Distance 1 km Distance 25 m
Glass Plastic
- 11 dB - 7 dB
4 dB -
- 4 dB
5 dB 1 dB
1 dB -
- 2 dB
1 dB -
11 dB 7 dB
Installation and commissioning manual