Table 9:
Max distances between IEDs/nodes
glass
< 1000 m according to optical budget
plastic
< 25 m (inside cubicle) according to optical budget
8.4
Optical budget calculation for serial communication
with SPA/IEC
M11736-4 v2
Table 10: Example
Distance 1 km
Glass
Distance 25 m
Plastic
Maximum attenuation
- 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, and so on
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
1MRK 502 067-UEN B
Section 8
Establishing connection and verifying the SPA/IEC communication
77
Commissioning manual
