9.4
Optical budget calculation for serial communication
with SPA/IEC
Table 12:
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
Section 9
1MRK 504 088-UEN C
Establishing connection and verifying the SPA/IEC- communication
92
Installation and commissioning manual
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