Optical Budget Calculation For Serial Communication With Lon - Hitachi Relion RES670 Commissioning Manual

1MRK 511 409-UUS Rev. K
7.2 Optical budget calculation for serial communication with
LON
Table 11:
Maximum attenuation
4 dB/km multi mode: 820 nm - 62.5/125 um
0.3 dB/m plastic: 620 nm - 1mm
Margins for installation, aging, and so on
Losses in connection box, two contacts (0.75 dB/contact)
Losses in connection box, two contacts (1dB/contact)
Margin for repair splices (0.5 dB/splice)
Maximum total attenuation
Phasor measurement unit RES670
Commissioning manual
Example
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Establishing connection and verifying the LON communication
Distance 1 km Distance10 m
Glass Plastic
-11 dB - 7 dB
4 dB -
- 3 dB
5 dB 2 dB
1.5 dB -
- 2 dB
0.5 dB -
11 dB 7 dB
Section 7
M11737-4 v2
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