Reference; Verification Of The Optical Budget; Optical Budget Calculation For Serial Communication With Lon - ABB REB 551-C3*2.5 Installation And Commissioning Manual

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1.1
1.1.1
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Reference

Reference
We refere to document: LNT 505 Operator's Manual 1MRS751706-MUM, Issued: 31.10.99,
Program rev: 1.1.1 Doc. version: B.

Verification of the optical budget

Optical budget calculation for serial communication with LON

Table 7: Example
Maximum attenuation for REx 5xx
4 dB/km multi mode: 820 nm - 62.5/125 um
0.2 dB/m plastic: 620 nm - 1mm
Margins for installation, aging etc.
Losses in connection box, two contacts (0.7 dB/contact)
Losses in connection box, two contacts (1dB/contact)
Margin for repair splices (0.5 dB/splice)
Maximum total attenuation
Establishing connection and
verifying the LON communication
Distance 1 km Distance 20 m
Glass Plastic
-11 dB - 7 dB
4 dB -
- 4 dB
5 dB 1 dB
1.4 dB -
- 2 dB
0.5 dB -
11 dB 7 dB
Chapter 12