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| RFO485- XX | -11 | -22 | -33 | -44 |
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| Multimode fibre optics | • | • | ||
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| Monomode fibre optics | • | • | ||
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| 800 nm optical source | • | |||
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| 1300 nm optical source | • | • | • | |
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| Minimum optical budget at 25 °C (dB) | 12 | 12 | 16 | 10 |
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| RS232 - RS485 - RS422 | • | • | • | • |
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| Alarm contact | • | • | • | • |
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| Double DC power supply | • | • | • | • |
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