... | ... | @@ -42,12 +42,23 @@ FMC](https://www.ohwr.org/project/fmc-dio-5chttla/wiki) to be plugged |
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onto a [SPEC](https://www.ohwr.org/project/spec/wiki) board). When the
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electrical phase plane of the PPS signal is defined on such an
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exchangeable module and future exchange is foreseen then separate
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calibration of each of these parts is necessary.
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Both, calibration procedures for EO/OE converters and exchangeable
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modules, are outside the scope of this wiki page. However, it should be
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noted that EO/OE converters and exchangeable modules should store their
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calibration parameters in EPROM such that the system can automatically
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reach absolute calibration during link initialization.
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calibration of each of these parts is necessary. The calibration
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parameters for EO/OE converters and exchangeable modules are stored in
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EPROM such that the system can automatically reach absolute calibration
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during link initialization.
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Last but not least, there is an asymmetry (WR alpha factor) between
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forward and backward propagation delay over the fiber due to chromatic
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dispersion. This can be measured and monitored in-situ.
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#### To conclude:
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Calibration of WR devices is spans three main calibration topics, each
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described on the following wiki pages:
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- [Absolute
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calibration](https://www.ohwr.org/project/wr-calibration/wiki/absolute-calibration)
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- Electrical-Optical / Optical Electrical
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- In-situ determination of alpha
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### **Principle**
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... | ... | @@ -131,10 +142,14 @@ Visser](https://www.ohwr.org/users/1975) |
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<td>22-07-16</td>
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<td>added description of White Rabbit Absolute Calibration Procedure</td>
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</tr>
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<tr class="even">
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<td>17-07-17</td>
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<td>divided calibration into three topics each described in sub-wiki pages</td>
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</tr>
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</tbody>
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</table>
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-----
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Last updated: 12 Nov 2016
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Last updated: 17 Jul 2017
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