... | @@ -13,14 +13,29 @@ |
... | @@ -13,14 +13,29 @@ |
|
full calibration procedure for your WR hardware.
|
|
full calibration procedure for your WR hardware.
|
|
- [WR Calibration Procedure](https://www.ohwr.org/project/white-rabbit/wikis/Documents/White-Rabbit-calibration-procedure)
|
|
- [WR Calibration Procedure](https://www.ohwr.org/project/white-rabbit/wikis/Documents/White-Rabbit-calibration-procedure)
|
|
|
|
|
|
|
|
|
|
-----
|
|
-----
|
|
|
|
|
|
## Absolute calibration
|
|
## Absolute calibration
|
|
|
|
|
|
|
|
Absolute calibration is achieved by measuring the time relationship (Δ
|
|
|
|
<sub>TXcal</sub>, Δ <sub>RXcal</sub>) between the external electrical
|
|
|
|
phase planes of the PPS signal and the interface to the
|
|
|
|
Electrical-Optical / Optical-Electrical converter (EO/OE, usually the
|
|
|
|
electrical SFP connector) as shown in Figure 1. Note that EO/OE
|
|
|
|
converters have their own calibration parameters that define the
|
|
|
|
relationship between their electrical and optical phase planes.
|
|
|
|
Calibration of EO/OE converters is not covered on this wiki
|
|
|
|
page.
|
|
|
|
|
|
![](/uploads/5ce29cb41174ccb1272012afd9dbc6bc/link-model-abs-cal.png)
|
|
![](/uploads/5ce29cb41174ccb1272012afd9dbc6bc/link-model-abs-cal.png)
|
|
*Figure1: White Rabbit link delay model for absolute calibration**
|
|
*Figure1: White Rabbit link delay model for absolute calibration**
|
|
|
|
|
|
|
|
Absolute calibration enables independent developers and/or vendors to
|
|
|
|
exchange their WR gear while achieving sub ns timing synchronisation.
|
|
|
|
Absolute calibrated devices can be used as "golden standards" for the
|
|
|
|
[relative calibration
|
|
|
|
procedure](https://www.ohwr.org/project/white-rabbit/wikis/Calibration).
|
|
|
|
|
|
- [WR calibration - ASTERICS -
|
|
- [WR calibration - ASTERICS -
|
|
Nikhef](https://redmine.nikhef.nl/et/project/wr_cal/wiki)
|
|
Nikhef](https://redmine.nikhef.nl/et/project/wr_cal/wiki)
|
|
- Aims to provide a method of absolute calibration of all elements
|
|
- Aims to provide a method of absolute calibration of all elements
|
... | | ... | |