Knowing the propagation delays of 1pps signals passing through the Option 133 1pps/ToD/Frequency Converter is critical when setting the Paragon-Neo 1pps reference and measurement compensation values.
To minimise the effect of device-to-device variationvariation between individual converters, users can measure the propagation delays of their a specific Option 133 converters converter using the test sequence described here. The yellow dots in picture below shows the location of 1pps propagation delays in the Rev C and Rev D Option 133 Converter.
KG note – intention is to focus on 1pps propagation delay measurement and not mention ToD delays. OK ?
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The functionality of the 1pps paths between ports is given in the table below.
Input Port | Output Port | Notes | ||
Port 1 Balanced 1pps | ||||
In | RJ45 pins 3 |
+6 | Port 2 |
Unbalanced 1pps |
Out | RJ45 pins 1 |
+2 |
Port 1 Balanced 1pps |
In | RJ45 pins 3 |
+6 | Port 7 |
Unbalanced 1pps |
Out | BNC | Rev D only |
Port 3 |
Unbalanced 1pps |
In | RJ45 pins 1 |
+2 | Port 4 Balanced 1pps |
Out | RJ45 pins 3 |
+6 |
|
Port 3 |
Unlalanced 1pps |
In | RJ45 pins 1 |
+2 | Port 7 |
Unbalanced 1pps |
Out | BNC | Rev C only |
Measuring the propagation delay between two ports of the Option 133 Converter is done using the Paragon-neo 1pps Time Error Measurement function. Connect the two ports that you want to measure the propagation between one of the Paragon-neo 1pps Reference Output ports (RJ45 or BNC) and one of the 1pps Measurement ports (RJ45 or BNC).
An example connection is shown below for measuring the Option 133 Converter port 3 to port 4 propagation delay. All cables must be kept as short as possible and the length of the cables must be measured precisely.
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