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White Rabbit Starting Kit
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White Rabbit Starting Kit
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845f589d
Commit
845f589d
authored
Dec 17, 2019
by
Miguel Jimenez Lopez
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Add note about RTT, FW and BW delays in the stamp-frame tool section.
Update stamp-frame test results.
parent
013a557a
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doc/wr-starting-kit.md
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845f589d
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@@ -1166,13 +1166,13 @@ few seconds; the
differences:
~~~
~~{.sh}
timestamp T1:
13.225
249168
timestamp T2:
9.13023
7600
timestamp T3:
9.14043
8816
timestamp T4:
13.235559016
round trip time: 0.0001
08632
forward time:
-5.904988432
backward time:
4.095120200
timestamp T1:
40.229
249168
timestamp T2:
25.34044
7600
timestamp T3:
25.34046
8816
timestamp T4:
40.229469040
round trip time: 0.0001
98656
forward time:
-14.888801568
backward time:
14.889000224
~~~
~~~~~~~~~
The code in
`stamp-frame`
...
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@@ -1186,7 +1186,11 @@ send another message which carries the departure time of the previous
frame. This further message is usually called
*follow-up*
,
and
`stamp-frame`
respects this tradition.
> ***Note:*** Round trip time (RTT) is calculated with formula RTT = (T4-T1)-(T3-T2),
> Forward (FW) and Backward delays (BW) are computed using FW = T2-T1 and BW =
> T4-T3 formulas respectively. In unsynchronized scenarios FW and BW delays
> could present opposite signs because of the subtraction of timestamps from different
> devices whose time bases are unrelated.
Forwarding train of pulses
...
...
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