IEEE 1588 Analysis
237
Asymmetry (current) This result is computed as the difference of the Sync PTD
(current) and Delay req. PTD (current). Delay asymmetry
may cause a wrong time estimates in PTP slave clocks and
for this reason this parameter has to be carefully controlled
in PTP roll-outs for phase and time applications.
This metric is computed both in slave emulation mode and in
test mode.
Asymmetry
(minimum)
This result is computed as the difference of the Sync PTD
(minimum) and Delay req. PTD (minimum).
This metric is computed both in slave emulation mode and in
test mode.
Asymmetry
(maximum)
This result is computed as the difference of the Sync PTD
(maximum) and Delay req. PTD (maximum).
This metric is computed both in slave emulation mode and in
test mode.
Asymmetry (average) This result is computed as the difference of the Sync PTD
(average) and Delay req. PTD (average).
This metric is computed both in slave emulation mode and in
test mode.
Sync IAD
(current)
Current Inter Arrival Delay (IAD) computed over the Sync
packets received from a remote IEEE 1588 master clock.
The Sync IAD is defined as the delay between two consecu-
tively received IEEE 1588 Sync packets.
The Sync IAD (current) metric is computed in slave emula-
tion, pseudo-slave emulation (test mode) and passive moni-
tor modes.
Sync IAD
(average)
Mean value of the Sync IAD computed over all Sync mes-
sages received from the beginning of the test and expressed
in microseconds.
The Sync IAD (average) metric is computed in slave emula-
tion, pseudo-slave emulation (test mode) and passive moni-
tor modes.
Table 9.7: IEEE 1588 Delay Statistics
Result Description
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