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User Guide
234
The procedure to display the delay statistics associated to PTP messages is as follows:
Table 9.7: IEEE 1588 Delay Statistics
Result Description
Sync PTD (current) Last calculated value of the Packet Total Delay (PTD) experi-
enced by IEEE 1588 Sync messages when they travel from
the master to the test unit (with end-to-end delay mecha-
nism) or from the peer entity to the slave (with peer-to-peer
delay mechanism). The result is expressed in microseconds.
The Sync PTD (current) metric is compensated in delay
which means that corrections carried out by intermediate
IEEE 1588 transparent clocks are taken into account to com-
pute the end result.
This result is available only if the equipment is operating in
Slave emulation mode or in Test mode.
Sync PTD (minimum) Minimum value of Sync PTD (current) registered from the
beginning of the test.
This result is available if the equipment is operating in slave
emulation mode or in test mode.
Sync PTD (maximum) Maximum value of Sync PTD (current) registered from the
beginning of the test.
This result is available if the equipment is operating in slave
emulation mode or in test mode.
Sync PTD (average) Mean value of the PTD computed over all Sync messages
received from the beginning of the test and expressed in
microseconds.
This result is available if the equipment is operating in slave
emulation mode or in test mode.
Sync PTD (std. dev.) Standard deviation of the PTD computed over all Sync mes-
sages received from the beginning of the test.
Note that even if it is an statistic corresponding to the PTD,
the standard deviation is a quantity related with how the PTD
varies over the collected samples. In fact, the Sync PTD (std.
dev.) does not depend on the absolute delay from the master
and it is computed in slave emulation, pseudo-slave emula-
tion (Test mo de) and passive monitoring modes.
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