CM Eth Combo
User Manual
45
“
correction field
” will be changed and this parameter will be used on
reception side to
adjust the reference time of the system considering the delay of the switch and the
delay in
the path „Time
-aware system i-
1“ to „Time
-aware system
i“.
4.6.2
Propagation delay measurement
For the correction adjust of the time reference transmitted by the Sync and Follow Up
Packets, the
delay between the initiator of the protocol „Time
-aware system i-
1“ and
the first slave port of CaptureModule
„Time
-
aware system i“, should be
measured
Figure 4-25: P-Delay
The measures of the propagation delay are performed by each attached link of an
802.1as communication, it means each side of the link will generate and response to
these packets, called:
•
Pdelay_Request,
•
Pdelay_Response and
•
Pdelay_Response_Follow_Up.