CM CAN Combo
User Manual
53
Figure 4-33: 802.1AS PTP bridge
The time-synchronization information contained on the Sync and Follow Up messages
sent by the „Time
-aware system i-
1“
is redirected and received CaptureModule.
These packets are decoded, and the relevant information extracted. The extracted
information is used later to generate, together with the information extracted from the
propagation delay algorithm, the new corrected Sync and Follow Up messages that will
be sent to the
„Time
-aware system
i+1“.
In the new generated packets, a field called
“
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“.
4.8.2
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