100BASE-T1 SPY 12 Port
User Manual
49
5.2.1
PTP of 802.1 AS Protocol
In an 802.1AS topology, the com-
munication between a Master and a
Slave Node is as you can see in the
picture to the right.
For a generic time t
x
, the Slave device can
correct this time as follows:
tx‘ (ns) = tx + t1 + t2 + ∆t
- Path Delay
With t3, t4, t5 and t6, the slave device can
calculate the Path Delay as follows:
𝑃𝑎𝑡ℎ𝐷𝑒𝑙𝑎𝑦 (𝑛𝑠) =
(𝑡6 − 𝑡3) − (𝑡5 − 𝑡4)
2
Figure 5-3: Timing PTP
