Pilz PSSnet SHL 8T MRP - Manual (Page 98)

Synchronizing the system time in the
network
PSSnet SHL - Basic Configuration
Pilz GmbH & Co. KG, Felix- Wankel Str. 2, 73760 Ostfildern
7.3 Precision Time Protocol
99
Figure 27: Delay and jitter problems when synchronizing clocks
Independently of the physical communication paths, the PTP provides logical
communication paths which you define by setting up PTP subdomains.
Subdomains are used to form groups of clocks that are time-independent
from the rest of the domain. Typically, the clocks in a group use the same
communication paths as other clocks.
PTP
Reference
(Master clock)
UDP
IP
MAC
Phy
PTP
UDP
IP
MAC
Phy
Local
(Slave clock)
LAN
PTP Precision Time Protocol (Application Layer)
UDP User Datagramm Protocol (Transport Layer)
IP
Internet Protocol (Network Layer)
MAC Media Access Control
Phy Physical Layer
Delay + Jitter
Delay + Jitter Delay + Jitter