Managed
Ethernet switch
IEC 61850
PRP
Managed
Ethernet switch
Primary
IEEE 1588 v2
master clock
Secondary
IEEE 1588 v2
master clock
(optional)
Backup
IEEE 1588 v2
master clock
SMV traffic
GUID-424C4FFA-A4A6-463D-BFFE-3117E5AE55C8 V3 EN
Figure 40: Recommended PRP reference topology with SMV and IEEE 1588 v2
6.2.3 Performance optimization
• The SMV messages should be filtered out from the local subnetwork part not
using these, because they cause high traffic in the network. Otherwise they reach
also those network devices that do not subscribe the SMV messages. Managed
Ethernet switches can be configured to perform the filtering operation.
• IEEE 1588 v2 network devices complying with Power Profile are highly
recommended to simplify the settings and to ensure compatibility. Power Profile
and HSR standard recommend implementation according to the one-step mode.
• It is recommended to use IEEE 1588 v2 devices with the same clock mode (one-
step or two-step) within one network. Ethernet switches performing one-step to
two-step conversions should be avoided due to additional inaccuracy.
• One SMV publisher generates around 5 Mbit/s traffic to the network. This is
about 5% of bandwidth in PRP and 10% in HSR when the bandwidth of the used
network is 100 Mb/s.
6.2.4 Requirements for third party devices
System and setting requirements
Section 6 1MRS757809 C
Process bus and IEEE 1588 time synchronization
64 REC615 and RER615
Engineering Guide
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