Introduction
1.4 Cabling Recommendations
1.4
Cabling Recommendations
All copper Ethernet ports on RUGGEDCOM products include transient suppression
circuitry to protect against damage from electrical transients and conform with
IEC 61850-3 and IEEE 1613 Class 1 standards. This means that during a transient
electrical event, communications errors or interruptions may occur, but recovery is
automatic.
Siemens does not recommend using copper Ethernet ports to interface with devices
in the field across distances that could produce high levels of ground potential rise
(i.e. greater than 2500 V), during line-to-ground fault conditions.
1.5
High Availability Seamless Ring Operation
Parallel Redundancy Protocol (PRP) and High-availability Seamless Redundancy (HSR)
are two mechanisms defined by the IEC 62439-3 standard to provide hitless network
recovery. Unlike Spanning Tree Protocol (STP), which requires reconfiguration of the
active network topology over redundant physical links, HSR and PRP provide hitless
network recovery through the use of information replication.
1.5.1
Parallel Redundancy Protocol
Parallel Redundancy Protocol (PRP) provides hitless network recovery by replicating
information over two physically independent Ethernet networks. The following
illustrates a typical PRP network:
5
2
3
4
1
7
6
2
1
Sending IED
2
RUGGEDCOM RS950G
3
Network A
4
Network B
5
RS900
4
RUGGEDCOM RS950G
Installation Manual, 01/2021, C79000-G8976-1037-06
