
Active Components and Topologies
6-20
SIMATIC NET Tw isted-Pair and Fiber-Optic Networks
C79000-G8976-C125-02
6.2.7 Redundant Linking of Subnets Using the OSM/ESM
Structure of a Redundant Link
Using an OSM/ESM, fast, redundant links between two Ethernet subnets or
networks can be implemented. These networks can, for example, consist of
redundant OSM/ESM rings.
The redundant link as shown in Figure 6-12 is established on separate paths via
the two TP ports (port 1) of an OSM/ESM pair. The standby-sync ports of both
OSMs/ESMs must be connected using an ITP XP standard cable 9/9 with a
maximum length of 40 m.
1. ITP XP standard cable 9/9
OLM
OLM
OLM
1
1
2
2
2. Fiber-optic cable (FO)
Redundant paths
OSM ITP 62
OSM ITP 62 OSM ITP 62
Synchronization cable
222
2
2
2
1
Standby master Standby slave
Figure 6-12 Redundant Link Between Two Networks or Network Segments
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